METHOD FOR MODIFYING THE GINGIVAL PART OF A VIRTUAL MODEL OF A SET OF TEETH

专利摘要:
method to modify the gingival part of a virtual model of a set of teeth. The present invention relates to a method for generating and modifying a virtual model of a set of teeth, wherein the method ensures that a restoration can be inserted into a physical model of the set of teeth manufactured from the virtual model of the set. of teeth.
公开号:BR112013021378B1
申请号:R112013021378-7
申请日:2012-02-23
公开日:2021-06-15
发明作者:Rune Fisker；Sven Nonboe
申请人:3Shape A/S；
IPC主号:

专利说明:

[0001] The present invention relates to a method and a system to generate a virtual model of a set of teeth to manufacture a physical model of the set of teeth, and a physical model of a set of teeth.
[0002] The invention can be used, for example, in relation to dental implants and other applications where a restoration is to be inserted into a gingival part of a physical model of the set of teeth.
[0003] When designing a dental restoration for a patient, an orthodontic technician often uses a physical model of the patient's set of teeth. In many cases it is preferred that the engineered restoration, such as a fixation abutment and the corresponding crown or bridge, be formed so that it smoothly displaces a portion of the patient's gums. When a physical model of the patient's set of teeth is made in a material that is not easily displaced / deformed by the orthodontist, this design of the restoration will result in the restoration cannot be inserted into the physical model of the patient's set of teeth. .
[0004] A method for generating and modifying a virtual model of a set of teeth is disclosed, wherein said set of teeth comprises a region configured for insertion of a restoration, wherein the region is located in a gingival part of the set of teeth , where the method comprises: - obtaining at least a three-dimensional representation of the set of teeth; - generating a virtual model of the set of teeth from said three-dimensional representation, where the virtual model of the set of teeth comprises a gingival part, in which the said gingival part comprises a virtual region corresponding to said region configured for insertion of a restoration and at least part of the gingiva surrounds said region; obtaining a virtual model of said restoration; and - modify the gingival part of the virtual model of the set of teeth so that the virtual model of the restoration can be inserted virtually within said virtual region with no overlap between the volume of said virtual model of the restoration and the volume of said gingival part of the virtual model of set of teeth.
[0005] At least a part of the gingival part of the virtual model of the set of teeth can correspond to the gingival part of the set of teeth of the patient.
[0006] A method for generating a virtual model of a set of teeth to fabricate a physical model of the set of teeth is disclosed, where the method comprises: - obtaining a three-dimensional representation of the set of teeth; - obtaining a virtual model of a restoration, where at least a subgingival portion of the virtual model of the restoration is configured to take the form of an anatomically correct restoration; and - generate a virtual model of the set of teeth from said three-dimensional representation, in which the virtual model of the set of teeth comprises a gingival part, where the gingival part comprises a gingiva and a region configured for insertion of a restoration, and where the gingival portion is configured to ensure that when the restoration is inserted into that region, the volume of the restoration and the volume of the gingival portion do not overlap.
[0007] In the context of the present invention, the term "subgingival part of" used in relation to the restoration may refer to the part of the restoration that lies below the gingival surface when the restoration is inserted into the virtual or physical model of the set of teeth. The subgingival portion may be the portion of the restoration that lies below the margin line when the restoration is inserted into the gingival portion of the tooth set model.
[0008] The subgingival part of the restoration can take different shapes. In some embodiments, the subgingival portion of a restoration has a transverse dimension that changes along the longitudinal direction of the restoration. The transverse dimension of the subgingival portion of the restoration may increase towards a margin line of the restoration so that the diameter of the restoration at the margin line is larger than the diameter further below the surface of the gingival portion. The transverse dimension can be the diameter or area of the restoration in a transverse plane that can be perpendicular to the insertion direction of the restoration.
[0009] The method can generally refer to a gingival portion that is configured to ensure that when a restoration is inserted into a region of the gingival portion, the volume of the restoration and the volume of the gingival portion do not overlap.
[00010] The virtual restore model can comprise the entire restore or a portion of the restore.
[00011] In some modalities, the gingival part of the virtual model generated directly from the three-dimensional representation ensures that the volume of the restoration and the volume of the gingival part do not overlap. This can be the case, for example, when the method ensures that the gingival part is configured for insertion of the restoration in the same step as the virtual model is generated from the three-dimensional representation. In some modalities, the virtual model of the set of teeth is generated in one step and where the gingival part of the virtual model is subsequently modified to ensure that the volume of the restoration and the volume of the gingival part do not overlap. This can be the case, for example, when the method guarantees that the gingival part is configured for insertion of the restoration after the virtual model is generated from the three-dimensional representation.
[00012] In some embodiments, the gingival part of the virtual set of teeth model is modified to ensure that the contiguous surfaces of the virtual model of the restoration and the gingival part of the virtual set of teeth model follow each other.
[00013] In some embodiments, a displacement is provided between the contiguous surfaces of the virtual model of the restoration and the gingival part of the virtual model of the set of teeth. The displacement may be substantially uniform over a portion of said subgingival portion of the restoration.
[00014] In the context of the present invention, the term "contiguous surfaces" can be used in relation to virtual surfaces that are contiguous, for example, when the virtual model of the restoration is arranged in its correct anatomical position relative to the virtual model of the set of teeth. The expression can also be used in relation to the surfaces of a restoration formed from the virtual model of the restoration when the restoration is laid out on a physical model of the set of teeth.
[00015] In some modalities, modifying the gingival part of the virtual model of the set of teeth comprises digitally cutting a part of the gingiva so that the volume of the restoration and the volume of the gingiva do not overlap. The digital cut can correspond to a removal of material from a physical model of the set of teeth. Preferably, the digital cut is made with the virtual model of the restoration virtually disposed on the gingival part of the virtual model of the set of teeth.
[00016] An advantage that can be provided by the present invention is the possibility of digitally combining a restoration with a gingival part of a virtual model of a set of teeth, where the anatomically correct shape of the restoration is taken into account.
[00017] An advantage that can be provided by the present invention is that an anatomically correct restoration can be inserted into a physical model fabricated from a virtual model of the set of teeth generated using the method according to the present invention. The restoration can be arranged in its anatomically correct position and in anatomically correct orientation relative to the gingival portion and any bordering teeth on the model. This can allow, for example, an orthodontic technician to test the shape and arrangement of the actual restoration on a physical model of the set of teeth.
[00018] A method for generating and modifying a virtual model of a set of teeth to manufacture a physical model of the set of teeth is disclosed, where the method comprises: - obtaining a three-dimensional representation of the set of teeth; - generating a virtual model of the set of teeth from said three-dimensional representation, wherein the virtual model of the set of teeth comprises a gingival part comprising a gingiva; and - modify the gingival part to allow insertion of a restoration in a region of the virtual model configured for insertion of a restoration.
[00019] A method for generating a virtual model of a set of teeth to fabricate a physical model of the set of teeth is disclosed, where the method comprises:- obtaining a virtual model of the set of teeth, wherein the model comprises a gingival part which comprises a gum; e- obtain a virtual model of a restoration configured to be placed in its correct anatomical position relative to said gingival part of the model; where the gingival surface defines a first surface on said restoration; and modifying the gingiva on said restoration so that the surface of the gingiva modification defines a second surface on said restoration, wherein the second surface is configured to avoid an overlap between the volume of the restoration and the volume of the gingival portion of the model.
[00020] A method for adjusting a virtual model of a set of teeth is disclosed, where the virtual model of the set of teeth serves to fabricate a physical model of the set of teeth, where the method comprises:- obtaining a preset configuration a virtual model of the set of teeth, wherein the virtual model of the set of teeth comprises a gingival portion; e- obtain a virtual model of a restoration configured to be arranged in its correct anatomical position relative to said gingival part of the model, where the volume of the gingival part of the virtual model of the set of teeth and the volume of the restoration overlap when the restoration is arranged in the correct anatomical position; e- adjust a part of the gingival part of the virtual set of teeth model disposed in said restoration by providing a post-fit configuration of the virtual model of the set of teeth, wherein the post-fit setting of the gingival part of the model is configured to avoid overlapping between the volume of the virtual model of the restoration and the volume of the gingival part of the model of the set of teeth.
[00021] A method for adjusting a virtual model of a set of teeth is disclosed, where the virtual model serves to manufacture a physical model of the set of teeth, where the method comprises:- obtaining a preset configuration of a virtual model of the set of teeth, in which the model comprises a gingival part; e- adjust a part of the gingival part of the model disposed in said restoration providing a post-fit configuration of the virtual model of the set of teeth, in which the post-fit configuration of the gingival part of the model is configured to avoid overlapping between the volume of a restoration configured to be placed in its correct anatomical position on the gingival part of the model.
[00022] In some modalities, the adjustment of the gingival part comprises configuring the shape of the gingival part so that the overlap between the volumes is avoided.
[00023] In some embodiments, the method comprises configuring the gingival material in the restoration to be soft enough so that a restoration can deform the gingival portion. This can be done by removing relatively harder material from a physical model of the set of teeth and replacing it with a relatively softer material, such as replacing plaster with a silicone dental material.
[00024] A method for generating a physical model of a set of teeth is disclosed, where the method comprises:- obtaining at least a three-dimensional representation of the set of teeth; - generating and modifying a virtual model of the set of teeth of said at least one three-dimensional representation, wherein the virtual model of the set of teeth comprises a gingival part; and - modifying the gingival portion to allow insertion of a restoration in a region of the virtual model of the set of teeth configured for insertion of a restoration. - manufacturing said physical model of said virtual model of the set of teeth.
[00025] In some modalities, the method comprises configuring the gingival part to avoid an overlap with a restoration when the restoration is inserted into the model. This overlap can make it difficult or even impossible to accommodate the restoration in its correct anatomical position on the gingival part of the model.
[00026] A physical model of a set of teeth is disclosed, in which the physical model is manufactured from a virtual model generated by the method according to the present invention.
[00027] In the context of the present invention, the expression "the restoration" can refer to a complete dental restoration or a part of a restoration, such as a fixation abutment or a crown disposed on said fixation abutment. A fixture post can be a custom fixture post or a standard fixture post.
[00028] At least one step of the method is computer-implemented. In some modalities at least the generation and modification of the virtual model of the set of teeth are implemented by computer.
[00029] In some embodiments, a first three-dimensional representation of the set of teeth is obtained by scanning the set of teeth of the patient with a scanning body disposed in said region of the implant. Data related to the scanbody can therefore be part of the virtual model of the set of teeth.
[00030] In some embodiments, said virtual model of the set of teeth is generated at least in part of said first three-dimensional representation. The virtual model of the set of teeth can therefore comprise a section that corresponds to the gingival part of the set of teeth.
[00031] In some embodiments, a second three-dimensional representation of the set of teeth is obtained by scanning the set of teeth of the patient with the emergence profile in said region of the implant being visible. In this case, data related to gingiva emergence can be derived or become part of a virtual model of the set of teeth.
