Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
  • A61C8/0001—Impression means for implants, e.g. impression coping

Definitions

• the present invention relates to devices for transferring, to a laboratory model, the shape and relative disposition of the surfaces of a dentition in the mouth of a patient.
• the invention relates more specifically to such a device specially designed to transfer to the laboratory model the relative position of a prosthetic support for fixing a prosthesis on an implant already in position in the mouth of a patient.
• Dental implants are widely used to replace damaged or lost natural teeth. For this, it implements, in the jaw of a patient, an implant intended to replace the natural tooth root.
• the implant is associated with a receiving structure, intended to protrude outside the gum to receive and fix a dental prosthesis which, it reproduces as closely as possible the shape and appearance of the natural tooth to replace.
• the dental prosthesis fits on a prosthetic support, which is an appropriate area of the implant and / or the receiving structure, and which thus determines the relative position of the prosthesis in the mouth.
• the final denture must be configured and sized to fit perfectly with the remaining teeth of the patient's dentition, both in terms of aesthetic characteristics and functional characteristics.
• the realization of the dental prosthesis is particularly long and delicate, and can not be performed directly in the patient's mouth.
• the prosthesis is performed in the laboratory, by a dental technician, who must have a positive model, reproducing as accurately as possible the shape of the remaining dentition of the patient.
• the prosthetist must also have, on his laboratory model, the exact shape and the exact relative position of the prosthetic support, so that, once performed, the prosthesis fits perfectly on the prosthetic support in the mouth and is in principle in the appropriate relative position vis-à-vis the other teeth of the patient.
• an analogous molding piece is inserted into the overmolded impression coping, reproducing the shape of the prosthetic support and having an insertion body able to be overmoulded by a molding material;
• the impression paste and the impression cap containing the analogous molding part are used to make a laboratory model using a molding material such as a suitable plaster, and harden the molding material;
• the prosthetist can then work to perform the dental prosthesis which will then be implanted on the prosthetic support in the patient's mouth.
• the prosthetic support for fixing a prosthesis on an implant comprises a pillar intended to penetrate into a cavity of the prosthesis and limited at its base by an annular peripheral shoulder.
• the impression cap has a peripheral wall and a distal bottom wall delimiting an inner blind chamber open according to a proximal orifice, the inner chamber being able to receive the abutment of the prosthetic support.
• the impression coping must be satisfactorily retained on the prosthetic support in the patient's mouth during the impression taking. Similarly, the impression coping must satisfactorily hold the analog molding piece during the realization of the laboratory model.
• the impression coping must be manually removable with the impression paste away from the prosthetic support after polymerization of the impression paste in the mouth of the patient, and the impression coping must be easily separated from the similar molding piece after completion of the laboratory model.
• various means have already been devised to ensure the maintenance of the impression cap on a prosthetic support abutment.
• the impression copings have been retained by screwing in the implant or in the abutment during impression taking in the mouth, and the similar molding piece has been retained by screwing in the impression coping. during the realization of the laboratory model.
• the disadvantage of these systems is on the one hand the additional time required for the screwing and unscrewing of the fastening means, and especially the additional height necessary resulting both from the addition of the screw and especially the addition of the screwing tool, which makes the system difficult to perform in the mouth, particularly in the molar sector, and which can cause inaccuracies.
• US 5,688,123 discloses an impression taking cap having, at its base, resilient tongues snapping on a peripheral undercut portion of a pillar attached to an implant.
• WO 97/28755 discloses an impression coping having a lower peripheral edge snapping onto the periphery undercut of the implant.
• WO 03/037207 discloses an impression taking cap whose lower peripheral edge snaps into a peripheral groove of the pillar.
• the latching is performed in the outer peripheral zone of the prosthetic support zone disturbed by the presence of the gum. There is therefore a risk of defective impression taking, imperfect snapping.
• the document US 2006/228672 A1 discloses an impression taking cap having, in its inner chamber receiving the abutment support abutment, a retention pin capable of axially engaging in friction in a female retention geometry provided for in FIG. the end of the pillar.
• the retention pin comprises a blind axial hole and longitudinal slots defining radially protruding flexible longitudinal tongues snapping into an annular groove of the female retention geometry.
• a disadvantage of snap-fastening systems is that the latching function determines a unique axial orientation and axial position of the impression cap on the prosthetic support, without taking into account the axial orientation and the axial relative position of the lower edge of the impression coping with respect to annular circumferential recess of the prosthetic support.
• the latching devices can thus ensure the sealing of the prosthesis only on the condition of making very precise impression copings and perfectly adapted to the shape of the prosthetic supports, which is difficult and expensive to achieve.
