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    • 专利摘要:
    The invention relates to a process for manufacturing a dental prosthesis (9) removable by molding comprising: - a step of numerical modeling of a prosthesis model (10 '); - A step of producing a mold (3, 4) comprising a lower half-shell (3) corresponding to a teeth part of the prosthesis and an upper half-shell (4) corresponding to a gum part of the prosthesis, the two half-shells being assembled by joining one another to thus forming an impression of the prosthesis, the step comprising a numerical modeling of a model of the mold, followed by additive manufacturing of at least the lower half-shell and a step of producing the prosthesis comprising successively at least one supply of at least one artificial tooth, a positioning of the artificial tooth in a housing of the lower half-shell (3), a mold assembly and a casting filling material in the mold. Removable dental prosthesis (9) obtained by this method.
    公开号:FR3053241A1
    申请号:FR1656228
    申请日:2016-06-30
    公开日:2018-01-05
    发明作者:Alexandre Forest
    申请人:Mojito；
    IPC主号:
    专利说明:

    ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number:
    (to be used only for reproduction orders)
    ©) National registration number
    053 241
    56228
    COURBEVOIE © Int Cl 8 : A 61 C 13/00 (2017.01)
    PATENT INVENTION APPLICATION
    A1
    ©) Date of filing: 30.06.16. ©) Applicant (s): MOJITO— FR. (© Priority: @ Inventor (s): FOREST ALEXANDRE. ©) Date of availability of the request: 05.01.18 Bulletin 18/01. ©) List of documents cited in the preliminary search report: See the end of this booklet (© References to other related national documents: ®) Holder (s): MOJITO. ©) Extension request (s): (© Agent (s): SANTARELLI.
    loAJ METHOD OF MANUFACTURING A REMOVABLE DENTAL PROSTHESIS BY MOLDING USING A MOLD MADE IN ADDITIVE MANUFACTURING.
    FR 3 053 241 - A1 _ The invention relates to a method of manufacturing a dental prosthesis (9) removable by molding comprising:
    - a step of numerical modeling of a prosthesis model (10 ');
    a step for producing a mold (3, 4) comprising a lower half-shell (3) corresponding to a teeth part of the prosthesis and an upper half-shell (4) corresponding to a gum part of the prosthesis, the two half-shells being assembled by joining one to the other thus forming an imprint of the prosthesis, the step comprising a digital modeling of a model of the mold, followed by additive manufacturing of at least the lower half-shell , and
    a step of producing the prosthesis successively comprising at least one supply of at least one artificial tooth, positioning of the artificial tooth in a housing of the lower half-shell (3), an assembly of the mold and a casting of a filling material in the mold.
    Removable dental prosthesis (9) obtained by this process.


    The present application relates to a method of manufacturing a removable dental prosthesis using a mold produced at least in part in additive manufacturing.
    It relates more particularly to a method of manufacturing a removable dental prosthesis by molding.
    A denture is a replacement for at least some of the natural teeth.
    A removable prosthesis is a prosthesis that can be removed from the mouth for daily maintenance or simply for sleeping.
    We speak of a complete removable prosthesis, or of dentures, when the prosthesis replaces all of the teeth, whether it is the upper jaw for an upper denture or the lower jaw for a lower denture.
    We speak of a removable partial denture, when it is only a question of replacing one or more teeth.
    A removable partial prosthesis comprises for example a support bar (or structure) (such as a frame) and a resin part typically of acrylic resin (gum and tooth (s)). A metal frame, or stellite, can thus be used to support the artificial teeth which are positioned at the location of the edentulous. This rigid metal-based part (usually based on chromium -cobalt - molybdenum) rests both on the remaining teeth and on the mucous membranes, mainly the gums.
    The removable partial prosthesis can also be a bridge (or dental bridge), consisting of one or more artificial teeth suspended and connected to remaining teeth or abutments. In this case, the support bar is made of metal, ceramic, a mixture of metal and ceramic or composite resin.
    A removable prosthesis can also be held in place in the mouth by at least one implant. An implant is a metal element, possibly fixed via a screw, in the bone, to replace the tooth root of a tooth. The metal currently used is most often titanium. The number of implants placed in the mouth varies according to the size of said prosthesis. The presence of several implants most often requires the presence of a retention bar which rests on the implants, the prosthesis itself then being fixed to the retention bar most often by at least one fixing means.
    The manufacture of removable dental prostheses requires the implementation of a protocol comprising a succession of very precise steps, among which: primary impression taking with gingival contour analysis, secondary impression (or recovery). At least two fingerprints are required to record the position of the gum, tongue, lips and cheeks very precisely. These steps are mandatory before arriving at the stage of casting the monomer (which will form the resin of the prosthesis) in a plaster mold, in which artificial teeth have been previously laid out or are subsequently bonded.
    These are time-consuming steps which considerably delay the effective completion of the prosthesis. Thus, it is typically necessary to carry out at least five clinical sessions before the installation of a total removable prosthesis, comprising at least for example the taking of the primary and secondary impressions, the inter-maxillary report, the fitting of the wax assembly, the verification occlusion and equilibration.
    In addition, once the prosthesis is in place, if a problem appears, it is most often necessary to take the secondary impression to make the necessary corrections.
    Therefore, making removable dentures is a long, cumbersome and daunting process that puts off many dental technicians.
    The object of the present application therefore aims to propose an improved process, in particular in terms of time savings and ease of manufacture, in a context of automation or even industrialization, of at least one removable dental prosthesis.