[00032] In some embodiments, said virtual model of the set of teeth is generated at least in part from said second three-dimensional representation. The virtual model of the set of teeth can then comprise a section that corresponds to the gingival part.
[00033] In some embodiments, one of said first or second three-dimensional representations of the set of teeth is obtained by sweeping a relatively larger section of the patient's set of teeth, and the other of said first or second three-dimensional representations is then obtained by sweeping a relatively larger section smaller around the implant region.
[00034] In some embodiments, the method comprises generating a first virtual model of the set of teeth from said first three-dimensional representation of the set of teeth.
[00035] In some modalities, the method comprises generating a second virtual model of the set of teeth from said second three-dimensional representation of the set of teeth. In some embodiments, the method comprises combining first and second virtual models of the set of teeth to generate said virtual model of the set of teeth. This virtual model of the set of teeth can then comprise both the emergence profile and data related to the position and orientation of the implant.
[00036] In some embodiments, a virtual scanbody model is provided and virtually aligned with the first virtual toothset model to determine implant orientation and position.
[00037] In some modalities, the restoration is designed based on the virtual model of the set of teeth.
[00038] In some embodiments, the restoration is a prefabricated restoration such as a prefabricated fixation abutment.
[00039] In some modalities, the modified virtual model of the set of teeth serves to manufacture a physical model of the set of teeth.
[00040] In some embodiments, at least a subgingival portion of the virtual model of the restoration is configured to take the form of an anatomically correct restoration.
[00041] The virtual model region configured for insertion of a restoration may comprise a region of the gingival portion configured to comprise an implant analog, an orifice, a healing abutment, a scan body or in principle any dental indication. The region may be bounded by a surface of the gingiva area that has a circumference that is partially bounded by the nearest bordering teeth.
[00042] In some embodiments, the method comprises configuring the gingiva mask to comprise an opening, where the opening is configured to allow a restoration to access the gingival portion disposed below the gingiva mask.
[00043] In some modalities, a virtual hole is provided in said gingival part of the virtual model of the set of teeth.
[00044] The virtual hole can be such that a corresponding hole in the physical model of the set of teeth is configured to match a part of said restoration configured to fit in the gingival part of the physical model of the set of teeth. The virtual hole can be configured to allow an implant analog to be manually inserted into the corresponding hole in the physical model of the tooth set.
[00045] The virtual hole and / or said implant analog can be configured so that said implant analog can be inserted only in the correct anatomical position and orientation in the gingival part of the model.
[00046] The opening of the gingiva mask can be aligned with an implant analog disposed in the gingival part below the gingival mask.
[00047] In some embodiments, the implant analog is configured to have a shape with reduced transverse rotation symmetry, such as an N-order symmetry, where N is an integer below 25.
[00048] The implant analog may not have rotation symmetry in its transverse plane.
[00049] In some embodiments, the gingival portion of the virtual tooth set model is configured to ensure that a corresponding ejection hole in the physical tooth set model is in fluid connection with said hole so that a restoration or an analog of the implant can be accessed through said ejection orifice to be ejected from the gingival part of the physical model of the set of teeth.
[00050] In some embodiments, the implant analog is configured to comprise a stop section with a smaller cross-sectional area at its distal end, wherein said stop section is preferably arranged centrally around the longitudinal axis of the implant analog.
[00051] In some embodiments, the implant analog is configured to comprise a stop surface at its distal end, wherein said stop surface is preferably arranged centrally around the longitudinal axis of the implant analog.
[00052] In some embodiments, the stop surface is reduced in size/diameter compared to other parts of the implant analog to ensure that space is provided for rounded corners of the orifice sidewall.
[00053] The virtual hole defined in the gingival portion of the teeth set virtual model can be configured to ensure that the corresponding hole in the teeth set physical model has rounded edges at its distal end or at any twist along the longitudinal direction of the hole.
[00054] In some embodiments, a height inspection groove is defined on the implant analog to allow a visual or contact based inspection of whether the implant analog is disposed in the correct position on the gingival part of the model.
[00055] The height inspection groove can extend around the entire circumference of the implant analog forming a band-shaped height inspection groove that can be seen from all directions in a transverse plane that crosses the inspection groove tall.
[00056] A window or a hollow hole can be provided in the gingival portion to allow visual and/or physical contact to the implant analog on the outside of the model. The window or hollow hole can be provided in the virtual model or after the fabrication of the physical model.
[00057] In the context of the present invention, the expression "below" is used only to describe the relative orientation of the parts of the model and does not represent a limitation on which part is closer to the base than the other parts. One part being below another part can be used to describe an arrangement of parts relative to the plane of occlusion of a set of teeth.
[00058] The expression "below" can be used to describe that a subgingival part of a virtual model of a restoration is placed behind the surface of the gingival part relative to a viewpoint situated in a position that corresponds to the center of the patient's mouth. . That is, in the patient's mouth the object that is placed below the surface of the gingival part of the set of teeth may not be visible.
[00059] In the context of the present invention, the expressions "proximal end" and "distal end" can refer to two opposite ends of, for example, a hole in the gingival part of the model, where the distal end can refer to the part of the said hole that is farthest from the hole's entrance. The distal end can also be referred to as the bone end.
[00060] In some modalities, the virtual model comprises a restoration configured to be inserted in the virtual model in the region configured to insert a restoration.
[00061] In some embodiments, the restoration comprises a complete restoration or a part of a restoration, such as a fixation abutment or a crown disposed on said fixation abutment, an implant bar, or in principle any other indication used in relation to dental restorations.
[00062] In some modalities, restoration is to be placed in its correct anatomical position relative to said gingival part of the model.
[00063] In some modalities, configuring the gingival part ensures that the restoration can be positioned on a physical model manufactured from the virtual model, the restoration even in the case where the surface of the gingival part of the virtual model generated from a three-dimensional representation and a contiguous surface of the restoration overlap.
[00064] In the context of the present invention, the expression "the model" can be used in relation to both the physical and virtual manifestation of the set of teeth. In some modalities, there is a one-to-one relationship between the virtual model and the physical model of the set of teeth.
[00065] In some modalities, configuring the gingival part comprises modifying the gingival part of the virtual model generated from the three-dimensional representation.
[00066] The virtual representation of the set of teeth can be provided by scanning the set of teeth, such as by sweeping the set of teeth by means of an intraoral scanner or by scanning an impression of the set of teeth.
[00067] In some embodiments, a unit, such as a healing abutment, a sweep body, or an implant analog, is disposed in the region configured for insertion of a restoration during the sweep of the set of teeth. The generated virtual model of the set of teeth can therefore show this unit. The method may comprise digitally removing this unit from the virtual model or may comprise generating a virtual model of the set of teeth where this unit is not part of the virtual model.
[00068] In some embodiments, configuring the gingival portion comprises configuring the material of the gingival portion in the restoration to be soft enough so that a restoration can deform the gingival portion. In a physical model fabricated from the virtual model, the material can be soft enough that an operator, such as an orthodontic technician, can arrange the restoration in its correct anatomical position without having to use excessive force.
[00069] In some embodiments, configuring or modifying the gingival part comprises virtually removing a part of said gingival part in the configured region for insertion of a restoration.
[00070] The configuration of the gingival part of the model may comprise digitally cutting a part of the gingiva so that the volume of the restoration and the volume of the gingiva do not overlap.
[00071] After a material removal from the model, in a physical model fabricated from the virtual model the gingival part is configured to follow the surfaces contiguous to the restoration so that a correct positioning of the restoration is allowed. This can correspond to cutting the gingiva for the restoration, ie, that the gingival part of the model adapts to the restoration. In this modality, the entire gingival part of the model can be fabricated from a relatively hard material as there is no overlap between the volumes of the gingival part of the model and the restoration when the latter is correctly positioned on the model.
[00072] In the context of the present invention, the expression "to follow the contiguous surfaces of the restoration" may refer to the case where the restoration is arranged in relation to the gingival part such that at least a part of the subgingival part of the restoration has a surface that is substantially parallel to surfaces contiguous to the gingival portion. Surfaces adjoining the subgingival portion of the restoration and the gingival portion can be offset by a substantially constant distance over a smaller portion of their common area, so that there is a substantially constant displacement between the subgingival portion of the restoration and the gingival portion over that area . The adjoining surfaces can be taken to be the area of the side walls of a hole in the gingival part, where said hole is configured for the insertion of a restoration. The side walls can be the surface of this hole which is located along the insertion direction of the restoration into the gingival part.
[00073] In some modalities, the method comprises virtually adding material to the gingival part of the virtual model in the region configured for insertion of a restoration. The virtual addition of material can occur after a virtual removal of material in the region configured for insertion of a restoration.
[00074] In some modalities, the gingival part of the virtual model of the set of teeth defines a first surface in the region configured for insertion of a restoration.
[00075] In some modalities, the first surface follows at least a section of said gingival emergence profile in the region.
[00076] In some embodiments, modifying the virtual model of the set of teeth comprises replacing said first surface with a second surface, where said second surface is formed so that the virtual model of said restoration can be virtually disposed in said virtual region of the implant with no overlap with the modified virtual model of the set of teeth.
[00077] In some modalities, at least a section of said second surface is defined by displacing part of the surface of the virtual model of the restoration. The offset can be such that the second surface delimits the surface of the virtual model of the restoration.
[00078] In some modalities, the method comprises subtracting the virtual model of the restoration or the volume delimited by the displacement surface of the virtual model of the set of teeth. The second surface can then be identical or based on the virtual surface of the gingival part from which a volume is subtracted.
[00079] In some modalities, the gingival part of the virtual model of the set of teeth after the virtual removal of a part of the gingiva defines the second surface in the region configured for insertion of a restoration. The second surface can be referred to as a cut surface. Cutting the gingival part on the second surface can correspond to cutting the gingival part for the restoration.
[00080] In some modalities, after virtually adding material to the gingiva, the gingival part of the virtual model of the set of teeth defines a third surface in the region configured for insertion of a restoration.
[00081] The third surface may be substantially identical to said first surface.
[00082] The first, second and third surfaces are provided in the virtual model of the set of teeth. In a virtual model, surfaces can be defined as a result of generating the gingival part of the model. In a physical model, surfaces can be realized when the volume of the gingival part of the model is manufactured.
[00083] In some modalities, the gingival part of the virtual model of the set of teeth is divided into a first and a second gingival region by the second surface, where said second gingival region is disposed between the second surface and the third surface, in which the second surface forms an interface between the first and second gingival region.
