• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The disclosure relates to a fastening system for fastening a dental prosthesis (1) to a dental implant (2) having a ball shaped portion (3), wherein the fastening system comprisesan external sleeve (10) , a manoeuvring member (20) and a gripping member (30), wherein a seat portion (30b) of the gripping member (30) is provided with a circumferentially extending wall (32) extending around the seat (31),wherein the wall is provided with at least two slits (33a, 33b), each slit having a transverse extension (T) through the wall (32) from an inner surface (31') of the seat (31) to an outer surface (32’) of the seat portion (30b) and each slit having a longitudinal extension (L) with a major extension along the bore axis (A) from a mouth portion (m) of the seat (31) towards the body portion (30a),wherein the slits (33a, 33b) divide the wall (32), as seen along the circumference of the wall (32), in at least two wall portions (32a, 32b), which wall portions are interconnected via the body portion (30a), thereby allowing the wall portions (32a, 32b) to resiliently flex towards each other when subjected to an inwardly directed force.
    公开号:SE1651086A1
    申请号:SE1651086
    申请日:2016-07-26
    公开日:2018-01-27
    发明作者:Lauridsen Christian
    申请人:Addbutment Dental Ab；
    IPC主号:
    专利说明:

    FASTENING SYSTEM FOR FASTENING A DENTAL PROSTHESIS TO ADENTAL IMPLANT Field of inVentionThe inVentions relates to a fastening system for fastening a dental prosthesis toa dental implant having a ball shaped portion.
    Technical BackgroundImplant systems of today attempt to restore the patient to norrnal filnction, comfort, aesthetic, speech and health regardless of the current oral condition. Theseimplant systems are based on the implantation of dental implants, such as dentalimplants made of biocompatible titanium or any other dental material, throughinsertion into the patient's jawbone. There are many methods to attach a dentalsuperstructure or prosthesis to an implant, where one example is the use of dentalcement. Other examples are methods that are based on the use of a screw means,where these screw members can attach the superstructure to the implant, eitherdirectly or via spacers.
    When a patient has been without tooth/teeth for a period of time, the jawbonestarts to degenerate, since the jawbone is not under strain from masticatory forces.This results in less bone material for the proper anchoring of a dental implant. To findenough bone for optimal implantation, the dental implant sometimes has to be angledso that the longitudinal axis of the dental implant projects out of the mouth.
    Fixing a superstructure with dental cement is complicated due to Variousfactors such as Varied drying time of the cement, difficulties in fixating thesuperstructure while the dental cement is drying, and problems related to adjusting adental superstructure once the dental cement has dried. If a screw means is used, itnecessitates that the mouth of the screw channel is placed on a Visible surface of thedental superstructure or prosthesis.
    WO20l0/036l97 A1 discloses a superstructure for a dental implant. Thesuperstructure comprises a fastening portion with a joint socket in form of aspherically shaped caVity with a fastening surface, and a main portion. Thissuperstructure is intended to be j oined to an osseointegrated dental implant via thefastening portion. The main portion comprises a screw hole partly forrning anopening in the fastening surface, such that there is a perpendicularly distance between the center of the spherical caVity and the central axis of the screw hole. A screw in the screw hole may be used to clamp a spherical member of the dental implant in thecavity.
    WO20l5/ 152815 discloses a fastening system for a dental implant comprisinga ball shaped portion, wherein the fastening system comprises a body having a seatforming a cavity. The fastening system is characterized in that the body comprises atleast two parts together forrning the seat. The parts are arranged such that the seat canengage around the ball shaped portion of the dental implant and in that the seat ismovable between a first position in which the parts are allowed to move relative eachother, and a second position in which the parts are prevented from moving relativeeach other, thereby lockingly engaging the ball shaped portion of the dental implant.
    When designing the above referenced kinds of dental implants and dentalprosthesis there are a number of design criteria to consider. It should be able toprovide suff1ciently strong fixation of the prosthesis. It should be easy for the dentistto correctly position the prosthesis in the patient°s mouth. It should be flexible in thesense that it is useful for many different patients with varying appearance andconditions. The above referenced fastening systems address these design criteria.Other fastenings systems addressing these design criteria will be discussed below.Another design criterion is that it should be easy to manufacture.
    WO20l2/ 156459 discloses a fastening system in which the number of parts isreduced and a standard screw may used. The clamping element is formed of two partsbeing pivotably suspended inside a superstructure. The two parts are pushed apart bya standard screw at a distance from the pivot points and at another side of the pivotpoints the two parts will clamp the ball shaped member of the dental implant.