    To this end, the invention relates, in a first aspect, to a method of manufacturing a removable dental prosthesis by molding, said method comprising the following successive steps:
    - a step of digital modeling of a prosthesis model, the prosthesis model representing the prosthesis to be produced and comprising a gum part and a teeth part;
    a step for producing a mold from the prosthesis model, said mold comprising two half-shells, a lower half-shell comprising an imprint of the teeth part of the prosthesis to be produced, and an upper half-shell comprising a imprint of the gum part of the prosthesis to be produced, the two half-shells being configured to be assembled by joining to one another, the imprints of each half-shell forming by assembly an imprint of the prosthesis to be produced, l step of producing a mold comprising a sub-step of at least partial digital modeling of a mold model as a function of the prosthesis model, followed by a sub-step of additive manufacturing of at least the half-shell bottom of the mold depending on the mold model,
    a step of producing the prosthesis successively comprising at least: a sub-step of supplying at least one artificial tooth, a sub-step of positioning the artificial tooth in a housing of the lower half-shell, a sub- mold assembly step and a sub-step of pouring a filling material into the mold.
    By "shell" is meant according to the invention a set composed of two parts, or half-shells, which are used to make the mold. According to the invention, at least one of the two half-shells is produced by additive manufacturing. The qualifiers "lower" and "upper" are here arbitrary so as to easily identify each half-shell.
    By "additive manufacturing" is meant according to the invention a manufacturing process for adding material, most of the time computer-assisted. It is defined by the ASTM standardization body as being a process for shaping a part by adding material, by stacking successive layers, in opposition to processes by removing material, such as machining. It is also the name given to three-dimensional printing technology (3D printing).
    The method of manufacturing a removable dental prosthesis according to the invention, comprising the production of a mold at least partially by additive manufacturing, is advantageously easy and rapid. In addition, the precision of the additive manufacturing techniques allows a perfect adequacy, much more precise than by the usual methods, of the prosthesis to the environment in which it is intended to be inserted.
    The upper half-shell is produced either, preferably, by additive manufacturing, or by another process such as plaster molding. In the latter case, the half-shell may be full.
    According to one embodiment, the step of making the mold is such that the digital modeling sub-step produces a model of the partial mold, ie relating only to the lower half-shell, as a function of the prosthesis model, and the sub- additive manufacturing stage produces this partial mold according to the mold model. However, this embodiment is not preferred.
    According to a preferred embodiment, the step of making the mold is such that the digital modeling sub-step realizes a model of the complete mold as a function of the prosthesis model, and the additive manufacturing sub-step makes the manufacturing of the whole mold according to the mold model. This corresponds to the case where the upper half-shell is also produced by additive manufacturing. But it is also possible that the lower half-shell is produced by additive manufacturing and that the upper half-shell is produced by a more conventional technique, for example by means of a plaster mold.
    The positioning of artificial tooth (s) in a housing of the lower half-shell produced by additive manufacturing does not require that the artificial tooth is entirely included in the housing. What matters is that the tooth is positioned / inserted at least partly in this housing because it is a support for this tooth. On the other hand, the artificial tooth can overflow so as to also be partly in the imprint of the other half-shell once the mold has been assembled.
    The removable dental prosthesis obtained according to the method of the invention is a total prosthesis or else a partial prosthesis.
    The removable dental prosthesis obtained according to the method of the invention may include a support bar (or structure), for example metallic (stelite). Such a stellite can be a frame and / or a set of hooks.
    The support bar can be inserted at least partially into the prosthesis during molding, or else be fixed to the prosthesis once it has been produced and removed from the mold. In the second case, different support means, such as notches, and / or fixing spaces are provided in the prosthesis, generally in the less technical areas, so as to be able to fix it to the support bar. These arrangements are preferably provided during at least partial computer-aided design (i.e. modeling), and are found in the mold during its additive manufacturing. They are then present in the prosthesis when it is actually produced. They can also be produced on the prosthesis once it has been removed from the mold. Such arrangements can also make it possible to fix the prosthesis on at least one implant by means of a retention bar if necessary.
    The support bar is preferably incorporated into the mold before the casting step, by a sub-step of supplying the support bar followed by a sub-step of positioning the support bar in one of the half-shells. , the other half-shell may also include receiving means, such as notches and / or spaces, for at least partially receiving the support bar during assembly. These two sub-steps are carried out before or after one or more of the artificial tooth supply and positioning sub-steps. A person skilled in the art is able to adapt the succession of sub-stages preceding the assembly of the mold in the most appropriate manner for the production of the prosthesis.
    According to another embodiment, the prosthesis intended to be fixed in the mouth with the use of at least one support bar.
    According to one embodiment, the prosthesis is directly usable without the use of a support bar and could for example be held only by mucous and / or palatal supports.
    According to a preferred embodiment, the sub-step of additive manufacturing of the mold is carried out by at least one of the following techniques: stereolithography (or SLA, acronym of the English terms "stereolithograph apparatus"); digital light processing (or DLP, acronym for the English terms "digital light projecting"); deposit of molten filament (or FDM®, acronym of the English terms “fused deposition modeling”); PolyJet® process.
    Preferably, the additive manufacturing sub-step of the mold is carried out by the PolyJet® process or by stereolithography (SLA). Even more preferably, the additive manufacturing sub-step of the mold is carried out by the PolyJet® process.
    Stereolithography (SLA) is an additive manufacturing technique using the principle of photopolymerization of acrylate or epoxy monomers or acrylonitrile butadiene styrene (ABS) photopolymerization with great precision. This technique is briefly recalled here. A three-dimensional digital file, or model, in .STL format is generally transmitted to an additive manufacturing printer (or three-dimensional printer) SLA where software cuts the model into several printing layers of generally fixed thickness. An object is then printed from a horizontal platform immersed in a bath of monomeric liquid. To this end, a photo-polymerization of the monomer is caused by a ray of ultraviolet laser light, controlled using deflectors formed from very precise mirrors. The laser beam scans the surface of the liquid monomer according to the digital three-dimensional model transmitted to the printer. Once a layer of material is solidified, i.e. a scan of the layer is carried out, the platform descends from the value of the thickness of the next layer, and a new section is solidified. This operation is repeated as many times as necessary to obtain the complete volume of the object. A post-treatment in the oven may be necessary to finish the polymerization, and to maximize the resistance of the material. Before or after this post-treatment, the object obtained is most often cleaned using a solvent.