[00084] The first gingival region can be configured to be fabricated from a first material in a physical model manufactured from the virtual model. In some embodiments, the method comprises fabricating the physical model of the set of teeth such that the part of the physical model that corresponds to the first gingival region of the virtual model of the set of teeth is fabricated from a first material.
[00085] The second gingival region can be configured to be fabricated from a second material in a physical model manufactured from the virtual model.
[00086] In some embodiments, the method comprises manufacturing the physical model of the set of teeth so that the part of the physical model that corresponds to the second gingival region of the virtual model of the set of teeth is manufactured from a second material.
[00087] In some embodiments, the second material is configured to be softer than the first material under ambient conditions. The penetration hardness of the second material may be less than that of the first material.
[00088] The second material is configured to be comprised of a removable drive in a physical model fabricated from the virtual model. Adding material to the gingival part of the model may comprise generating a gingival mask.
[00089] The gingiva mask can be produced from a relatively hard material and can be moved before placing the restoration on the model so that an overlap between the gingival portion and the restoration can be avoided by removing the gingiva mask before positioning the restoration.
[00090] The gingiva mask can be configured to comprise a first retaining structure configured to correspond to a second retaining structure arranged in the gingival part of the model, so that the gingiva mask is arranged correctly when said first and second structures of retention correspond.
[00091] In some modalities, the gingival part of the model comprises a lower layer region, in which said second gingival region is partially confined.
[00092] In some embodiments, a gap is provided between the contiguous surfaces of the restoration and the gingival part of the model.
[00093] In some embodiments, the method comprises that the model teeth are made of a relatively harder, less flexible material and at least the model gingiva around the restoration is made of a relatively softer, more flexible material.
[00094] It may be an advantage to manufacture the model teeth from a relatively harder material and the gingival part of the model from a relatively softer material, because then the different materials resemble the real materials in the mouth, and this facilitates testing or restoration modeling.
[00095] The second material can be configured to be softer than the material used to fabricate the restoration.
[00096] The physical model material can be plaster which is often used for physical models of teeth, or a relatively harder material used for 3D printing of a physical model. The second material can be a softer, more compressible dental silicone.
[00097] A covering for delimiting a volume in cooperation with a physical model of a set of teeth is disclosed, where said covering is for use when filling said volume with a second gingival material, wherein said covering comprises a part of implant engagement; - an upper part comprising a surface facing the model and a hollow channel, where a part of the surface facing the model is configured to contact the physical model of the set of teeth and the second part is configured to delimit said volume in collaboration with the surface of the physical model, and where said hollow channel provides a net connection to the delimited volume.
[00098] In some embodiments, the method comprises providing a covering that, in cooperation with the first gingival region, is configured to delimit the second gingival region.
[00099] The cover may comprise an opening configured to allow the injection of said second material into said second gingival region in a physical model manufactured from the virtual model of the teeth.
[000100] The cover can be configured to have a surface facing said second gingival region, which surface can be formed as said third surface.
[000101] When the roof is laid out in relation to the physical model, the surface facing the model defines the surface of the second gingival region when the volume bounded between the roof and the physical model is filled with a material that is sufficiently soft and compressible to so that an operator with reasonable effort can deform it by pressing the restoration into the material. The cover defines said third surface.
[000102] In some modalities, the implant engagement part of the cover is dimensioned according to the implant analog in the physical model.
[000103] In some embodiments, the surface facing the roof model is connected to the fixation pillar, so that for a particular fixation pillar, the surface is such that the third surface generated is formed according to the corresponding surfaces of the fixation pillar.
[000104] In some modalities, the method comprises designing and configuring the model to be manufactured through a specific manufacturing process.
[000105] In the context of the present invention, the expression "transverse" can refer to a plane that is perpendicular to the longitudinal direction. For example, the transverse shape of an implant analog element may be the shape of the implant analog in this plane crossing the base.
[000106] In some modalities, the model comprises two or more restorations. The method according to the present invention can of course be applied to any number of restorations in a set of teeth, such as two, three, four or more restorations.
[000107] In some embodiments, the method comprises obtaining a virtual representation of a set of teeth and forming a virtual model of said set of teeth from said virtual representation.
[000108] In some embodiments, the virtual representation of the set of teeth is provided by scanning the set of teeth by means of an intraoral scanner or by scanning an impression of the set of teeth. The virtual representation of the set of teeth can comprise a point cloud.
[000109] Therefore the virtual model and then the physical model can be created based on raster eg an impression instead of eg creating a model by merging the model from an impression. An advantage of this modality is that better accuracy is obtained because the print itself is swept rather than sweeping a cast or spilled pattern, where defects may have emerged when making the pattern. Furthermore, it can be an advantage that the manual and time-consuming work of making the plaster model from impression is avoided. Therefore this modality provides a simpler and possibly faster and cheaper process.
[000110] One reason to fabricate a physical model from impression is that orthodontic technicians may prefer to have a physical model to work with when they adapt the dental restoration(s) to a patient.
[000111] The print can then be swept to create a representation of both the upper and lower jaws. In this way the virtual model is automatically generated in software based on the print scan.
[000112] In some modalities, the method comprises removing additional parts of the model that correspond to the gingiva, so that it becomes easier for a user to obtain, for example, an analog of the implant from the physical model.
[000113] In some embodiments, the method comprises applying a scan of the entire set of teeth so that the antagonist is visualized, and providing a virtual articulator, so that the entire set of teeth can be tested by occlusion.
[000114] In some modalities, the method comprises manufacturing the physical model through printing or three-dimensional milling.
[000115] Examples of 3D printing or milling are:- inkjet-like principle, where it is possible to fabricate the outer part of the physical model in a high quality and/or expensive material, and the inner part can be fabricated from a cheaper material such as eg wax; - standard 3D printing; - standard 3D milling; - stereolithography (SLA), which is a kind of rapid prototyping process; - selective laser sintering (SLS), which is a kind of fast prototyping process.
[000116] In some modalities, the method comprises designing and adapting the model to be manufactured through a specific manufacturing process. For example, different materials can be chosen to manufacture the physical model.
[000117] In some embodiments, the restoration or a unit of which the restoration is a part, is fabricated so that the restoration is positioned on the physical model that matches the position of the actual anatomical teeth in the patient's mouth.
[000118] In some embodiments, the anatomically correct position of the restoration is with respect to height relative to the model, with respect to the horizontal position which can be controlled by ensuring that the restoration cannot rotate when installed in the model.
[000119] When the restoration is arranged to have a correct anatomical height relative to the gingival part of the model, a crown of the restoration can be placed correctly relative to the horizontal plane of the tooth model.
[000120] The physical model of the set of teeth can be used by an orthodontic technician to develop a model of the restoration, which may be known as the wax modulation. The restoration template or wax modulation can then be used to cast the actual restoration, which is, for example, made of a metallic material, such as a porcelain-coated metal crown.
[000121] The physical model can be used to verify that a fabricated restoration actually fits the physical restoration in the physical model.
[000122] Even if the restoration is produced by CAD/CAM, it is still advantageous to verify that the restoration produced has a correct fit by checking the restoration on the physical model. There are a few steps in the fabrication process, so potentially something can go wrong with one of the steps, so it's best for the orthodontist to discover and correct an error before the restoration is shipped to the dentist and inserted into the patient's mouth.
[000123] If the restoration is produced from a material that can change shape or size, eg zirconium dioxide also known as zirconia, it is also an advantage to check the restoration after production, as the material may then shrink or become bent during and/or after the heating process.
[000124] If the restoration is produced manually and/or when the porcelain work on the restoration is performed manually, then the orthodontic technician needs a model of the other teeth in the set of teeth to verify that there is sufficient space between the teeth adjacent to the restoration and that the shape of the porcelain corresponds to the borderline teeth.
[000125] If the model is manufactured by 3D printing, many models can be manufactured simultaneously compared to, for example, manufacturing by milling.
[000126] In some embodiments, the method comprises digitally repositioning the gingival part of the model around the restoration, such as digitally repositioning the gingival part before fabricating the physical model of the set of teeth.
[000127] This repositioning can be an advantage because there is often a problem that when a tooth is prepared in the patient's mouth, then much of the tooth is ground so that the soft compatible gingival tissue around the prepared tooth comes together. or follow or deform into the new reduced shape of the prepared tooth instead of remaining in the original shape following the unprepared tooth. So when, for example, the impression of the prepared tooth is made, then the gingiva is contiguous with the prepared tooth and the model of the teeth manufactured will then have a gingiva adjacent to the restoration, and therefore there may not be any space between the gingiva and the restoration to model and install a restoration. But when the gingival part of the model is repositioned, removed, or moved around the restoration then there is space for the restoration and coating, eg porcelain, which the dentist can add after inserting the restoration into the patient's mouth .
[000128] In some modalities, digitally repositioning the gingival part of the model comprises digitally moving the gingival part of the model away from the restoration.
[000129] The digital repositioning of the gingival part of the model may comprise moving the gingiva adjacent to the restoration. In some modalities, digitally repositioning the gingival part of the model comprises digitally moving the gingival part of the model outward relative to the restoration.
[000130] It may be an advantage that the gingival part of the model can be moved without changing the size of the gingiva, which is important as the gingiva in the patient's mouth will also only change shape and move, but not change its shape. size, that is, the gum doesn't get bigger or smaller, it just changes shape.
[000131] It may be an advantage that if the restoration model is designed using CAD, then it can be derived from the CAD program how much the gingiva on the teeth model must be moved in order to fit the modeled restoration.
[000132] The method comprises manufacturing the physical model through printing or three-dimensional milling.
[000133] In some embodiments the physical model can be fabricated using a casting mold to cast an at least partially soft mold as part of the physical model of the set of teeth.
[000134] The casting mold can be adapted to be manufactured by means of rapid prototyping such as 3D printing.
[000135] A CAD model of a foundry mold can be generated as an impression of at least a part of the virtual model, said CAD model of a foundry mold thus comprises the negative geometry of the set of teeth.
[000136] A physical model can be manufactured from a virtual model of the set of teeth generated and modified by the method according to the present invention.
[000137] In some modalities, the method comprises providing that the model comprises a lateral ejection hole through which the restoration in the physical model can be contacted and ejected from its cavity.
[000138] The hole can be arranged in the gingival part of the model.
[000139] It may be an advantage that when providing an ejection hole on the side of the model, then this hole is accessible from the side, which can be an advantage when, for example, mounting the model on an articulator, where the model can be accessed from the side as opposed to the bottom of the model which is attached to the articulator. It can therefore be an advantage to accommodate the ejection hole on the side of the model rather than on the bottom of the model. However, a hole, for example an ejection hole, can alternatively and/or additionally be arranged at the bottom of the model.