    US5 842864 discloses a similar system. The two clamping parts are pivotablysuspended inside a dental prosthesis. The two clamping parts are urged from eachother by a cam member thereby causing the other ends of the clamping parts to clamparound a ball shaped member of the dental implant.
    KRl0l065924 also discloses a system where a screw is inserted from a sideand is used to draw two portions of the clamping member towards each other.
    EP2647347 discloses a complicated design where the dental implant isprovided with a plurality of curved ribs and the superstructure or the dental prosthesisis provided with a dual system with a ball and a seat outside the ball. The curved ribsof the dental implant are clamped between the ball and the seat.
    US 5,564,922 discloses a universal joint for dental abutment implant. Thedental implant is provided with a seat adapted to receive a ball of a dental prosthesis.
    There is disclosed a number of different manners of fixing the ball to the seat by introducing a screw or a wedge from the side directly at the interface between the seatand the ball.
    It may be noted that there is still room for improvements when it comes tofinding a suitable balance between e.g. making the fastening system easy to use, easyto manufacture and assemble, and making it flexible allowing it to be used for many different patients.
    Summary of inventionIt is an object of the invention to provide an improved fastenings system addressing at least some of the above mentioned issues conceming making thefastening system easy to use, easy to manufacture and assemble, and making itflexible allowing it to be used for many different patients.
    This object has been achieved by a fastening system for fastening a dentalprosthesis to a dental implant having a ball shaped portion, wherein the fasteningsystem comprises an extemal sleeve adapted to form part of or support a dental prosthesis, theextemal sleeve being provided with a bore extending along a bore axis through theextemal sleeve, a manoeuvring member being received in a first portion of the bore and beingrotatable in the bore about the bore axis, a gripping member being received in a second portion of the bore, thegripping member being provided with a body portion and a seat portion, the seatportion having a seat adapted to grip around said ball shaped portion of said dentalimplant, wherein the bore is provided with an radially inwardly extending shoulderportion adapted to interact with a radially outwardly extending shoulder portion of themanoeuvring member thereby preventing the manoeuvring member from moving inthe bore from the first portion to the second portion, wherein the manoeuvring member and the gripping member are provided withobliquely oriented mutually interacting surfaces such that rotation of the manoeuvringmember causes the gripping member and the manoeuvring member to move relativeto each other along the bore axis, wherein the seat portion of the gripping member is provided with acircumferentially extending wall extending around the seat, wherein the wall is provided with at least two slits, each slit having atransverse extension through the wall from an inner surface of the seat to an outer surface of the seat portion and each slit having a longitudinal extension with a major extension along the bore axis from a mouth portion of the seat towards the bodyportion, wherein the slits divide the wall, as seen along the circumference of the wall,in at least two wall portions, which wall portions are interconnected via the bodyportion, thereby allowing the wall portions to resiliently flex towards each other whensubjected to an inwardly directed force, wherein the wall portions have outwardly facing abutment surfaces taperingtowards the first portion of the bore, wherein the second portion of the bore has an inwardly facing abutmentsurface being adapted to interact with the outwardly facing abutment surfaces of thewall portions, whereby rotation of the manoeuvring member is adapted to pull thegripping member towards the first portion of the bore such that said abutmentsurfaces interacts and forces the wall portions resiliently towards each other, thefastening system thereby being adapted to clamp onto said ball of said dental implant.
    By designing the fastening system in this manner a number of advantages isachieved. The fastening system comprises a limited number of components. Thecomponents may be assembled into a single assembly at the manufacturing site andthe dentist does not need to assemble it on site. The manoeuvring member isaccessible along the bore axis which typically will provide easy access and visibilityfor the dentist using a screw driver to rotate the manoeuvring member. Thecombination of a wedge like action by the tapering abutment surfaces and theobliquely oriented mutually interacting surfaces makes it possible to provide a strongclamping force with relatively limited torque applied to the manoeuvring member.
    By providing the wall with at least two slits in the manner disclosed abovesuch that the wall portions resiliently flex towards each other when subj ected to aninwardly directed force it is easy to press the seat onto the ball and then to change theangle between the dental implant and the extemal sleeve. It is easy to f1ne-tune theresistance against this angular movement by simply tighten the clamping forceslightly by slightly rotating the manoeuvring member. If the resistance is too strong, itmay equally easily be loosened due to the resilient nature of the wall portions. If themanoeuvring element is loosened the walls will move away from each other.
    Preferred embodiments appear in the dependent claims and in the description.