    Digital light processing (or DLP) is a technique using the same technology as that of video projectors. The principle is similar to ALS, but here it is light that solidifies a liquid monomer (and not a laser). UV (ultraviolet) light generated by a suitable device is reflected by a matrix made up of a large number of orientable mirrors and projects an image corresponding to the shape of the printed layer. Light strikes the monomer in a container to solidify it. The treatment is done layer by layer, as for ALS.
    Deposition of molten filament (FDM®, from Stratasys) is a process that allows the use of a wide variety of materials and colors. The principle is that the material, most often presented in the form of coils, passes through an extrusion nozzle heated between 170 and 260 ° C. This material is made and deposited on a support, called a printing plate, in layers, the fineness of which varies depending on the nature of the material and the settings. It is typically 0.02 mm. After a first layer is finished, the print bed goes down to receive a second layer and so on. According to a variant, the printing plate can also be heated to compensate for the deformation of the thermal shock undergone by the plastic because it passes from more than 200 ° C. to ambient temperature almost instantaneously. Alternatively, at least of it extrusion are present, allowing an object to be printed in at least two different colors or at least two different materials.
    The so-called PolyJet® process (from the company Objet) is a photopolymerization process, just like ALS. The principle is that jets of material are projected onto the printing medium, in layers defined by the printing software. After each spray, the polymer is solidified thanks to a UV ray.
    According to a preferred embodiment, the additive manufacturing material is chosen from the group formed by acrylic monomers, epoxy monomers, and acrylonitrile butadiene styrene (ABS). Even more preferably, the additive manufacturing material is an acrylic monomer such as methyl methacrylate. This is mainly the case when using the PolyJet®, SLA and DLP processes.
    According to another preferred embodiment, the additive manufacturing material is chosen from the group formed by the polymers polylactic acid (PLA), polyvinyl alcohol (PVA), acrylonitrile budadiene styrene (ABS) and ethylene terephthalate (PET). This is mainly the case when using the deposit of molten filament.
    According to a preferred embodiment, the step of effective production of the prosthesis is preceded by a step of taking an impression. The impression-taking step is well known to those skilled in the art. The impression-taking step is thus carried out, either on a plaster model using a table scanner, or, preferably, directly using an intraoral scanner.
    The material used to produce the prosthesis, in particular a part of the prosthesis representing the gum, is usually an acrylic monomer such as methyl methacrylate.
    But it can also be any monomer, also called "resin" or even "dental resin" in common parlance of prosthetists, known to those skilled in the art for making a prosthesis. We often speak in this case of self-curing resin. The polymerization is carried out in a current manner and known to a person skilled in the art. For example, the polymerization is carried out in air, after optional addition of a catalyst or hardener, at ambient temperature of around 23 ° C., for a period of several minutes or even tens of minutes. Typically this duration (or setting time) is 6 to 9 minutes.
    The polymerization can also be carried out in a controlled manner by means of a pressure polymerization enclosure, for example of the Palamat® elite type (from the company Heraeus Kruzer) for several minutes, for example 10 minutes. This enclosure produces a water bath, possibly under pressure, with typically a water temperature of 55 ° C and a pressure of 2 bar. The use of this device is particularly advantageous to avoid the presence of bubbles in the prosthesis.
    According to a preferred embodiment, the step of effective production of the prosthesis is followed by at least one step of demolding and / or finishing.
    By "A and / or B >> here is meant" A, or else B, or else A and B >>.
    By "demolding" here is meant obtaining the prosthesis from the mold. The release can be total or, more often, partial. Indeed, there are frequently undercuts, in which case the shell or shells obtained by additive manufacturing are broken to obtain the prosthesis.
    All the usual stages of finishing of the technique and well known to the prosthetist such as sanding, polishing, buffing and glazing are possible, in particular so that the surface state of the prosthesis does not produce an irritant contact once inserted in its environment .
    The invention relates, in a second aspect, to a removable dental prosthesis obtained by a manufacturing process according to the invention.
    The prosthesis can be a complete prosthesis or a partial prosthesis.
    According to one embodiment, the prosthesis includes a support bar, for example made of metal (stellite), typically of cobalt chromium, as is known in the art. However, such a support bar can also be produced in additive manufacturing, or else by casting in lost wax.
    As indicated above, the prosthesis may include attachment spaces intended to allow its attachment to at least one implant, possibly by means of a retention bar.
    The process for manufacturing a removable dental prosthesis according to the invention will be better understood from the detailed description which follows, given by way of non-limiting example, with reference to the appended drawings illustrating three embodiments: a first illustrated embodiment in Figures 1 to 11, a second embodiment illustrated in Figures 12 to 16, and a third embodiment illustrated in Figures 17 to 28. Figures 1 to 28 are as follows:
    - First embodiment of the invention:
    - Figure 1 schematically shows a perspective view of a dental prosthesis model, according to a first embodiment of the invention;
    - Figure 2 schematically shows a perspective view of the model of Figure 1 in which an artificial delimitation allows separation into two parts (teeth part and gum part);
    - Figure 3 shows schematically a perspective view of the model of Figures 1 and 2 after the separation into two parts of the part of Figure 2;
    - Figure 4 schematically shows an embodiment of a lower half-shell mold model from the first of the two parts of Figure 3, in perspective view from above (Figure 4A) and from below (Figure 4B);
    - Figure 5 schematically shows an embodiment of a model of upper mold half-shell from the second of the two parts of Figure 3, in perspective view from above (Figure 5A) and from below (Figure 5B);
    - Figure 6 schematically shows a perspective view of the mold model produced by assembling the two models of half-shells by joining one to the other making the imprint of the model;
    - Figure 7 shows schematically a perspective view of a half-shell corresponding to the teeth part produced by additive manufacturing from the model of the first half-shell of Figure 4, and also represents the sub-step of supplying at least one tooth 20 as well as a sub-step for positioning at least part of this tooth 20;
    - Figure 8 schematically shows a perspective view of the half-shell corresponding to the gum part produced by additive manufacturing from the second half-shell model of Figure 5;
    - Figure 9 is a schematic perspective view of the mold consisting of the half-shells of Figures 7 and 8, and also represents the casting sub-step of the step of effective realization of the dental prosthesis;
    - Figure 10 schematically shows a perspective view of the demolding step of the dental prosthesis produced by the manufacturing process during the casting substep illustrated in Figure 9; and
    - Figure 11 schematically shows a perspective view of two total dental prostheses, an upper jaw prosthesis obtained at the end of the step in Figure 10, and a lower jaw prosthesis obtained in a similar manner.