[000140] In some embodiments, the method comprises providing that the restoration comprises a hole adapted to be disposed in continuation to the lateral ejection hole in the model, when the restoration is disposed in the cavity of the model.
[000141] It can be an advantage that when you provide a hole in the side of the model and a hole in the restoration, then when the two holes are aligned, that is, arranged in continuation of each other, or arranged end to end, then the restoration be arranged correctly relative to the model.
[000142] It can be verified that the hole in the restoration and the hole in the model are aligned by visual inspection or using a tool adapted to fit the holes. Therefore when the tool can move smoothly through the hole in the model and into the hole in the restoration, then the alignment of the restoration in the model will be correct. In some embodiments, the side ejection hole is arranged so that the tool can move the full path through both the model and the restoration, so the tool is inserted into one side of the model and can pass through the model to the other side. of model. Therefore, in some embodiments, the lateral ejection hole is arranged so that a tool can pass through a section of the model comprising both the restoration and the gingival part of the model surrounding the cavity in which the restoration is disposed, so that the tool can be inserted on one side of the section and can pass through the section to a side of the section disposed opposite the restoration.
[000143] In some embodiments, the method comprises arranging the hole in the model as a hollow hole that passes from the surface of the model to the cavity for the restoration, and arranging the hole in the restoration as a blind hole.
[000144] The hollow hole can pass through the gingival part of the model. The hole in the restoration can be arranged as a blind hole in a position that corresponds to the root of the restoration.
[000145] In some embodiments, the method comprises arranging the hole in the model as a hollow hole that passes from the surface of the model to the cavity for the restoration, and arranging the hole in the restoration as a hollow hole. The hollow hole can pass through the gingival part of the model. The hole in the restoration can be arranged as a hollow hole in a position that matches the root of the restoration.
[000146] Therefore the hole in the restoration can be a hollow hole that passes the entire path through the restoration to the other side of the cavity. In this case the hole in the model can then pass through the entire model, that is, pass from the model surface to one end of the cavity within the model, and from the other end of the cavity through the model to the other surface of the model. It may be an advantage to have a lateral ejection hole that is a hollow hole in both the model and the restoration, as the positioning of the restoration in the model can then be verified by visual inspection, which can be facilitated when there is a free passage through the whole model and restoration.
[000147] Furthermore, it can be an advantage for model and restoration fabrication to produce the lateral ejection holes as hollow holes. For example, the model and restoration can be manufactured using jet printing, and, for example, a soft support material can be placed on the model and restoration where there should be no material in the final version. When fabrication of the model or restoration has been completed, the supporting material will be removed, eg washed, melted or excavated. In this case it may be easier to remove all support material from a hole if the hole is a hollow hole rather than a blind hole.
[000148] In some embodiments, the method comprises arranging the restoration on the gingival part of the model so that the restoration is adapted to be inserted and removed from the gingival part of the model without conflicting with or being blocked by the boundary teeth in the model.
[000149] In some embodiments, the method comprises arranging the restoration on the model so that the insertion direction of the restoration matches the insertion direction of the actual anatomical tooth in the set of teeth.
[000150] In some embodiments, the method comprises arranging the restoration in the gingival part of the model so that the direction of insertion of the restoration is so oblique that the restoration is adapted to be inserted and removed from the gingival part of the model without conflicting or being blocked by the bordering teeth in the model.
[000151] In some embodiments, the method comprises determining an insertion path for the restoration. The insertion path can be according to the direction of insertion into the implant.
[000152] In some embodiments, the method comprises identifying a circumference line for the restoration. The circle line can be defined as the outer circumference of the restoration when the virtual model of the restoration is viewed along the insertion direction or insertion path. When a virtual restoration model offset surface is defined, the circle line can be defined as the outer circumference of the offset surface when the offset surface is viewed along the insertion direction.
[000153] In some embodiments, an extrusion volume is defined by the insertion direction and the circle line. The extrusion volume defines the volume through which the restoration travels when it is inserted into or removed from the gingival portion of the virtual model of the set of teeth.
[000154] The orientation of the extrusion volume may have a slightly different direction than the insertion direction. This may be the case for some sections of the extrusion volume when the extrusion volume is defined by the circumference line and an insertion path which in these sections differs from the insertion direction determined at the gingival part.
[000155] In some embodiments, the method comprises providing that an implant analog configured to be positioned, for example, in the gingival part of the model comprises a stop surface that acts as a stop for the implant analog when it is positioned in the gingival portion, so that the implant analogue is prevented from being pushed further into the gingival portion of the model than corresponds to the correct anatomical height of the implant analogue.
[000156] In some embodiments, the stop surface is flat and horizontal.
[000157] The stop surface can be flat and horizontal relative to the rest of the model, and/or relative to the insertion direction of the implant analog in the gingival part etc.
[000158] It may be an advantage that the stop surface is flat and horizontal as this can provide optimal positioning and support of the implant analog in the model.
[000159] In the context of the present invention, the term "horizontal" may refer to a plane that is substantially parallel to the plane of occlusion of the patient's dentition.
[000160] In some embodiments, the method comprises that when the model is printed in 3D, at least part of the stop surface is horizontal with respect to the rest of the model.
[000161] Therefore the overall shape of the stop surface can be oblique, skewed or slanted, but each single print layer must be horizontal so the slanted surface will be made up of some small horizontal parts. This provides a very good fit.
[000162] If the model is milled instead of 3D printed, then the stop surface may not be horizontal but may be in any direction.
[000163] In some embodiments, the method comprises that the surface of the stop is arranged in a printing layer that is also present in the rest of the model.
[000164] It may be an advantage that the stop surface so is level with the bottom of the implant analog so that the implant analog can be pushed down exactly into the correct layer on the model so that the position of the implant analog in the model is anatomically correct with respect to the height of the implant analog in the physical model.
[000165] Therefore the stop layer is at a height h which is h = n x thickness of the printing layer.
[000166] In some embodiments, the method comprises providing that one or more adjacent teeth in the model are adapted to be inserted in a removable way in the model.
[000167] One advantage is that when adjacent or borderline teeth can be removed from the model, then it may be easier for the orthodontist to develop the model of a restoration, as there is then free space around these teeth, for example, on all or some of the sides.
[000168] The physical model can be manufactured using a casting mold to cast an at least partially soft mold as part of the physical model of the set of teeth, where the casting mold is adapted to be manufactured by means of rapid prototyping, such as 3D printing. A CAD model of the foundry mold is generated as an impression of at least a part of the virtual model, said CAD model of the foundry mold thus comprising the negative geometry of the set of teeth. At least one cutout of the casting mold CAD model can be defined by means of at least one separation plane and/or separation parametric curve.
[000169] Also disclosed is a computer program product comprising program code means for causing a data processing system to execute the method, when said program code means is executed in the data processing system, and a computer program product comprises a computer readable medium having stored therein the program code medium.
[000170] According to another aspect, an ejection tool for ejecting a restoration disposed in a physical model of a set of teeth is also disclosed.
[000171] In some embodiments, the ejection tool comprises an elongated component that is adapted to fit into a hollow hole in the gingival part of the model.
[000172] In some embodiments, the ejection tool is adapted to fit into a blind hole and/or a hollow hole in the restoration.
[000173] The present invention relates to different aspects including the method described above and the following and corresponding methods, devices, systems, uses and/or means of product, each of which produces one or more of the benefits and advantages described in connection with the first mentioned aspect, and each having one or more modalities that correspond to the modalities described in connection with the first mentioned aspect and/or disclosed in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS
[000174] The above and/or additional objectives, features and advantages of the present invention will be further elucidated by the detailed and non-limiting description of embodiments of the present invention below, with reference to the attached drawings, in which:
[000175] Fig. 1 shows a schematic of a volume conflict of a virtual model of a restoration and a gingival part of a virtual model of a set of teeth.
[000176] Fig. 2 shows an embodiment of the method according to the invention.
[000177] Fig. 3 shows an embodiment of the method according to the invention.
[000178] Fig. 4 shows an example of digitally repositioning the gingival part of the model around a restoration.
[000179] Fig. 5 shows an embodiment of a method according to the invention, in which collision between an extrusion volume and a part of teeth of the virtual model of the set of teeth is avoided.
[000180] Fig. 6 describes how the virtual model of the set of teeth can be generated and modified.
[000181] Fig. 7 shows how a covering arranged in relation to a physical model of the teeth can be used when making a second gingival region made of a relatively soft and compressible material.
[000182] Fig. 8 shows schematic representations of the inventive covers according to the present invention
[000183] Fig. 9 shows an analog of the inventive implant.
[000184] Figures 10 and 11 show snapshots of an implementation of the invention.
[000185] In the following description, reference is made to the attached figures, which show by way of illustration how the invention can be practiced.
[000186] In Figures 1, 2, 3, 5 and 7 a fixation abutment for a dental implant is used as an illustrative example of a dental restoration. Of course, the restoration can also consist of or comprise other parts such as a crown, a bridge, a removable prosthesis, or a prosthesis.
[000187] Fig. 1 shows a schematic of a conflict between volumes of a virtual model of a restoration and a gingival part of a virtual model of a set of teeth.
[000188] In procedures relating to a dental implant and a corresponding dental restoration, such as the illustrated fixation abutment, the orthodontist often produces a physical model of the set of teeth with an implant analog positioned in the gingival portion of the physical model. In some cases, the restoration collides with the gingival portion of the physical model of the set of teeth so that the restoration cannot be inserted into the physical model of the set of teeth, ie the dental restoration cannot be positioned in the correct anatomical position on the physical model of the set of teeth.
[000189] A virtual representation of this situation is illustrated in Fig. 1, where a virtual model 10 of the set of teeth shows two teeth 11, 12 and an implant 13 which in the manufactured physical model is replaced by an analog of the implant and a first surface 15 of which at least a part refers to the gingival emergence profile. A virtual model of restoration 14 is inserted into virtual model 10 of the set of teeth in its correct anatomical position. As seen in the figure, there is an overlap 16 between the volumes of the virtual model of the restoration 14 and the gingival part of the virtual model 10 of the set of teeth. For a restoration and a physical model of the set of teeth, the conflict represented by the virtual overlay 16 prevents insertion of the restoration.
[000190] The virtual model of the set of teeth 10 can be generated from one or more three-dimensional representations of the set of teeth provided by, for example, scanning an impression of the set of teeth or by direct intraoral scanning using a portable scanner, such as the TRIOS® intraoral scanner.
[000191] The sweep can provide three-dimensional representations in the form of a cloud of points that can be converted to a virtual model of the set of teeth, for example, by triangulation.
[000192] Fig. 2 shows an embodiment of a method according to the invention, in which the virtual model of the set of teeth 10 is modified by virtually removing a part of the gingival part, so that space for more material is provided. soft in a physical model fabricated from the modified virtual model of the set of teeth.