    Each slit may at its innerrnost end be provided with a locally widened portionbeing widened in a widening direction being transverse to the transverse andlongitudinal extension of the slits. This increases the resilient flexibility of the wall portions, which allows for a compact design.
    Each slit may extend in its longitudinal extension towards the body portionpast a bottom surface of the seat. This will allow the wall to resiliently flex with aminimum of distortion of the shape of the seat, thereby allowing a strong clampingforce to be achieved and allowing fine-tuning of the resistance against angularmovement also at different angles during fitting of the dental prosthesis.
    The widened portion of each slit may be positioned at the bottom surface ofthe seat such that it extends partly within a geometrical, preferably spherical, volumeof the seat and partly outside the geometrical, preferably spherical, volume of theseat. This allows for a compact design with efficient resilient flexing of the wallportions. It may be noted that the widened portion forms a groove extending at theinner most surface of the seat from one of the slits to the other one of the slits. Thegroove will thereby extend outside the geometrical spherical volume of the seat.
    The inwardly facing abutment portion of the second portion of the bore maytaper inwardly towards the first portion. This allows for a secure clamping betweenthe gripping member and the extemal sleeve.
    The abutment surfaces of the wall portions may taper with a first inclinationand the abutment portion of the second portion of the bore may taper with a secondinclination, wherein the first inclination may be greater than the second inclination.This will allow for a secure clamping between the gripping member and the extemalsleeve and still reducing the frictional force counteracting the withdrawal of thegripping member into the bore of the extemal sleeve. It will also reduce the need fortight tolerances.
    The walls may have, as seen in a radial direction, outside of the maximumdiameter of the seat, a material thickness being from 5% to 25% compared to themaximum diameter of the seat. This will provide a suitable resilience during fittingand still allows the walls to forcefi1lly clamp the ball of the dental implant once thefitting is finalised.
    Each slit may have a width across the transverse and longitudinal extensionbeing from l% to 5% compared to the maximum diameter of the seat. This willprovide a suitable resilience during fitting and still allows the walls to forcefullyclamp the ball of the dental implant once the fitting is finalised.
    The widened portion may have a maximum width being from 5% to 25%compared to the maximum diameter of the seat. This will provide a suitable resilienceduring fitting and still allows the walls to forcefully clamp the ball of the dentalimplant once the fitting is finalised.
    The widened portion may have a circular cross-section as seen in the transverse extension of the slit. This will provide a suitable resilience during fitting and still allows the walls to forcefully clamp the ball of the dental implant once thef1tting is f1nalised. It also reduces the risk of any cracks propagating from the ends ofthe slits.
    The wall extending around the seat and at least a portion of the body portionbeing closest to the wall may be uniforrnly formed of a single piece of metallicmaterial, wherein the slits may be formed by removing material from the walls. Thisis a simple and robust manner of providing the desired resilience.
    The wall extending around the seat and at least a portion of the body portionbeing closest to the wall may be uniforrnly formed of a single piece of metallicmaterial having a modulus of elasticity between l00-200GPa. By choosing materialswithin this range of modulus of elasticity (Young°s modulus) the desired resiliencymay be provided to facilitate fitting and a strong clamping force may be achievedonce f1tting is f1nalised. The design of the fastening system allows to provide thedesired resiliency when using titanium based alloys having modulus of elasticity ofabout l00-l30GPa. The design of the fastening system allows e. g. the use of titaniumgrade 5 having a modulus of elasticity of about ll4GPa.
    The seat may have a mouth having a diameter from 90% to 97% compared tothe maximum diameter of the seat. This allows for relatively easy initial installationof the seat onto the ball and still it allows for significant angular adjustment duringfitting. It also allows for strong clamping forces even at significant angularadjustments.
    In short the fastening system may be said to be a fastening system forfastening a dental prosthesis to a dental implant having a ball shaped portion, whereinthe fastening system comprises an extemal sleeve, a manoeuvring member and a gripping member, wherein the seat portion of the gripping member is provided with acircumferentially extending wall extending around the seat, wherein the wall is provided with at least two slits, each slit having atransverse extension through the wall from an inner surface of the seat to an outersurface of the seat portion and each slit having a longitudinal extension with a majorextension along the bore axis from a mouth portion of the seat towards the bodyportion, wherein the slits divide the wall, as seen along the circumference of the wall,in at least two wall portions, which wall portions are interconnected via the bodyportion, thereby allowing the wall portions to resiliently flex towards each other when subjected to an inwardly directed force.