    - Second embodiment of the invention:
    - Figure 12 schematically shows a perspective and exploded view of three parts forming a dental prosthesis mold obtained after modeling, according to a second embodiment of the invention;
    - Figure 13 schematically shows in detail one of the parts (teeth part) of the dental prosthesis mold of Figure 12;
    - Figure 14 schematically shows a perspective view of the dental prosthesis mold of Figures 12 and 13 after fixing one piece of the three pieces on another of the three pieces;
    - Figure 15 shows schematically a perspective view of the mold after assembly;
    - Figure 16 shows schematically another perspective view, complementary to Figure 15, of the mold after assembly;
    - Third embodiment of the invention:
    - Figure 17 schematically shows a perspective view of a first part (gum part) of a dental prosthesis mold model, according to a third embodiment of the invention;
    - Figure 18 schematically shows a perspective view of a second part (support bar) of the dental prosthesis mold model of Figure 17;
    - Figure 19 shows schematically a perspective view of the first and second parts of the dental prosthesis mold model, the second part (support bar), reworked;
    - Figure 20 shows schematically a perspective view from above of a third part (teeth part) of the dental prosthesis mold model of Figures 17 to 19;
    - Figure 21 shows schematically a perspective view from below of the third part of Figure 20 reworked;
    - Figure 22 shows schematically a perspective view from above (Figure 22A) and from below (Figure 22B) of a lower half-shell corresponding to the gum part produced by additive manufacturing from the half-shell model of Figures 17 and 20;
    - Figure 23 shows schematically a perspective view from above (Figure 23A) and from below (Figure 23B) of an upper half-shell corresponding to the teeth part produced by additive manufacturing from the half-shell model of Figures 18 and 20;
    - Figure 24 schematically shows a perspective view from above of the half-shell of Figure 23 during the substep of supplying an artificial tooth 45 as well as during the substep of positioning another tooth artificial 44.
    - Figure 25 shows schematically a perspective and exploded view of the assembly of the mold formed by the half-shells of Figures 22 and 23 and a support bar corresponding to the part of Figures 19 and 20;
    - Figure 26 shows schematically a cross-sectional view of the mold after assembly;
    - Figure 27 shows schematically a perspective view of the mold after assembly and before pouring the resin;
    - Figure 28 shows schematically a perspective view of the release of a prosthesis thus obtained after casting the resin.
    In the Figures, identical elements are identified by identical reference numerals.
    The first embodiment explains all the steps of the method according to the invention, with the exception of the impression taking step. The second embodiment is described only with regard to the modeling, manufacture and assembly of the mold, the steps of casting the filling material in the mold for effective manufacture of the dental prosthesis, then of demolding of the dental prosthesis thus obtained, being transposable from the first embodiment. The third embodiment explains all the steps of the method according to the invention, with the exception of the impression taking step.
    - First embodiment of the invention
    Figures 1 to 10 according to the first embodiment of the invention illustrate the case of a method of manufacturing a total dental prosthesis, here upper jaw. Figures 1 to 6 represent phases of computer-aided design, which generates models, while Figures 7 to 10 represent actual manufacturing phases proper, comprising the actual production by additive manufacturing of the mold and then the actual production of the dental prosthesis thanks to the mold. Figure 11 illustrates the case of two total dental prostheses, upper jaw and lower jaw, obtained by the method of the invention, the dental prosthesis of lower jaw having been produced in the same way as the dental prosthesis manufactured during the steps illustrated in Figures 1 to 10.
    As illustrated in FIG. 1, a digital file representing a model 10 of a three-dimensional removable dental prosthesis was produced in .STL format from computer-aided design (CAD) software, such as SolidWorks®, Sculpt® or Maya® type. The three-dimensional imprint of model 10 in Figure 1 will then be processed by generalist software, of the Magies® type, or by specific software, for example of the 3shapes®, Exocad® or Dental wings® type, to reconstruct a dentition as well than gingival profiles.
    This step of producing the three-dimensional model of dental prosthesis was preceded by an impression taking step (not illustrated) carried out either on a plaster model using a table scanner, or, preferably, directly using a intraoral scanner.
    The following phases, illustrated by Figures 2 to 6, illustrate the sub-step of three-dimensional modeling of the mold.
    Figure 2 shows the model 10 of Figure 1, in which a delimitation 11 has been made, thus separating the model into two parts, an upper part 12 called the gum part and a lower part 13 called the teeth part.
    Any form of delimitation can be envisaged, if indeed the major part, even all of the teeth, is present in the lower part. According to a preferred embodiment, the delimitation is carried out substantially in a plane (called joint plane) which facilitates handling while allowing, thereafter, to produce two half-shells easily joinable to each other according to this plan.
    Figure 3 shows the model 10 of Figure 1, after separation of the upper part; or gum part, 12, and the lower part, or teeth part, 13, according to the delimitation 11. This gives a model 10 'as shown, separated into two parts, namely a gum part 12' and a teeth part 13 '.