[000193] In Fig. 2a, the virtual model 10 of the set of teeth shows two teeth 11, 12 and an analog of the implant 13. The virtual model of the restoration 14 is virtually inserted so that it is arranged in its correct anatomical position . Overlay 16 prevents insertion of the restoration into a physical model that corresponds to the virtual model 10 of the set of teeth as described above in relation to Fig. 1.
[000194] The boundaries of a section that is to be modified can be identified using a first 3D parametric curve 151 and a second 3D parametric curve 152. 3D parametric curves can be defined manually by an operator using, for example, a pointing device , such as a computer pointing device, and a computer screen on which the virtual model 10 of the set of teeth is visualized. Thresholds can also be automatically derived using computer-implemented algorithms configured to determine, for example, a line of preparation for a fixation abutment.
[000195] In Fig. 2b, the gingival part of the virtual model 10 of the set of teeth has been modified so that the section is now formed according to a second surface 17, where the second surface 17 is such that the overlap 16 seen in Fig. 2a is avoided. This corresponds to having virtually removed a part of the gingival part of the virtual model 10 from the set of teeth, so that it changes from a shape according to the first surface 15 to a shape according to the second surface 17 in the modified virtual model 100 of the set of teeth.
[000196] In the figure, the second surface 17 has a smooth transition from the first to the second 3D parametric curve. The virtually removed part can also be defined by extending a cylinder to a horizontal plane covered by the second 3D parametric curve 152, where the cross section of the cylinder is formed according to the first 3D parametric curve 151. Based on the modified virtual model 100 of the set of teeth, a third surface 18 can be digitally determined, for example, by defining third and fourth 3D parametric curves in the modified virtual model 100. The third and fourth 3D parametric curves are then connected to define the third surface 18. The third and fourth parametric curves 3D can be identical to the first and second 3D parametric curves 151, 152 used to identify the boundaries of the part that is virtually removed to form the space for the second gingival region 19. That is, region 19 is defined by the second surface 17 and by the third surface 18 as illustrated in Fig. 2c. In a physical model 101 fabricated from the modified virtual model 100 of the set of teeth, a relatively soft compressible material can be provided in the second gingival region 19. The softer material portion can be fabricated by 3D printing and then arranged on the physical model of set of teeth 101. Fig. 2d shows a fixation post 140 inserted into the physical model of set of teeth 101 with a soft compressible material in the second gingival region 190.
[000197] When the second gingival region 19 is formed according to the third surface 18, there is still an overlap between the volumes of the virtual model of the dental restoration and the gingival part of the modified virtual model 100 of the set of teeth (which now has a surface according to the third surface 18), However, when the second material is sufficiently soft and compressible, the second gingival region 190 is deformed when the physical restoration 140 is inserted into the physical model of the set of teeth 100, thus allowing it to is arranged in its anatomically correct position as illustrated in Fig. 2d.
[000198] Fig. 3 shows an embodiment of a method according to the invention, in which the virtual model 10 of the set of teeth is modified by virtually removing a part of the gingival part.
[000199] In Fig. 3a, the virtual model of the set of teeth 10 shows two teeth 11, 12 and an implant / implant analog 13. The virtual model of the restoration 14 is inserted virtually in its correct anatomical position. The virtual overlay 16 prevents insertion of the restoration into a physical model that corresponds to the virtual model 10 of the set of teeth as described above in relation to Fig. 1.
[000200] In Fig. 3b, a portion of the gingiva in the region configured for insertion of the restoration has been virtually removed so that the gingiva in the region now defines a second surface 17. The virtual overlap 16 seen in Fig. 3a is now avoided and exists the space for the virtual model of the restoration 14 in its anatomically correct position. The second surface 17 can be defined by displacing the surface of the virtual model of the restoration 14, such as providing a uniform displacement as seen in the figure. However, due to the shape of the lower layer of the second surface 17, it may not be possible to insert the restoration into a physical model fabricated from the virtual model 10 of the set of teeth illustrated in Fig. 3b.
[000201] In Figures 3c and 3d, the insertion direction 20 for the restoration is taken into account. The insertion direction can be based on the orientation and position of the implant / implant analog 13 in the virtual model 10 of the set of teeth. A circle line 21 is defined on the outer circumference of the second surface 17 when this is viewed along the insertion direction 20. The circle line 21 can be determined using computer-implemented algorithms.
[000202] Then a cylinder delimiting an extrusion volume can be defined by the surface generated by translating the circumference line 21 along the insertion path 20 away from the implant analog 13. When the extrusion volume is subtracted from the virtual model 10 of the set of teeth a second corrected surface 171 is provided. Above the circumference line, the second corrected surface 171 differs from the second surface 17 due to said correction.
[000203] In a physical model manufactured from the modified virtual model 100 of the set of teeth, the correction with respect to the insertion direction ensures that the physical model does not have underlayers when viewed along the insertion direction of the restoration, so that restoration can be inserted into this physical model.
[000204] Fig. 4 shows an example of digitally repositioning the gingiva around a restoration.
[000205] Fig. 4a) shows the virtual model 401 of the set of teeth before a part of the gingiva 425 has been digitally repositioned.
[000206] Fig. 4b) shows the virtual model 401 of the set of teeth after a part of the gingiva 425 has been digitally repositioned. After the gingival portion 425 has been moved, the virtual model 401 of the set of teeth can be fabricated. When a tooth is prepared in the patient's mouth, much of the tooth can be ground so that the soft compatible gingival tissue around the prepared tooth gathers or follows or deforms to follow the new reduced shape of the prepared tooth rather than remaining. in the original shape following the original unprepared tooth. When the gingival portion 425 of the virtual model 401 set of teeth is repositioned, removed, or digitally relocated around the restoration 405 then there is room for a restoration 426 and veneer.
[000207] The gingival part 425 of the virtual model 401 of the set of teeth is moved outwards relative to the restoration 405, that is, away from the restoration, and it is moved without changing the size of the gingival part 425, just the shape of the gingival part 425 is changed.
[000208] If the virtual model of the 426 restoration is designed using CAD, it can be derived from the CAD program how much the gingival portion 425 in the virtual model 401 of the set of teeth must be moved in order to fit the virtual model of the 426 restoration.
[000209] Fig. 5 shows an embodiment of a method according to the invention, in which collision between an extrusion volume and a part of teeth of the virtual model of the set of teeth is avoided.
[000210] In Fig. 5, the insertion direction 20 for the restoration is taken into account when modifying the gingival part of the virtual model of the set of teeth. A circumference line 21 is defined on a second surface 17 defined by a displacement of the virtual model of the restoration 14. The insertion direction 20 is determined from the orientation and position of the implant analog 13 in the virtual model of the set of teeth. In the example of Fig. 5, the insertion direction 20 is inclined relative to the longitudinal axis of the teeth 11, 12. This causes the extrusion volume (defined by the insertion direction 20 and the circumference line 21) to collide with a part. of tooth 22 of virtual model of set of teeth. Consequently, the restoration cannot be inserted along the insertion direction 20 into a physical model fabricated from the virtual model of the set of teeth illustrated in Fig. 5a. However, at some distance from the implant region, the restoration may follow a different path so that collision can be avoided while the path is still aligned with the insertion direction 20 in the implant analog. This insertion path 23 is illustrated in Fig. 5b.
[000211] The insertion path 23 can be derived by combining a first extrusion volume defined by the circumference line 21 and the insertion direction 20 in the implant analog and a second extrusion volume defined by an upper circumference line and a direction of superior insertion, where the line of superior circumference can be defined with the part of the restoration corresponding to the incisal edge of the bordering teeth.
[000212] Fig. 6 describes how the virtual model of the set of teeth can be generated and modified to ensure that the virtual model of the restoration can be inserted with virtually no overlap between the volume of the restoration and the volume of the gingival portion of the virtual model of set of teeth.
[000213] The starting point of this part of the procedure is where an implant is installed in the patient's jaw bone and an operator wants to design a virtual model of the set of teeth so that a physical model fabricated from the virtual model of the set of teeth allow a fixation post to be inserted. When the fixation pillar can be inserted into the physical model of teeth a patient-designed crown can be placed on the fixation pillar and the aesthetic and functional properties of the engineered crown (and fixation pillar) can be evaluated.
[000214] A second three-dimensional representation of the set of teeth is obtained by intraoral scanning at 601 and a second virtual model of the set of teeth is generated. A sealing unit can be placed on the implant during this scan, but this sealing unit does not cover the emergence profile of the gingiva in the region. A second virtual model of the set of teeth that includes the gingival emergence line is then generated.
[000215] Then a scanbody is placed on the implant and a first three-dimensional representation of the set of teeth is obtained in a first 602 scan. The first and second scans use a common reference system so that the data from the first representation three-dimensional can be transferred directly to the second virtual model of the set of teeth. Data related to the parts of the set of teeth that involve the region where the implant is located were already obtained in the second scan, so in the first scan only the implant region is scanned
[000216] With the data from the first scan transferred to the second virtual model of the set of teeth, this virtual model now comprises both data related to the emergence profile and the scan body.
[000217] A CAD model of the scanbody is then 603 aligned with the scanbody portion of this second virtual model. In this way the position and orientation of the implant can be derived and a virtual model is generated with the position and orientation of the implant and the emergence profile 604.
[000218] The order in which these two scans are taken is not important, so the first scan can be performed before the second. If scanning with the scanbody is done initially, the scanbody is removed from the implant before the scan without the scanbody is performed. The emergence profile can then be extracted from the second virtual model (or directly from the second three-dimensional representation of the set of teeth) and transferred to the first virtual model, so that a virtual model of the set of teeth is generated.
[000219] In both cases, the generated virtual model of the set of teeth comprises a gingival part of the set of teeth, wherein said gingival part comprises a region configured for insertion of a restoration both with the gingival emergence profile and with the position and orientation of the implant.
[000220] The first and second scans can also be impressions of the patient's set of teeth using a scan flag to indicate the position and orientation of the implant.
[000221] The antagonist can also be scanned so that the occlusion of the restoration can be assessed and taken into account when modeling, for example, a crown for the implant.
[000222] The insertion direction of the restoration is determined in step 605.
[000223] A virtual model of the restoration for the set of teeth, such as a virtual model of a fixation abutment, is obtained in step 606 and virtually aligned with the generated virtual model of the set of teeth. The virtual model of the restoration can be designed for the patient's set of teeth, for example by defining the margin line using a 3D parametric curve.
[000224] When a final restoration design is obtained, it is subtracted from the virtual toothset model, or a volume that corresponds to a displacement surface of the virtual restoration model is subtracted from the virtual toothset model. Then an extrusion volume can be determined based on a circumference line of the restoration and the insertion direction. Then the extrusion volume is subtracted from the virtual model of the set of teeth so that the modified virtual model of the set of teeth 607 is given.
[000225] So the generated and modified virtual model of the set of teeth is such that the virtual model of the dental restoration can be inserted virtually in said region with no overlap between the volume of the restoration and the volume of the gingival part. A result of this procedure is that a restoration fabricated from the virtual model of the restoration, such as a fixation abutment, can be inserted into a physical model of the set of teeth fabricated from said modified virtual model of the set of teeth.
[000226] Fig. 7 shows how a covering arranged in relation to a physical model of the teeth can be used when realizing a second gingival region made of a relatively soft and compressible material.