    Brief description of the drawings The fastening system will by way of example be described in more detail withreference to the appended schematic drawings, which shows a presently preferredembodiment of the fastening system.
    Figure l is an exploded view of the fastening system.
    Figures 2a-d disclose an extemal sleeve.
    Figures 3a-c disclose a manoeuvring member.
    Figures 4a-d disclose a gripping member.
    Detailed description of preferred embodiments As indicated in figure l, the fastening system is adapted to fasten a dentalprosthesis l (indicated by the dashed line) to a dental implant 2 having a ball shapedportion 3. The fastening system comprises an extemal sleeve l0, a manoeuvringmember 20 and a gripping member 30. The dental implant 2 may be made ofbiocompatible titanium or any other dental material. The dental implant 2 is adaptedto be inserted into the patient's jawbone 4. The dental implant 2 may be attached tothe j awbone 4 e.g. by being provided with threads and thereby be screwed into thej awbone 4. The dental implant 2 may be a single piece member or may be formed ofmore than one member. It may e. g. be formed of a first extemally threaded member,which is first screwed in the jawbone 4, and a second ball carrying member, which isattached to the first member thereafter. The second member may e. g. be screwed intoa threaded intemal bore of the first member as indicated by the dashed line inside thedental implant 2.
    The extemal sleeve l0 is adapted to form part of or support a dental prosthesisl and is disclosed in more details in figures 2a-d. The extemal sleeve 10 is providedwith a bore ll extending along a bore axis A through the extemal sleeve l0. The borell may be said to have a first portion l la and a second portion l lb. The manoeuvringmember 20 is received in the first portion l la and the gripping member 30 is receivedin the second portion l lb. As will be apparent from the description below, the firstportion l la will extend from one end of the bore ll towards the second portion l lband the second portion l lb will extend from the other end of the bore ll towards thefirst portion l la. Since the gripping member 30 and the manoeuvring member 20 willco-extend along a central portion of the bore ll it may be said that there is a centraloverlap between the first and the second portions l la, l lb of the bore ll.
    The first portion l la of the bore ll is essentially cylindrical and has adiameter D11 A. The manoeuvring member 20 is also essentially cylindrical and has an outer envelope surface 20a with an outer diameter D20. The outer diameter D20 of the manoeuvring member 20 is slightly smaller than the diameter D1 1A of the bore 11.Thereby the manoeuvring member 11 may be received in the first portion 1 la of thebore 11 and may be rotatable in the bore 11 about the bore axis A.
    The bore 11 is provided with an radially inwardly extending shoulder portion11c adapted to interact with a radially outwardly extending shoulder portion 20c ofthe manoeuvring member 20 thereby preventing the manoeuvring member 20 frommoving in the bore 11 from the first portion 1 la to the second portion 1 lb.
    In order to minimise the risk that the manoeuvring member 20 is accidentallyremoved from the bore 11, the manoeuvring member 20 may be provided with asmall protrusion 20b and the second portion 11b of the bore 11b may have an innerdiameter D11B allowing the protrusion 20b to sweep around the bore axis A as themanoeuvring member 20 is rotated about the bore axis A. The maximum radius RQOCprovided by the protrusion 20c is too large for the protrusion 20c to pass the firstportion 11a. As is shown in figure 3a, the protrusion 20b is located close to the innerend of the manoeuvring member 20 and has an extension Hgob along the bore axis Abeing significantly smaller than the height H20 of the manoeuvring member 20. Toallow the manoeuvring member 20 to be inserted into the bore 11, the inner envelopesurface of the first portion 1 la is provided with a groove 11d allowing the protrusion20b to pass the first portion 1 la and to enter into the second portion 1 lb. Since therotational position of the protrusion 20b is not visible to the user once it has beeninserted into the bore 11 it is beneficial to indicate the position of the protrusion 20be.g. by providing a depression 20c acting as a marker in line with the protrusion 20b.
    The manoeuvring member 20 is also provided with a first manoeuvringportion 20d adapted to interact with a tool by which the user may manoeuvre themanoeuvring member 20. In the preferred embodiment, the manoeuvring portion 20dis a hexagonally shaped cavity adapted to interact with a so-called hex key.
    The manoeuvring member 20 is also provided with a second manoeuvringportion 20e adapted to interact with the gripping member 30. In the preferredembodiment, the second manoeuvring portion 20e comprises an intemally threadedcylindrical cavity forming an M2 nut.