    Figure 4 schematically shows an embodiment of a model of the first half-shell 130 of the mold corresponding to the teeth part 13 ’of the model 10’. This model of first half-shell 130 was produced in negative of part 13 ’of FIG. 3, which thus comprises a housing for the teeth, in perspective view from above (FIG. 4A) and from below (FIG. 4B). The external surface of the teeth part 13 ′ of the model 10 ′ in FIG. 3 corresponds in all points to the internal surface of the half-shell 130. The model of the first half-shell, or offset, 130 is hollow and fits in a three-dimensional U-shaped volume, substantially taking up the shape of an upper jaw.
    The thickness of this model, or skin, is approximately 0.5 mm. Advantageously, this thickness is made in homothety by over-thickness with respect to the exterior surface of the model 10 ’in Figure 3e.
    This thickness is constant thanks to the use of additive manufacturing, which saves material. Additive manufacturing is particularly interesting from this point of view.
    The depth P 5 of the U is here of dimension greater than or equal to the height of the teeth. It extends between two substantially parallel planes, one of which corresponds to the plane of delimitation 11 and is materialized by a wall 150c, the other (virtual) plane being substantially parallel to the plane 150c. The first half-shell 130 has two centering holes 150a and 150b which are located in the rear part, that is to say on the two ends of the U. The centering holes 150a and 150b extend back from the wall 150c towards the interior of the first half-shell model 130. Preferably, they are of length less than or equal to the depth of the U.
    Figure 5 schematically shows an embodiment of a second half-shell model 140 of the mold corresponding to the gum part 12 ’of the model 10’. This second half-shell model 140 was produced in negative of part 12 ′ of FIG. 3, which thus constitutes an imprint of part of the gum, in perspective view from above (FIG. 5A) and from below ( Figure 5B). The external surface of the gum part 12 ′ of the model 10 ′ in FIG. 3 corresponds in all points to the internal surface of the half-shell 140. The model of the second half-shell 140, or offset, is hollow and fits in a three-dimensional U-shaped volume.
    The depth P 6 of the U is here of dimension greater than or equal to the height of the gum. It extends between two substantially parallel planes. One of these planes corresponds to the plane of delimitation 11 and is materialized by a wall 160c, the other (virtual) plane being substantially parallel to this first plane 160c. The second half-shell 140 comprises two centering pins 160a and 160b which are located in the rear part, that is to say on the two ends of the U. The pins 160a and 160b project from the wall 160c towards the outside of the second half-shell model 140 and have a length substantially identical to that of the respective centering holes 150a and 150b, with which they are respectively configured to cooperate.
    FIG. 6 schematically represents a perspective view of the mold model 8 produced by assembling the two models of first and second half-shells 130 and 140 by joining to each other thanks to the (virtual) insertion of the pins of centering 160a and 160b in the respective holes 150a and 150b. The mold model 8 thus makes the imprint (or the negative) of the offset 10 ’. The production of this mold model 8 marks the end of the CAD phase of the process.
    The vents and tap hole (s) are not shown in Figures 4 to 6 for the sake of simplification but they are preferably also modeled.
    FIG. 7 schematically represents a perspective view of a first half-shell 3 corresponding to the teeth part produced by additive manufacturing, for example by SLA, from the model of first half-shell 130 of FIG. 4.
    FIG. 8 schematically represents a perspective view of a second half-shell 4 corresponding to the gum part produced by additive manufacturing, for example by SLA, from the second half-shell model 140 of FIG. 5.
    Figure 9 is a schematic perspective view of the mold 5 formed by assembling the first half-shell 3 of Figure 7 and the second half-shell 4 of Figure 8, making the imprint of the model 10 '.
    The vents are not shown in Figures 7 and 8 for the sake of simplification. However, they are shown in Figure 9.
    In FIG. 7 are also shown artificial teeth 20, illustrating both a substep of supplying teeth 20 as well as a substep of positioning these teeth 20 in a corresponding housing of the first half-shell 3 .
    The first half-shell 3 has holes 15a and 15b respectively for centering pins 16a and 16b of the second half-shell 4.
    In FIG. 8, it can be seen that the second half-shell 4 comprises a supply channel 17, also designated by "tap hole" intended to allow the pouring of a filling material (which is in liquid form or in powder form) in the imprint formed by the two half-shells 3, 4 assembled. The feed channel 17 is shown here as central (relative to the U shape of the model), preferably leading to a part of the least technical footprint possible. It comprises a supply crucible 17a and a pouring channel 17b opening on the one hand into the cavity of the second half-shell 4, and on the other hand into the supply crucible 17a. The filling material is introduced through the supply crucible 17a during casting.
    However, any other location of the supply channel 17 can be envisaged in the context of the invention, according to a variant not shown.
    In FIG. 9, the half-shells 3 and 4 have been joined to one another by assembly and insertion of the centering pins 16a and 16b in the centering holes 15a and 15b, after positioning of the set of teeth 20 in the recesses of the imprint of the first half-shell 3. We also see the presence of two vents 18a and 18b, here formed vertically in the upper part of the second half-shell 4.
    Figure 9 illustrates a casting substep. Thus, a filling material is poured into the feed channel 17, according to the arrow F. During this pouring sub-step, the air present in the mold 5 is expelled by the two vents 18a and 18b, according to the arrows respective Fa and Fb.
    Consequently, a dental prosthesis 9 of the upper jaw was produced by molding within the mold 5.
    FIG. 10 schematically represents a perspective view of the demoulding of the prosthesis 9. The dental prosthesis 9 comprises, by definition, a gum part 90 and a teeth part 91, itself comprising the teeth
    20. The demoulding carried out here is total by the application of two forces carrying out two opposite withdrawal movements, illustrated by the arrows h and f 2 .
    The prosthesis 9, once removed from the mold, advantageously undergoes sanding (at the places where the feed channel and the vents open out), and any possible finishing step known in the art.