[000227] Cover 200 comprises an upper part 201 that has a surface facing the template 202 and a hollow channel 203. Additionally the cover 200 has an implant engaging part 204, which is configured to fit in the implant analog 130 of a physical model of a set of teeth 101. When the cover 200 is disposed relative to the implant analog 130, the surface facing the model 202 delimits a volume 205 in collaboration with an opposite surface 206 of the physical model. The hollow channel 203 provides a liquid connection to the enclosed volume 205 so that the enclosed volume can be filled with a second gingival material through the hollow channel 203. When the enclosed volume 205 is filled with the second gingival material, the second material gingival is formed according to the surface facing model 202.
[000228] When the covering is removed the second gingival region 206 (which corresponds to the delimited volume 205) filled with the second gingival material will have been formed in the physical model of the set of teeth 101 as illustrated in Fig. 7b. The surface 207 of the second gingival region 206 is formed in accordance with the surface facing the pattern 202 of the covering.
[000229] The surface 208 of the physical model 101 of the set of teeth can be defined manually by grinding.
[000230] If the second gingival material is sufficiently soft and compressible, the dental restoration, here exemplified by the fixation pillar 140, can be inserted into the implant analog 130 by applying pressure that deforms the second gingival material sufficiently to allow insertion as illustrated in Fig. 7c. The second material can, for example, be a dental silicone.
[000231] In some embodiments, the surface facing the roof model is formed according to the surface of a known fixation pillar. That is, different covers can be manufactured based on the surfaces of known fixation posts, so that the second gingival section formed by a cover is formed according to a corresponding fixation post. So the requirements for the compressibility of the second gingival material are less stringent and a wider variety of materials can be used.
[000232] Fig. 8 shows schematic representations of the inventive covers according to the present invention.
[000233] Fig. 8a shows an example of a cover 200 with an implant engaging part 204, and an upper part with a surface facing the template 202 and a hollow passage. When the cover is disposed relative to a physical model of a set of teeth, the implant engaging portion 204 is installed in the implant analog and the lower portion 209 of the upper portion rests on a gingival portion of the physical model. The length of the implant engaging part 204 is adapted to ensure that its positioning on the implant analog can be adjusted so that the lower part 209 delimits a volume in collaboration with the physical model.
[000234] Fig. 8b shows an example of a cover 200 where the surface facing the model 202 is formed according to the surface of a known fixation pillar 14. The part of the surface facing the model 202 closest to the part implant engagement 204 is formed in accordance with the mating surface of the fixation post 14 or by a well-defined displacement of the mating surface. When the second gingival region is formed using this covering, the corresponding fixation post will fit within the physical model even if the second gingival material is relatively incompressible.
[000235] Fig. 9 shows an example of an implant analog configured to be disposed in the gingival part of a physical model of a set of teeth.
[000236] The figure shows a side view of an implant analog 501 arranged in a hole defined in the gingival part 503 of the physical model. A central volume 502 extends along the longitudinal direction of the implant analog from one end of the crown towards its distal end 505. At the distal end 505, a stop surface 506 is configured to have a so reduced cross-sectional area. that space is left for rounded corners 507 of the hole wall and potentially excess material that has not been removed from the hole. Rounded corners can be generated when the drill used to define the hole has a rounded tip. The transverse shape 504 of the implant analog illustrates a way to ensure that the implant analog can only be arranged with its correct orientation relative to the gingival portion of the physical model.
[000237] A 508 height inspection groove is defined on the 501 implant analog to allow visual or contact-based inspection of whether the 501 implant analog is disposed in the correct position on the gingival portion of the physical model. A window or hollow hole (not shown in Fig.) may be provided on the gingival portion of the model to allow visual and/or physical contact with the implant analog on the outside of the model.
[000238] The window or hollow hole can be provided in the virtual modeling of the gingival part of a set of teeth so that it is formed directly with the fabrication of the physical model or after the fabrication of the physical model.
[000239] Fig. 10 shows a snapshot of an implementation of the invention.
[000240] A virtual 1080 model of the set of teeth with the 1081 position and orientation of the implant will have been generated using the method of the invention. Also seen in the snapshot is the 1082 restoration (a fixation abutment) which is to be designed based on the set of teeth.
[000241] Fig. 6 describes some modalities of the method to generate this virtual model of the set of teeth.
[000242] Fig. 11 shows snapshots of an implementation of the invention.
[000243] The virtual model of the set of teeth 1180 has now been equipped with a base and connectors to, for example, lay out the physical model manufactured on an articulator. In Fig. 11 is seen an emergence profile 1190 in the region configured for the restoration. In Fig. 11b, the virtual set of teeth model will have been modified to ensure that there is no overlap between the virtual model of the restoration (the Fixation abutment) and the virtual set of teeth so that the fabricated restoration can be inserted into a physical model of the set of teeth manufactured from said virtual model of the set of teeth generated and modified.
[000244] Although some embodiments have been described and shown in detail, the invention is not restricted thereto, but can also be incorporated in other ways within the scope of the object defined in the following claims. In particular, it should be understood that other embodiments can be used and structural and functional modifications can be made without departing from the scope of the present invention.
[000245] In the device claims that enumerate some means, some of these means may be incorporated by one and the same piece of hardware. The mere fact that certain measures are enumerated in mutually different dependent claims or described in different modalities does not indicate that a combination of these measures cannot be used to advantage.
[000246] It should be emphasized that the term "comprises" when used in this specification is taken to specify the presence of enumerated features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
[000247] It should be emphasized that the term "according to any of the preceding claims" may be interpreted to mean "according to any one or more of the preceding claims", so that the limitations of one or a few dependent claims can be read within an independent claim.
[000248] The characteristics of the method described above and below can be implemented in software and executed in a data processing system or other processing means caused by the execution of computer-executable instructions. Instructions can be means of program code loaded into memory, such as RAM, from a storage medium or from another computer through a computer network. Alternatively, the features described can be implemented by hardware circuits instead of software or in combination with software.Items:
[000249] 1. A method for generating and modifying a virtual model of a set of teeth, wherein said set of teeth comprises a region configured for insertion of a restoration, wherein the region is located in a gingival part of the set of teeth , where the method comprises: - obtaining at least a three-dimensional representation of the set of teeth; - generating a virtual model of the set of teeth from said three-dimensional representation, where the virtual model of the set of teeth comprises a gingival part, in which the said gingival part comprises a virtual region corresponding to said region configured for insertion of a restoration and at least part of the gingiva surrounds said region; obtaining a virtual model of said restoration; and - modify the gingival part of the virtual model of the set of teeth so that the virtual model of the restoration can be inserted virtually within said virtual region with no overlap between the volume of said virtual model of the restoration and the volume of said gingival part of the virtual model of set of teeth.
[000250] 2. The method according to item 1, in which a first three-dimensional representation of the set of teeth is obtained by scanning the set of teeth of the patient with a scanning body disposed in said region of the implant.
[000251] 3. The method according to item 1 or 2, where said virtual model of the set of teeth is generated at least in part from said first three-dimensional representation.
[000252] 4. The method according to any of the preceding items, wherein a second three-dimensional representation of the set of teeth is obtained by sweeping the set of teeth of the patient with the emergence profile in said region of the implant being visible.
[000253] 5. The method according to any of the preceding items, where said virtual model of the set of teeth is generated at least in part from said second three-dimensional representation.
[000254] 6. The method according to any of the preceding items, wherein one of said first or second three-dimensional representations of the set of teeth is obtained by sweeping a relatively larger section of the set of teeth of the patient, and the other of said first or second three-dimensional representations are then obtained by sweeping a relatively smaller section around the implant region.
[000255] 7. The method according to any of the preceding items, wherein the method comprises generating a first virtual model of the set of teeth from said first three-dimensional representation of the set of teeth.
[000256] 8. The method according to any of the preceding items, wherein the method comprises generating a second virtual model of the set of teeth from said second three-dimensional representation of the set of teeth.
[000257] 9. The method according to any of the preceding items, wherein the method comprises combining the first and second virtual models of the set of teeth to generate said virtual model of the set of teeth.
[000258] 10. The method according to any of the preceding items, wherein a virtual model of the scanbody is provided and virtually aligned with the first virtual model of the set of teeth to determine the orientation and position of the implant.
[000259] 11. The method according to any of the preceding items, where the restoration is designed based on the virtual model of the set of teeth.
[000260] 12. The method according to any of the preceding items, where the restoration is a prefabricated restoration such as a prefabricated fixation abutment.
[000261] 13. The method according to any of the preceding items, where the modified virtual model of the set of teeth serves to manufacture a physical model of the set of teeth.
[000262] 14. The method according to any of the preceding items, where at least a subgingival part of the virtual model of the restoration is configured to take the form of an anatomically correct restoration.
[000263] 15. The method according to any of the preceding items, where the gingival part of the virtual model of the set of teeth generated directly ensures that the volume of the restoration and the volume of the gingival part do not overlap.
[000264] 16. The method according to any of the preceding items, where the virtual model of the set of teeth is generated in one step and where the gingival part of the virtual model is subsequently modified to ensure that the volume of the restoration and the volume of the gingival part do not overlap.
[000265] 17. The method according to any of the preceding items, in which the gingival part of the virtual model of the set of teeth is modified to ensure that the contiguous surfaces of the virtual model of the restoration and the gingival part of the virtual model of the set of teeth teeth follow each other.
[000266] 18. The method according to any of the preceding items, in which a displacement is provided between the contiguous surfaces of the virtual model of the restoration and the gingival part of the virtual model of the set of teeth.
[000267] 19. The method according to any of the preceding items, wherein the method comprises determining an insertion path for the restoration.
[000268] 20. The method according to any of the preceding items, wherein the insertion path is according to the direction of insertion into the implant.
[000269] 21. The method according to any of the preceding items, wherein the method comprises identifying a circumference line for the restoration.
[000270] 22. The method according to any of the preceding items, where the circle line is defined as the outer circumference of the restoration when the virtual model of the restoration is viewed along the insertion direction.
[000271] 23. The method according to any of the preceding items, wherein the circle line is defined as the outer circumference of the offset surface when the offset surface is viewed along the insertion direction.
[000272] 24. The method according to any of the preceding items, wherein an extrusion volume is defined by the insertion direction and the circle line.
[000273] 25. The method according to any of the preceding items, in which an extrusion volume is defined by the insertion path and the circle line.
[000274] 26. The method according to any of the preceding items, in which modifying the gingival part of the virtual model of the set of teeth comprises digitally cutting a part of the gingiva so that the volume of the restoration and the volume of the gingiva do not overlap .