    The gripping member 30 is as shown in the figures adapted to be received inthe second portion 11b of the bore 11. The gripping member 30 is as shown in figures4a-d provided with a body portion 30a and a seat portion 30b.The body portion 30acomprises an extemally threaded cylindrical portion 30a” having a height H30A» andforming an M2 bolt adapted to be threaded into the second manoeuvring portion 20e of the manoeuvring member 20.
    As shown in figures 2a-d, the second portion l lb of the bore ll adapted toreceive the gripping member 30 is provided with an outer frusto-conical portion l le,followed by a reduced diameter neck portion l lf in turn followed by a wider innerportion l lg.
    The gripping member 30 is provided with a small protrusion 30c. Theprotrusion 30c is located between the threaded portion 30a° and the seat portion 30b.The protrusion 30c has a height H30C being significantly smaller than the height H30Aof the body portion 30a and a limited circumferential extension (shown in figure 4d) The wider inner portion ll g has an intemal diameter Dl lG allowing theprotrusion 30c to sweep around. The neck portion l lf has an intemal diameter D1 lppreventing the protrusion 30c from passing the neck portion l lf unless the protrusion30c coincides with a groove llh extending along the bore axis A similarly to the waythe groove lld extends the outer portion of the first portion l la of the bore ll.
    As shown in figures 4a-d, the seat portion 30b of the gripping member 30 hasa seat 3l adapted to grip around the ball shaped portion 3 of the dental implant 2. Theseat portion 30b is provided with a circumferentially extending wall 32 extendingaround the seat 3 l.
    The wall 32 is provided with at least two slits 33a, 33b. Each slit 33a, 33b hasa transverse extension T through the wall 32 from an inner surface 3 l ° of the seat 3lto an outer surface 32” of the seat portion 30b and each slit 33a, 33b having alongitudinal extension L with a major extension along the bore axis A from a mouthportion 3 la of the seat 3l towards the body portion 30a.
    The two slits 33a-b divide the wall 32, as seen along the circumference of thewall 32, in two wall portions 32a-b. The wall portions 32a-b are interconnected viathe body portion 30a, thereby allowing the allowing the wall portions 32a-b toresiliently flex towards each other when subj ected to an inwardly directed force.
    The wall portions 32a-b have outwardly facing abutment surfaces 32a°, 32b°tapering towards the first portion l la of the bore ll.
    The second portion l lb of the bore ll has an inwardly facing abutmentsurface l lf being adapted to interact with the outwardly facing abutment surfaces32a°, 32b” of the wall portions 32a-b, whereby rotation of the manoeuvring member20 is adapted to pull the gripping member 30 towards the first portion l la of the borell such that said abutment surfaces 32a°, 32b°, l lf interacts and forces the wallportions 32a-b resiliently towards each other, the fastening system thereby beingadapted to clamp onto the ball 3 of the dental implant 2. The inwardly facingabutment portion l lf of the second portion l lb of the bore ll tapers inwardlytowards the first portion lla. The abutment surfaces 32a°, 32b° of the wall portions 32a-b taper with a first inclination ot and the abutment portion 1 lf of the secondportion 1 lb of the bore 11 tapers with a second inclination ß, wherein the firstinclination ot is greater than the second inclination ß. In practice the gripping member30 may have a conical portion with an angle ot being about 20° whereas thecorresponding angle ß of the portion 11f of the bore 11 is about 19,5°.
    In the preferred embodiment, the abutments surfaces 32a°, 32b” are providedwith a rim 35 extending around the wall 32. The rim 35 is located at the distal end ofthe wall 32 relative to the body portion 30a of the gripping member 30. The rim 35extends radially outwardly relative to the remaining portions of the abutment surfaces32a°, 32b”. The diameter D3013 of the tapering portion 30b of the gripping member 30and the diameter D11F of the tapering portion 1 lf of the bore 11 are chosen such thatthe rim 35 will enter into contact with the tapering portion 1 lf of the bore 11. Sincethe tapering portion 30b of the gripping member 30 tapers with a greater inclinationthan the tapering portion 1 lf of the bore 11, the rim 35 will contact the inside of thetapering portion 1 lf of the bore 11 as long as the tapering portion 1 lf has anextension along the bore axis A sufficient to receive the tapering portion 30b until therim 35 enters into contact with the tapering portion 1 lf of the bore 11.
    As is shown in figures 4a-d, each slit 33a-b is at its innerrnost end providedwith a locally widened portion 36a. 36b being widened in a widening direction T;being transverse to the transverse T and longitudinal L extension of the slits 33a, 33b.
    Each slit 33a, 33b extend in its longitudinal extension L towards the bodyportion 30a past a bottom surface 31 ” of the seat 31.