    Figure 11 schematically shows a perspective view of two total dental prostheses 9 and 7, the upper jaw prosthesis 9 being obtained at the end of the step of Figure 10, and the lower jaw prosthesis 7 being obtained so similar. These two total dental prostheses 9 and 7 can be fixed in the jaw, temporarily, by adhesive suction, or by using a fixing paste or cream promoting this phenomenon of adhesive suction.
    - Second embodiment of the invention:
    Figures 12 to 16 according to the second embodiment of the invention illustrate the case of a process for manufacturing a partial dental prosthesis, with stellite 22, here of upper jaw. Figures 12 to 16 all show the mold 20 once designed and manufactured by additive manufacturing, before molding (Figures 12 to 14) and after molding (Figures 15 and 16).
    Thus, Figure 12 schematically shows a perspective and exploded view of the parts forming a dental prosthesis mold 20, which are an upper half-shell 21 (gum part), a lower half-shell 23 (tooth part) obtained after modeling, thus than a stellite 22. The lower half-shell 23 is shown in FIG. 13 according to a slightly different perspective view, which makes it possible to better understand its shape. The stellite 22 was designed, as known to those skilled in the art, from the impression-taking step.
    The impression-taking step was carried out by direct scanning in the mouth by intra-oral scanners, or by direct scanning on the impression-taking carried out, for example, with alginate, the plaster model which was issued, or by scanning. It is then possible to model the virtual model (in CAD) of the stellite, the gum part and the teeth part, for example by the Dental wings® software.
    The mold 20 is formed from these three parts 21, 22 and 23.
    The lower half-shell 23 includes the imprints of two elements 23a and 23c constituting the teeth part of the prosthesis to be produced, as well as supports 23b of this teeth part 23b, said supports being placed on a support plane 23d.
    The stellite 22 is formed from a single piece, metallic, which comprises two connecting parts 22b and 22c, corresponding respectively to the elements 23c and 23a of the teeth part, as well as a part 22a intended to be integrated behind the teeth still present and a part 22d intended to rest on the palate; and the upper half-shell 21 which comprises the gum part of the dental prosthesis, as well as the teeth still present 21a, a gum part 21b, and an upper part 21c. If necessary, the artificial teeth which will be integrated into the final prosthesis are machined, in particular to allow better fixation, for example via an orifice allowing a partial passage, of the stellite. The stellite is made of cobalt chromium metal, as it is known in the art.
    The upper half-shell 21, which corresponds to the dental impression of the patient's upper jaw, can be produced in a plaster mold and, in this case, be full.
    The lower half-shell 23 was manufactured by additive manufacturing. The elements 23c and 23a are intended to form the prosthesis, in combination with the corresponding gum part of the upper half-shell 21, while integrating the parts 22b and 22c of the stellite 22.
    Figure 14 schematically shows a perspective view of the dental prosthesis mold of Figures 12 and 13, after fixing the stellite 22 on the lower half-shell 23, at the locations provided for this purpose of the elements 23a, 23c, and the pillars 23b .
    The pillars 23b have locations to receive the stellite 22. They are elements represented here solid elements, mainly to simplify the representation. However, it is preferred in the context of the invention to provide hollow pillars so as to save additive manufacturing material, which is the filling material.
    Figures 15 and 16 schematically represent two perspective views of the mold after assembly, complementary.
    We see the mold 20 assembled, and consisting of the upper half-shell 21, the stellite 22, and the lower half-shell 23. The filling material is supplied by tap holes (not shown) in the mold at the level of the elements 23a and 23c of the lower half-shell, the mold 20 furthermore optionally comprising at least one vent (not shown). This mold advantageously makes it possible to produce a prosthesis according to the invention, as was explained above for the first embodiment.
    - Third embodiment of the invention:
    Figures 17 to 28 according to the third embodiment of the invention illustrate the case of a method of manufacturing a total dental prosthesis, here upper jaw, comprising a support bar 49 intended to fix the prosthesis in the mouth by cooperation with six implants present in the jaw. Figures 17 to 23 represent phases of computer-aided design, which generates models, while Figures 24 to 28 represent actual manufacturing phases proper, comprising the actual production by additive manufacturing of the mold and then the actual production of the dental prosthesis thanks to the mold.
    The support bar 49 is produced in additive manufacturing. It could also have been made by casting in lost wax.
    FIG. 17 schematically represents a perspective view of a first part 37 (gum part) of a dental prosthesis model, produced from the impression-taking step. The upper part 37 comprises a part corresponding to the gum 37a, a part corresponding to the palate 37b, as well as a peripheral part 37c.
    Figure 18 shows schematically a perspective view of a second part (support bar 36) of the dental prosthesis mold model of Figure 17. The support bar 36 has a main semicircular part 36a, and six different pillars holding 36b, intended to be subsequently connected with the six implants of the patient. It is hollow and corresponds to the support bar 49 as it will ultimately be produced.
    Figure 19 shows schematically a perspective view of the first and second parts of the dental prosthesis mold model, reworked by CAD. Thus, the support bar 36 has been reworked into support bar 43, which is a solid model (as opposed to the hollow model of the
    FIG. 18), so as to be able to rework the part 37 (gum part) into part 48. The support bar 43 comprises a main semi-circular part 43a, and six different holding pillars 43b, intended to be brought into contact by the continued with the patient's six implants. The part 48 comprises a gum 48 a, in which six hollowed parts 48b have been created corresponding to the imprints of the six pillars 43b at their bases intended to face the part 48. The part 48 must still be reworked to include a corresponding hollowed part to a main part of the support bar This will allow the subsequent positioning of the support bar relative to the gum part, both in the mold and then in the prosthesis.
    Figure 20 shows schematically a perspective view from above of a third part 38 (teeth part) of the dental prosthesis mold model of Figures 17 to 19. The part 38 is full. It includes a teeth part 38c and a gum part 38b.