[000275] 27. A method to generate and modify a virtual model of a set of teeth to manufacture a physical model of the set of teeth, where the method comprises: - obtaining a three-dimensional representation of the set of teeth; - generating a virtual model of the set of teeth of said three-dimensional representation, wherein the virtual model of the set of teeth comprises a gingival part comprising a gingiva; and - modify the gingival part to allow an insertion of a restoration in a region of the virtual model configured for insertion of a restoration.
[000276] 28. The method according to any of the preceding items, in which modifying the gingival part comprises modifying the gingival part of the virtual model generated from the three-dimensional representation.
[000277] 29. The method according to any of the preceding items, wherein modifying the gingival part comprises configuring the material of the gingival part in the restoration to be soft enough so that a restoration can deform the gingival part.
[000278] 30. The method according to any of the preceding items, wherein modifying the gingival part comprises virtually removing a part of said gingival part in the region configured for insertion of a restoration.
[000279] 31. The method according to any of the preceding items, in which the method comprises adding material virtually to the gingival part of the virtual model in the region configured for insertion of a restoration.
[000280] 32. The method according to any of the preceding items, wherein the method comprises digitally repositioning the gingival part of the model around the restoration, before fabricating the model.
[000281] 33. The method according to any of the preceding items, in which digitally repositioning the gingival part of the virtual model of the set of teeth comprises digitally moving the gingiva away from the virtual model of the restoration.
[000282] 34. The method according to any of the preceding items, in which the gingival part of the virtual model of the set of teeth defines a first surface in the region configured for insertion of a restoration.
[000283] 35. The method according to any of the preceding items, wherein the first surface follows at least a section of said emergence profile.
[000284] 36. The method according to any of the preceding items, in which modifying the virtual model of the set of teeth comprises replacing said first surface by a second surface, where said second surface is formed so that the virtual model of the said restoration can be virtually disposed in said virtual region of the implant with no overlap with the modified virtual model of the set of teeth.
[000285] 37. The method according to any of the preceding items, in which the gingival part of the virtual model of the set of teeth after the virtual removal of a part of the gingiva defines the second surface in the region configured for insertion of a restoration.
[000286] 38. The method according to any of the preceding items, in which at least a section of said second surface is defined by displacing part of the surface of the virtual model of the restoration.
[000287] 39. The method according to any of the preceding items, wherein the method comprises subtracting the virtual model of the restoration or the volume delimited by the displacement surface of the virtual model of the set of teeth.
[000288] 40. The method according to any of the preceding items, in which the gingival part of the virtual model of the set of teeth after adding material virtually to the gingiva defines a third surface in the region configured for insertion of a restoration.
[000289] 41. The method according to any of the preceding items, in which the gingival part of the virtual model of the set of teeth is divided into a first and a second gingival region by the second surface.
[000290] 42. The method according to any of the preceding items, wherein said second gingival region is disposed between the second surface and the third surface, wherein the second surface forms an interface between the first and second gingival region.
[000291] 43. The method according to any of the preceding items, wherein said third surface is substantially identical to said first surface.
[000292] 44. The method according to any of the preceding items, wherein said first gingival region is configured to be manufactured from a first material in a physical model manufactured from the virtual model.
[000293] 45. The method according to any of the preceding items, wherein said second gingival region is configured to be manufactured from a second material in a physical model manufactured from the virtual model.
[000294] 46. The method according to any of the preceding items, wherein said second material is configured to be softer than said first material under ambient conditions.
[000295] 47. The method according to any of the preceding items, wherein the virtual representation of the set of teeth is provided by scanning the set of teeth, such as by scanning the set of teeth by means of an intraoral scanner or by scanning an impression of the set of teeth.
[000296] 48. The method according to any of the preceding items, wherein the restoration comprises a complete restoration or a part of a restoration, such as a fixation pillar or a crown disposed on said fixation pillar, an implant bar , or in principle any other indication used in relation to dental restorations.
[000297] 49. The method according to any of the preceding items, in which modifying the gingival part of the virtual model of the set of teeth comprises digitally cutting a part of the gingiva so that the volume of the restoration and the volume of the gingival part do not match overlap.
[000298] 50. The method according to any of the preceding items, wherein said second material is configured to be comprised in a removable drive in a physical model manufactured from the virtual model.
[000299] 51. The method according to any of the preceding items, in which the addition of material to the gingival part of the model comprises generating a gingival mask.
[000300] 52. The method according to any of the preceding items, wherein the gingival portion after being configured to allow correct placement of a restoration is configured to follow the contiguous surfaces of the restoration.
[000301] 53. The method according to any of the preceding items, in which a void is provided between the contiguous surfaces of the restoration and the gingival part of the model.
[000302] 54. The method according to any of items 51 to 53, wherein said gingival mask comprises a first retaining structure configured to correspond to a second retaining structure disposed on the gingival part of the model, so that the mask of gingiva is disposed anatomically correct when said first and second retaining structures match.
[000303] 55. The method according to any of the preceding items, wherein the gingival part of the model comprises a lower layer region, wherein said second gingival region is partially confined.
[000304] 56. The method according to any of items 28 to 33, wherein the method comprises configuring the gingival mask to comprise an opening, where the opening is configured to allow a restoration to access the gingival portion disposed below the gingival mask. gum.
[000305] 57. The method according to any of the preceding items, wherein a virtual hole is provided in said gingival part of the virtual model of the set of teeth, where said virtual hole is such that a corresponding hole is configured in the physical model of the set of teeth to match a part of said restoration configured to fit in the gingival part of the physical model of the set of teeth.
[000306] 58. The method according to item 57, wherein said virtual hole is configured to allow an implant analog to be manually inserted into the corresponding hole of the physical model of the set of teeth.
[000307] 59. The method according to item 57 or 58, in which the virtual orifice and/or said implant analog are configured so that said implant analog can be inserted only in the correct anatomical position and orientation in the gingival part of the model.
[000308] 60. The method according to any of items 57 to 59, wherein said implant analog is configured to have a shape with reduced transverse rotation symmetry, such as a symmetry of order N, where N is a number integer under 25
[000309] 61. The method according to any of the preceding items, in which some steps of the method are implemented by computer.
[000310] 62. The method according to any of the preceding items, in which the gingival part of the virtual model of the set of teeth, is configured to ensure that a corresponding ejection hole in the physical model of the set of teeth is in fluid connection with said hole so that a restoration or an implant analog can be accessed through said ejection hole to be ejected from the gingival portion of the physical model of the set of teeth.
[000311] 63. The method according to any of the preceding items, wherein the implant analog is configured to comprise a stop section with a smaller cross-sectional area at its distal end, wherein preferably said stop section is centrally disposed around the longitudinal axis of the implant analog.
[000312] 64. The method according to any of the preceding items, wherein the virtual hole defined in the gingival part of the virtual model of the set of teeth is configured to ensure that the corresponding hole in the physical model of the set of teeth has rounded edges at its distal end.
[000313] 65. The method according to any of the preceding items, wherein the method comprises providing a covering that in cooperation with the first gingival region is configured to delimit the second gingival region.
[000314] 66. The method according to item 65, wherein the cover comprises an opening configured to allow the injection of said second material into said second gingival region in a physical model manufactured from the virtual model of the teeth.
[000315] 67. The method according to item 65 or 66, wherein a surface of the covering facing said second gingival region is formed as said third surface.
[000316] 68. The method according to any of the preceding items, wherein the method comprises designing and configuring the model to be manufactured through a specific manufacturing process.
[000317] 69. A method for generating a virtual model of a set of teeth to fabricate a physical model of the set of teeth, where the method comprises:- obtaining a virtual model of the set of teeth, wherein the model comprises a gingival part that comprises a gum; e- obtain a virtual model of a restoration configured to be placed in its correct anatomical position relative to said gingival part of the model; where the gingiva surface defines a first surface on said restoration; and modifying the gingiva on said restoration so that the gingiva modifying surface defines a second surface on said restoration, wherein the second surface is configured to avoid an overlap between the volume of the restoration and the volume of the gingival portion of the model.
[000318] 70. A method to adjust a virtual model of a set of teeth, where the virtual model of the set of teeth serves to fabricate a physical model of the set of teeth, where the method comprises:- obtaining a preset configuration a virtual model of the set of teeth, wherein the virtual model of the set of teeth comprises a gingival portion; e- obtain a virtual model of a restoration configured to be arranged in its correct anatomical position relative to said gingival part of the model, where the volume of the gingival part of the virtual model of the set of teeth and the volume of the virtual model of the restoration overlap when the restoration is placed in the correct anatomical position; and - adjust a portion of the gingival part of the virtual set of teeth model disposed in said restoration to provide a post-fit setting of the virtual set of teeth model, wherein the post-fit setting of the gingival part of the model is set to avoid overlap between the volume of the virtual model of the restoration and the volume of the gingival part of the virtual model of the set of teeth.
[000319] 71. The method according to item 70, in which the adjustment of the gingival part comprises configuring the shape of the gingival part so that overlapping between the volumes is avoided.
[000320] 72. The method according to item 71 or 72, wherein the method comprises configuring the gingival material in the restoration to be soft enough so that a restoration can deform the gingival portion.
[000321] 73. A method for generating a physical model of a set of teeth, where the method comprises: - obtaining at least a three-dimensional representation of the set of teeth; - generating and modifying a virtual model of the set of teeth from said by less a three-dimensional representation, in which the virtual model of the set of teeth comprises a gingival part; and - modifying the gingival portion to allow insertion of a restoration in a region of the virtual set of teeth model configured for insertion of a restoration. - fabricating said physical model from said virtual set of teeth model.
[000322] 74. The method according to any of the preceding items, in which the method comprises manufacturing the physical model by means of printing or three-dimensional milling.
[000323] 75. The method according to item 73 or 74, wherein the physical model may be fabricated using a casting mold to cast an at least partially soft mold as part of the physical model of the set of teeth.
[000324] 76. The method according to item 75, wherein a foundry mold CAD model is generated as an impression of at least a part of the virtual model, wherein said foundry mold CAD model thus comprises the geometry negative of the set of teeth.
[000325] 77. The method according to any of items 73 to 76, wherein said second material is softer and more compressible than said first material under ambient conditions.
[000326] 78. A physical model of a set of teeth, in which the physical model is manufactured from a virtual model of the set of teeth generated and modified by the method according to any of items 1 to 77.
[000327] 79. An eject tool for ejecting a restoration according to any of the preceding items, when the restoration is laid out on a physical model of a set of teeth according to any of the preceding items.
[000328] 80. The ejection tool according to item 79 which comprises an elongated component which is adapted to fit into a hollow hole in the gingival part of the model.
[000329] 81. The ejection tool according to item 79 or 80, comprising an elongated component that is adapted to fit into a blind hole and/or a hollow hole in the restoration.