    The widened portion 36a-b of each slit 33a, 33b is, as seen along the boreaxis, positioned at the bottom surface 31 ° ° of the seat 31 such that the widenedportion 36 extends partly within a geometrical, preferably spherical, volume of theseat 31 and partly outside the geometrical, preferably spherical, volume of the seat 31.In figure 4b it is shown that the widened portion 36 has a circular cross-section asseen in the transverse extension T of the slit 33a, 33b. In the preferred embodimentthe widened portions 36a, 36b basically forms a cylindrical bore 36 extending alongthe transverse direction T all the way through the gripping member 31.
    The walls 32a, 32b have, as seen in a radial direction, outside of the maximumdiameter D31 of the seat 31, a material thickness t being from 5% to 25% compared tothe maximum diameter D31 of the seat 31. The seat 31 has a spherical shape with adiameter D31. The bore 36 has its centre point at a latitude (height along the bore axisA) being half the diameter D31 from the centre point C31 of the seat 31. The maximumdiameter D31 along the radial direction R crosses the centre point C31. At other latitudes, the diameter measured parallel to the radial direction R will be smaller. 11 Each slit 33a, 33b have a width W across the transverse T and longitudinal Lextension being from 1% to 5% compared to the maximum diameter D31 of the seat31. In the preferred embodiment, the slits 33a, 33b have a width W being about0,05mm. In the preferred embodiment, the diameter D31 of the spherical seat 31 isabout 2,25mm.
    The widened portion 36a, 36b have a maximum width W36 being from 5% to25% compared to the maximum diameter D31 of the seat 31. In the preferredembodiment, the portion 36 have a diameter of about 0,3mm.
    The wall 32 extending around the seat 31 and at least a portion of the bodyportion 30a being closest to the wall 32 is uniforrnly formed of a single piece ofmetallic material. The slits 33a, 33b are e. g. formed by removing material from thewalls 32. In the preferred embodiment the complete gripping member 30 is formed ofa single piece of metallic material.
    The wall 32 extending around the seat 31 and at least a portion of the bodyportion 30a being closest to the wall 31 is uniforrnly formed of a single piece ofmetallic material having a modulus of elasticity between 100-200GPa. As mentionedabove, in the preferred embodiment the complete gripping member 30 is formed of asingle piece of metallic material, preferably titanium based alloy, most preferablytitanium grade 5. Suitable titanium based alloys have typically a modulus of elasticityof about 100-130GPa. In the preferred embodiment, the fastening system is formed oftitanium grade 5 having a modulus of elasticity of about 1l4GPa.
    The seat 31 has a mouth having a diameter Dm from 90% to 97% compared tothe maximum diameter D31 of the seat 31.
    As is shown e. g. in figure 4b, the slots 33a, 33b are provided with an entranceportion 33a°, 33b” being closest to the mouth of the seat 3 land extending at anangle y, preferably of about 45°, relative to the bore axis A. As shown in figure 4b,the entrance portion 33a°, 33b” connects to the main portion of the slit 33a, 33bextending along the bore axis A at an altitude between the mouth of the seat 31 andthe centre point C31 of the seat 31 at a distance d331,» from the centre point C31, thisdistance d331,fl being about or preferably slightly larger than half the distance from thecentre point C31 to the mouth of the seat 31. The entrance portion 33b°, 33a°b ofrespective slit has preferably the same width w as the other portions of respective slit33a, 33b.
    It is contemplated that there are numerous modifications of the embodimentsdescribed herein, which are still within the scope of the invention as defined by the appended claims. 12 The manoeuvring member and the gripping member may e. g. be instead ofbeing provided With threads by provided With other kinds of obliquely orientedmutually interacting surfaces securing that rotation of the manoeuvring membercauses the gripping member and the manoeuvring member to move relatiVe to eachother along the bore axis. Such obliquely oriented mutually interacting surfaces maye.g. be a pin in one of the members following an obliquely oriented circumferentiallyextending groove or slot in the other member (similarly to a so-called bayonetmount).