    Figure 21 shows schematically a perspective view from below of the third part 38 of Figure 20 reworked. As explained above, the support bar 43 is a solid model (as opposed to the hollow model in FIG. 18), so as to be able to rework the part 38 (teeth part). The part 38 comprises a hollow part 38a corresponding to a main part. of support bar, and six hollowed out parts 38d corresponding to the imprints of the six pillars 43b at their top intended to face the part 43. This will allow the subsequent positioning of the support bar relative to the teeth part, both in the mold then in the prosthesis.
    Figure 22 schematically shows a perspective view from above (Figure 22A) and below (Figure 22B) of an upper half-shell 41 of mold, hollow, corresponding to the gum part 48, produced by additive manufacturing from the model of part of FIG. 19. The external surface of the gum part 48 of FIG. 19 corresponds in all points to the internal surface of the half-shell 41.
    The thickness of the upper half-shell 41 is almost constant and allows a particularly advantageous saving of material.
    There is a gum part 41b, a palace part 41b, a rim part 41c, a part 41 d corresponding to a main part of the support bar, and a part 41e corresponding to the pillars of the support bar.
    Figure 23 schematically shows a perspective view from above (Figure 23A) and below (Figure 23B) of a lower half-shell 42 of mold, hollow, corresponding to the teeth part 47 produced by additive manufacturing from the model of half-shell of FIGS. 20 and 21. The external surface of the teeth part 47 of FIG. 20 corresponds in all points to the internal surface of the half-shell 42.
    The thickness of the lower half-shell 42 is almost constant and allows a particularly advantageous saving of material.
    There is a gum part 42e, a teeth part 42c, a rim part 42d, a substantially planar upper part 42a and a circular peripheral side part 42b. The parts 42a and 42b will advantageously make it possible to stiffen the lower part of the mold once it has been produced by additive manufacturing.
    Figure 24 schematically shows a perspective view from above of the lower half-shell 42 of Figure 23 during the substep of supplying an artificial tooth 45 as well as during the substep of positioning another artificial tooth 44. In this Figure, it can be seen that the artificial tooth 45 has already been positioned, while the artificial tooth 44 is being positioned. The artificial teeth 44 and 45 each have screw passage holes which have been previously machined therein. These holes allow the fixing, before filling, of the pillars of the support bar 49 in the artificial teeth. This is done as many times as necessary to supply all six artificial teeth.
    Figure 25 shows schematically a perspective and exploded view of the assembly of the mold formed by the upper half-shells 41 and lower 42 of Figures 22 and 23 and a support bar (stellite) 49 corresponding to the modeled support bar (36, 43) of Figures 19 and 20. All the artificial teeth have been previously placed in the lower half-shell 42. As explained above, the support bar 49 is fixed by screwing, at the height of each of the pillars in the orifices of the artificial teeth, then the upper half-shell 41 closes the assembly.
    Figure 26 shows schematically a cross-sectional view of the mold after having joined the two half-shells 41 and 42 to each other by assembly. There are the upper half-shell 41, the lower half-shell 42, the support bar 49 and an artificial tooth 44. It can be seen that the support bar 49 is screwed to the artificial tooth 44 at the level of one of its pillars .
    Figure 27 shows schematically a perspective view of the mold after assembly, and before casting of the assembly material. We see the injection symbolized by a syringe partially filled with filling material, as well as a tap hole 41 f for the supply of filling material. A single tap hole 41 f has been symbolized. According to the invention, several tap holes can be present. The hole (s) 41 f may have been machined in the lower half-shell 42 just before assembly of the mold, as symbolically shown here, or else have been provided ( s) in the mold half-shell as soon as it is modeled. According to a preferred variant, the tap hole is completed by at least one vent.
    Figure 28 shows schematically a perspective view of the release of a prosthesis 45 thus obtained after pouring the filling material into the mold (41, 49, 42). Demoulding is achieved by the application of two forces performing two opposite withdrawal movements, illustrated by the arrows Fh and Fb. The prosthesis 45 is made of a solidified resin 46 around artificial teeth and the support bar 49. The pillars of the support bar will allow the prosthesis 45 to be positioned in the patient's jaw by means of implants. These implants will thus be secured to prosthesis 45.
    权利要求:
    Claims (12)
    [1" id="c-fr-0001]
    1. A method of manufacturing a removable dental prosthesis (9) by molding, said method comprising the following successive steps:
    a step of digital modeling of a prosthesis model (10 '; 43, 48, 38), the prosthesis model representing the prosthesis to be produced and comprising a gum part (12'; 48) and a teeth part (13 ' ; 38);
    a step for producing a mold (5; 20; 41; 42) from the prosthesis model, said mold comprising two half-shells, a lower half-shell (3; 21; 42) comprising an imprint of the teeth part of the prosthesis to be produced, and an upper half-shell (4; 23; 41) comprising an imprint of the gum part of the prosthesis to be produced, the two half-shells being configured to be assembled by joining one to the other. the other, the imprints of each half-shell forming by assembly an imprint (9) of the prosthesis to be produced, the step of producing a mold comprising a sub-step of at least partial digital modeling of a model of mold according to the prosthesis model, followed by an additive manufacturing sub-step of at least the lower half-shell according to the mold model, and
    - a step of producing the prosthesis successively comprising at least: a sub-step of supplying at least one artificial tooth (20; 44; 45), a sub-step of positioning the artificial tooth in a housing of the half lower shell (3; 21; 42), a sub-step of assembling the mold and a sub-step of pouring a filling material into the mold.
    [2" id="c-fr-0002]
    2. Manufacturing process according to claim 1, such that the sub-step of additive manufacturing of the mold is carried out by PolyJet® process or by stereolithography (SLA).
    [3" id="c-fr-0003]
    3. The manufacturing method according to one of claims 1 and 2, such that the additive manufacturing sub-step of the mold is carried out by PolyJet® process.
    [4" id="c-fr-0004]
    4. The manufacturing method according to one of claims 1 to 3, such that the additive manufacturing material is chosen from the group formed by acrylic monomers, epoxy monomers, and acrylonitrile butadiene styrene (ABS).