权利要求:
Claims (20)
[0001]
1. Method for generating and modifying a virtual model of a set of teeth, wherein said set of teeth comprises a region configured for insertion of a restoration, the region being located in a gingival part of the set of teeth, wherein the method comprises: - obtaining at least a three-dimensional representation of the set of teeth; - generating a virtual model of the set of teeth (10) of said three-dimensional representation, wherein the virtual model of the set of teeth (10) comprises a gingival part, said gingival part comprises a virtual region corresponding to said region configured for the insertion of a restoration and in which at least part of the gingiva surrounds said region; obtaining a virtual model of said restoration (14); and - characterized by modifying the gingival part of the virtual model of the set of teeth (10) based on the virtual model of said restoration (14) so that the virtual model of the restoration can be inserted virtually within said virtual region with no overlap between the volume of said virtual model of the restoration and the volume of said gingival part of the virtual model of the set of teeth (10).
[0002]
2. Method according to claim 1, characterized in that modifying the gingival part of the virtual model of the set of teeth (10) comprises digitally cutting a part of the gingiva or digitally repositioning the gingiva around the restoration (14) of so that the volume of the restoration and the volume of the gingiva do not overlap.
[0003]
3. Method according to claim 1, characterized in that the method comprises subtracting the virtual model of the restoration (14) or the volume delimited by a displacement surface from the virtual model of the set of teeth (10).
[0004]
4. Method according to claim 3, characterized in that a displacement is provided between the contiguous surfaces of the virtual model of the restoration (14) and the gingival part of the virtual model of the set of teeth (10).
[0005]
5. Method according to claim 1, characterized in that the gingival part of the virtual model of the set of teeth (10) defines a first surface (15) in the region configured for insertion of a restoration and in which to modify the model The virtual set of teeth (10) comprises replacing said first surface (15) with a second surface (17), wherein said second surface (17) is molded so that the virtual model of said restoration (14) can be virtually disposed in said virtual implant region with no overlap with the modified virtual model of the set of teeth.
[0006]
6. Method according to claim 5, characterized in that at least a section of said second surface (17) is defined by displacing part of the surface of the virtual model of the restoration (14).
[0007]
7. Method according to claim 1, characterized in that the method comprises determining an insertion path (20) for the restoration.
[0008]
8. Method according to claim 7, characterized in that the method comprises identifying a circumference line (21) for the restoration.
[0009]
9. Method according to claim 8, characterized in that an extrusion volume is defined by the insertion path (20) and the circumference line (21), and in which to modify the gingival part of the virtual model (10 ) comprises subtracting the extrusion volume from the virtual model (10).
[0010]
10. Method according to claim 5, characterized in that the gingival part of the virtual model of the set of teeth (10) after virtually adding the material to the gingiva defines a third surface (18) in the region configured for insertion of a restoration , wherein the gingival portion of the virtual set of teeth (10) is divided into a first and a second gingival region by the second surface (17) with the second gingival region (19) disposed between the second surface (17) and the third surface (18), wherein the second surface (17) forms an interface between the first and second gingival region.
[0011]
11. Method according to claim 1, characterized in that a first three-dimensional representation of the set of teeth is obtained by sweeping the set of teeth of the patient with a scanning body disposed in said region of the implant.
[0012]
12. Method according to claim 11, characterized in that said virtual model of the set of teeth (10) is generated at least in part from said first three-dimensional representation.
[0013]
13. Method according to claim 11, characterized in that a second three-dimensional representation of the set of teeth is obtained by sweeping the set of teeth of the patient with the emergence profile in said region of the implant being visible.
[0014]
14. Method according to claim 13, characterized in that said virtual model of the set of teeth (10) is generated at least in part from said second three-dimensional representation.
[0015]
15. Method according to claim 11, characterized in that the method comprises generating a first virtual model of the set of teeth (10) from said first three-dimensional representation of the set of teeth.
[0016]
16. Method according to claim 15, characterized in that the method comprises generating a second virtual model of the set of teeth (10) from said second three-dimensional representation of the set of teeth, and combining the first and second models set of teeth to generate said virtual model of set of teeth (10).
[0017]
17. Method according to claim 15, characterized in that a virtual model of the scan body is provided and virtually aligned with the first virtual model of the set of teeth (10) to determine an orientation and position of the implant.
[0018]
18. Method according to claim 1, characterized in that the method comprises digitally repositioning the gingival part of the model around the restoration.
[0019]
19. Method according to claim 18, characterized in that digitally repositioning the gingival part of the virtual model of the set of teeth (10) comprises digitally moving the gingiva away from the virtual model of the restoration.
[0020]
20. Method for generating a physical model of a set of teeth, wherein the method comprises: - obtaining at least a three-dimensional representation of the set of teeth; - generating a virtual model of the set of teeth (10) of said at least one representation three-dimensional, in which the virtual model of the set of teeth (10) comprises a gingival part; - characterized by modifying the gingival part based on a virtual model of a restoration (14) to allow the insertion of the restoration in a region of the virtual model the set of teeth (10) configured for insertion of a restoration so that the volume of the restoration and the volume of the gum do not overlap; and - fabricating said physical model from said virtual model of the set of teeth (10).

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法律状态:
2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-03-24| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-04-13| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-06-15| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 23/02/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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US201161445758P| true| 2011-02-23|2011-02-23|

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US61/445,758|2011-02-23|

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DKPA201100126|2011-02-23|

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DKPA201100126|2011-02-23|

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US201161466187P| true| 2011-03-22|2011-03-22|

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US61/466,187|2011-03-22|

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DKPA201100202|2011-03-22|

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DKPA201100199|2011-03-22|

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DKPA201100202|2011-03-22|

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DKPA201100199|2011-03-22|

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PCT/DK2012/050062|WO2012113407A1|2011-02-23|2012-02-23|Method of modifying the gingival part of a virtual model of a set of teeth|

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