    权利要求:
    Claims (13)
    [1] 1. Fastening system for fastening a dental prosthesis (1) to a dental implant (2)having a ball shaped portion (3), wherein the fastening system comprises an external sleeve (10) adapted to form part of or support a dental prosthesis(1), the external sleeve (10) being provided with a bore (11) extending along a boreaxis (A) through the external sleeve (10), a manoeuvring member (20) being received in a first portion (1 la) of the bore(11) and being rotatable in the bore (1 1) about the bore axis (A), a gripping member (30) being received in a second portion (11b) of the bore(11), the gripping member (30) being provided with a body portion (30a) and a seatportion (30b), the seat portion (30b) having a seat (31) adapted to grip around saidball shaped portion (3) of said dental implant (2), wherein the bore (1 1) is provided with an radially inwardly extendingshoulder portion (1 lc) adapted to interact with a radially outwardly extendingshoulder portion (20c) of the manoeuvring member (20) thereby preventing themanoeuvring member (20) from moving in the bore (11) from the first portion (1 la)to the second portion (11b), wherein the manoeuvring member (20) and the gripping member (3 0) areprovided with obliquely oriented mutually interacting surfaces (20e, 30a°) such thatrotation of the manoeuvring member causes the gripping member (3 0) and themanoeuvring member (20) to move relative to each other along the bore axis (A), wherein the seat portion (3 0b) of the gripping member (3 0) is provided with acircumferentially extending wall (32) extending around the seat (31), wherein the wall (32) is provided with at least two slits (33a, 33b), each slit(33a, 33b) having a transverse extension (T) through the wall (32) from an innersurface (31 °) of the seat (31) to an outer surface (32°) of the seat portion (31) andeach slit (33a, 33b) having a longitudinal extension (L) with a major extension alongthe bore axis (A) from a mouth portion (m31) of the seat (31) towards the body portion(3 0a), wherein the slits (33a, 33b) divide the wall (32), as seen along thecircumference of the wall (32), in at least two wall portions (32a, 32b), which wallportions (32a, 32b) are interconnected via the body portion (3 0a), thereby allowingthe wall portions (32a, 32b) to resiliently flex towards each other when subj ected toan inwardly directed force, wherein the wall portions (32) have outwardly facing abutment surfaces (32a°,32b°) tapering towards the first portion (1 la) of the bore (1 1), 14 wherein the second portion (11b) of the bore (11) has an inward1y facingabutment surface (11e) being adapted to interact with the outward1y facing abutmentsurfaces (32a°, 32b) of the wa11 portions (32a, 32b), whereby rotation of themanoeuvring member (20) is adapted to pu11 the gripping member (3 0) towards thefirst portion (11a) of the bore (11) such that said abutment surfaces (32a°, 32b°)interacts and forces the wa11portions (32a, 32b) resi1ient1y towards each other, thefastening system thereby being adapted to c1amp onto said ba11 (3) of said denta1imp1ant (2).
    [2] 2. Fastening system according to c1aim 1, wherein each s1it (33a, 33b) at itsinnerrnost end is provided with a 1oca11y widened portion (3 6a, 36b) being widened ina widening direction (Tg) being transverse to the transverse (T) and 1ongitudina1 (L)extension of the s1its (33a, 33b).
    [3] 3. Fastening system according to c1aim 1 or 2, wherein each s1it (33a, 33b)extends in its 1ongitudina1 extension (L) towards the body portion (3 0a) past a bottomsurface (31”) ofthe seat (31).
    [4] 4. Fastening system according to c1aim 3, wherein the widened portion (3 6a,36b) of each s1it (33a, 33b) is positioned at the bottom surface (31 ° ”) of the seat (31)such that it extends part1y within a geometrica1Vo1ume of the seat (31) and part1y outside the geometrica1vo1ume of the seat (31).
    [5] 5. Fastening system according to any one of c1aims 1-4, wherein the inward1yfacing abutment portion (11e) of the second portion (11b) of the bore (11) tapersinward1y towards the first portion (1 1a).
    [6] 6. Fastening system according to c1aim 5, wherein the abutment surfaces(32a°, 32b”) of the wa11 portions (32a, 32b) taper with a first inc1ination (ot) and theabutment portion (11f) of the second portion (11b) of the bore (11) tapers with asecond inc1ination (ß), wherein the first inc1ination (ot) is greater than the second inc1ination (ß).
    [7] 7. Fastening system according to any one of c1aims 1-6, wherein the wa11sportions (32a, 32b) have, as seen in a radia1 direction (R), outside of the maximumdiameter (D31) of the seat (31), a material thickness (t) being from 5% to 25% compared to the maximum diameter (D31) of the seat (31).
    [8] 8. Fastening system according to any one of claims 1-7, wherein each slit(33a, 33b) has a width (W) across the transverse (T) and longitudinal (L) extension being from 1% to 5% compared to the maximum diameter (D31) of the seat (31).