    [5" id="c-fr-0005]
    5. Manufacturing process according to one of claims 1 to 4, such that the additive manufacturing material is an acrylic monomer.
    [6" id="c-fr-0006]
    6. Manufacturing process according to one of claims 1 to 3, such that the additive manufacturing material is chosen from the group formed by polymers polylactic acid (PLA), polyvinyl alcohol (PVA), acrylonitrile budadiene styrene (ABS) and ethylene terephthalate (PET).
    [7" id="c-fr-0007]
    7. The manufacturing method according to one of claims 1 to 6, such that the filling material is an acrylic monomer.
    [8" id="c-fr-0008]
    8. The manufacturing method according to one of claims 1 to 7, such that the step of effective production of the prosthesis is preceded by an impression taking step.
    [9" id="c-fr-0009]
    9. The manufacturing method according to one of claims 1 to 8, such that the stage of actual production of the prosthesis is followed by at least one stage of demolding and / or finishing.
    [10" id="c-fr-0010]
    10. Removable dental prosthesis obtained by a manufacturing process according to one of claims 1 to 9.
    [11" id="c-fr-0011]
    11. Prosthesis according to claim 10, such that the prosthesis is a complete prosthesis or a partial prosthesis.
    [12" id="c-fr-0012]
    12. Prosthesis according to one of claims 10 and 11, such that the prosthesis comprises a support bar (49; 22).
    1/11
    V
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    同族专利:
    公开号 | 公开日
    CA3028891A1|2018-01-04|
    RU2019102033A|2020-07-30|
    EP3478222B1|2021-10-27|
    MX2018016304A|2019-10-07|
    KR20190025950A|2019-03-12|
    MA45555A|2021-03-24|
    BR112018076915A2|2019-04-02|
    FR3053241B1|2021-11-19|
    CN109561948A|2019-04-02|
    AU2017289686A1|2019-01-24|
    JP2019520158A|2019-07-18|
    EP3478222A1|2019-05-08|
    TN2018000439A1|2020-06-15|
    US20190247167A1|2019-08-15|
    WO2018002562A1|2018-01-04|
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    法律状态:
    2017-10-27| PLFP| Fee payment|Year of fee payment: 2 |
    2018-01-05| PLSC| Publication of the preliminary search report|Effective date: 20180105 |
    2018-04-20| PLFP| Fee payment|Year of fee payment: 3 |
    2019-05-29| PLFP| Fee payment|Year of fee payment: 4 |
    2020-04-08| PLFP| Fee payment|Year of fee payment: 5 |
    2020-07-10| TP| Transmission of property|Owner name: BIOTECH DENTAL, FR Effective date: 20200604 |
    2021-05-12| PLFP| Fee payment|Year of fee payment: 6 |
    2021-10-15| TP| Transmission of property|Owner name: CIRCLE CENTRALE DE REFERENCEMENT, FR Effective date: 20210908 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1656228A|FR3053241B1|2016-06-30|2016-06-30|METHOD OF MANUFACTURING A REMOVABLE DENTAL PROSTHESIS BY MOLDING USING A MOLD MADE IN ADDITIVE MANUFACTURING|
    FR1656228|2016-06-30|FR1656228A| FR3053241B1|2016-06-30|2016-06-30|METHOD OF MANUFACTURING A REMOVABLE DENTAL PROSTHESIS BY MOLDING USING A MOLD MADE IN ADDITIVE MANUFACTURING|
    CA3028891A| CA3028891A1|2016-06-30|2017-06-30|Method for manufacture of a removable dental prosthesis by moulding with the aid of a mould formed by additive manufacture|
    BR112018076915-0A| BR112018076915A2|2016-06-30|2017-06-30|process of manufacturing a removable dental prosthesis by molding with the aid of a mold made in additive manufacturing|
    PCT/FR2017/051782| WO2018002562A1|2016-06-30|2017-06-30|Method for manufacture of a removable dental prosthesis by moulding with the aid of a mould formed by additive manufacture|
    KR1020197002958A| KR20190025950A|2016-06-30|2017-06-30|Method for manufacturing removable dental prosthesis by molding using molds molded into laminate manufacture|
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    EP17745418.8A| EP3478222B1|2016-06-30|2017-06-30|Method for manufacture of a removable partial dental prosthesis by moulding with the aid of a mould formed by additive manufacture|
    RU2019102033A| RU2019102033A|2016-06-30|2017-06-30|METHOD FOR MANUFACTURING REMOVABLE DENTAL PROSTHESIS THROUGH CASTING USING A FORM MADE WITH THE APPLICATION OF ADDITIVE MANUFACTURING|
    AU2017289686A| AU2017289686A1|2016-06-30|2017-06-30|Method for manufacture of a removable dental prosthesis by moulding with the aid of a mould formed by additive manufacture|
    MX2018016304A| MX2018016304A|2016-06-30|2017-06-30|Method for manufacture of a removable dental prosthesis by moulding with the aid of a mould formed by additive manufacture.|
    TNP/2018/000439A| TN2018000439A1|2016-06-30|2017-06-30|METHOD OF MANUFACTURING A REMOVABLE DENTAL PROSTHESIS BY MOLDING USING A MOLD MADE IN ADDITIVE MANUFACTURING|
    JP2018569075A| JP2019520158A|2016-06-30|2017-06-30|Method of manufacturing removable dental prosthesis by molding using a mold formed by additive manufacturing|
    MA045555A| MA45555A|2016-06-30|2017-06-30|PROCESS FOR MANUFACTURING A REMOVABLE PARTIAL DENTAL PROSTHESIS BY MOLDING USING A MOLD MADE IN ADDITIVE MANUFACTURING|
    US16/314,072| US20190247167A1|2016-06-30|2017-06-30|Method for manufacture of a removable dental prosthesis by moulding with the aid of a mould formed by additive manufacture|
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