    [9] 9. Fastening system according to any one of claims 2-8, wherein the widenedportion (36a, 36b) has a maximum width (w36) being from 5% to 25% compared to the maximum diameter (D31) of the seat (31).
    [10] 10. Fastening system according to any one of claims 2-9, wherein the widenedportion (36a, 36b) has a circular cross-section as seen in the transverse extension (T)ofthe slit (31).
    [11] 11.Fastening system according to any one of claims 1-10, wherein the wall(32) extending around the seat (31) and at least a portion of the body portion (30a)being closest to the wall (32) is uniforrnly formed of a single piece of metallicmaterial, wherein the slits (33a, 33b) are formed by remoVing material from the wall(32).
    [12] 12. Fastening system according to any one of claims 1-11, wherein thewall(32) extending around the seat (31) and at least a portion of the body portion(30a) being closest to the wall (32) is uniforrnly formed of a single piece of metallic material having a modulus of elasticity between 100-200GPa.
    [13] 13. Fastening system according to any one of claims 1-12, wherein the seat(31) has a mouth (m31) having a diameter (Dm) from 90% to 97% compared to the maximum diameter (D31) of the seat (31).
    类似技术:
    公开号 | 公开日 | 专利标题
    US4793808A|1988-12-27|Enossal implant
    US20190117346A1|2019-04-25|Method of attaching a dental component to a dental implant
    AU2013362172B2|2018-03-08|Abutment and method of attaching an abutment to a dental implant
    US5069622A|1991-12-03|Spacer
    US5417570A|1995-05-23|Dental anchor assembly
    JP5480628B2|2014-04-23|Dental attachment assembly and method
    JP6346903B2|2018-06-20|Dental device fixation unit elastically fixed in the implant and / or dental device fixation unit fixed in the implant allowing optional angular position adjustment
    JP5285691B2|2013-09-11|Implantable orthopedic device comprising a support structure having at least one hole associated with a nut and serving as a passage for a fastening screw
    EP0323421B2|2000-01-26|Spacer for dental implants
    EP2684539B1|2017-04-05|Superstructure
    US20060216672A1|2006-09-28|Jaw implant
    WO2005060505A2|2005-07-07|Threaded dental or medical implant
    US20100316970A1|2010-12-16|Implant root for tooth implanting
    US10507085B2|2019-12-17|Structure enabling continuous angular adjustment for fixing a single dental device into an implant
    SE1651086A1|2018-01-27|Fastening system for fastening a dental prosthesis to a dental implant
    JP5978537B2|2016-08-24|Dental superstructure mounting system and method for mounting a dental superstructure on a dental implant
    US10182888B2|2019-01-22|Fastening system for dental implants
    KR102208556B1|2021-01-28|Dental implant assembly and dental abutment
    JP2018531713A|2018-11-01|Set of dental implant and prosthetic component with transepithelial sleeve with anti-rotation upper connection
    同族专利:
    公开号 | 公开日
    WO2018021955A1|2018-02-01|
    EP3490492A4|2020-04-15|
    EP3490492B1|2021-11-17|
    EP3490492A1|2019-06-05|
    SE540145C2|2018-04-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE9419508U1|1994-12-06|1996-04-04|Unger Heinz Dieter Dr Med Dent|Prosthetic superstructure|
    ES2286878T3|1999-01-22|2007-12-01|Cendres Et Metaux S.A.|ANCHORAGE FOR DENTAL PROTESIS.|
    BR112013029517A2|2011-05-16|2017-01-24|Heraeus Dental Ab|dental superstructure fixation system and methods for attaching a dental superstructure to a dental implant|
    ES2386589B2|2012-04-02|2013-03-25|Terrats Mecanizados, S.L.|PROTESTIC ADDITION|
    CN106456288B|2014-04-04|2019-09-27|斯姆普莱牙科股份公司|Fastening system for dental implant|
    DE202014005641U1|2014-07-11|2015-10-13|Frank Löring Dentaltechnik GmbH|Implant system and implant|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1651086A|SE540145C2|2016-07-26|2016-07-26|Fastening system for fastening a dental prosthesis to a dental implant|SE1651086A| SE540145C2|2016-07-26|2016-07-26|Fastening system for fastening a dental prosthesis to a dental implant|
    PCT/SE2017/050781| WO2018021955A1|2016-07-26|2017-07-14|Fastening system for fastening a dental prosthesis to a dental implant|
    EP17834866.0A| EP3490492B1|2016-07-26|2017-07-14|Fastening system for fastening a dental prosthesis to a dental implant|
    [返回顶部]