• the problem proposed by the present invention is to design a new device for retaining an impression cap on a prosthetic support making it possible to avoid the drawbacks of known devices, in particular ensuring a safer positioning of the take-up cap. impression to ensure a good subsequent sealing of the dental prosthesis.
• the retaining device according to the invention allows a reversible manual engagement of the impression coping both vis-à-vis a prosthetic support for fixation on an implant than vis-à-vis a similar molding part for carrying out a laboratory molding.
• the size of the device is reduced, and allows for a precise impression in the mouth, including the molar sector.
• the device of the invention is fast and simple to use, and in particular does not require screwing or unscrewing.
• the invention applies both to an implant system with implant-only prosthetic support or to a prosthetic abutment-supported implant system, or to an implant system with a mixed prosthetic support on an implant and a pillar.
• the prosthetic support can be located either on the implant or on the abutment, or partly on the abutment and partly on the implant.
• the invention also applies to the production of prostheses having various modes of attachment, in particular a fixation by sealing, a fastening by screwing, a fastening snap.
• the invention proposes, according to a first aspect, an impression cap intended to cooperate with a prosthetic support of an implant or a prosthetic implant-prosthesis assembly.
• the support prosthetic having a pillar for penetrating into a cavity of a dental prosthesis and limited at its base by an annular peripheral shoulder, the pillar having a female retention geometry provided at its end, the impression cap having a peripheral wall and a distal bottom wall delimiting an open inner blind chamber according to a proximal orifice, the inner chamber being adapted to receive the abutment and the annular peripheral shoulder of the prosthetic support, the impression cap having an annular facet of support around the proximal orifice and shaped to abut axially on the annular peripheral shoulder of the prosthetic support, the impression cap comprising a retention pin, developing axially from the bottom wall in the chamber interior, and adapted to axially engage in friction in the female retention geometry provided at the end of the pillar, the retention pin comprising a male retention section having an outer peripheral surface of cylindrical shape of revolution adapted to come into axial engagement in a corresponding cylindrical surface female retention section of the female retention geometry.
• the retention means of the impression coping which operate by friction alone during axial engagement, correctly perform their role of retention regardless of the axial position of the impression taking cap with respect to the prosthetic fixation support, so that the practitioner can engage the impression taking cap until it comes to rest by its annular support surface against the annular peripheral shoulder of the prosthetic support , and the impression cap then remains in this position thanks to the friction retention means which, by the cylindrical male and female retention sections, provide a satisfactory retention force.
• the positioning of the impression taking cap is reliable, and this makes it possible subsequently to ensure a good peripheral seal of the prosthesis on the implant.
• the inner chamber is shaped to receive the abutment leaving an axial and radial clearance between the walls of the impression cap and the abutment when the annular support facet abuts on the annular peripheral shoulder of the abutment. prosthetic support. In this way, it favors the contact of the impression cap on the annular peripheral shoulder of the prosthetic support, to further ensure the subsequent sealing of the prosthesis.
• the shape of the prosthetic support and / or the annular facet of support of the impression taking cap may be of revolution.
• the inner chamber has relative locking shapes in axial rotation, able to cooperate with corresponding forms of the pillar .
• the capture pin of the impression cap is dimensioned and structured so that it engages in force in the female geometry of retention of the pillar, and that the frictional retaining force between the retention pin and the abutment retention female geometry is sufficient to support the tearing forces during an impression taking in the mouth and the realization of a model in the laboratory, while allowing a reversible manual axial engagement of the coping cap. Impression taking on the prosthetic support.
• the retention pin may advantageously have a cylindrical shape of revolution. Such a shape is easy to make by molding, which facilitates the realization of an impression cap. It also facilitates manipulation for adaptation or removal of the impression cap, because there is no need to respect an angular orientation around the axis of the implant.
• the male retention portion of the retention pin may have an axial height much smaller than its diameter, and may then form a peripheral annular protruding protruding cylindrical crown, separated from the bottom wall by a diameter connecting section reduced.
• the retention means leave the impression cap an angular deflection capacity on either side of the direction of the longitudinal axis.
• the impression coping can thus fit more closely around the periphery of the peripheral annular shoulder, to further guarantee the subsequent sealing of the prosthesis.
• the axial height of the male retention section determines the surface of the friction zone between the retention pin and the female retention geometry, making this surface independent of the axial position of the impression cap on the support. prosthetic. The axial retention force of the impression cap on the prosthetic support is thus better controlled.
• the impression cap comprises a flared outer peripheral rim, able to keep the gingiva away during the placement of the impression cap on the implant.
• the invention proposes a dental implant capable of cooperating with an impression coping and having a prosthetic support for fixing a dental prosthesis, the prosthetic support having a pillar intended to penetrate a prosthetic cavity.
• the dental implant comprising, at its distal end, a female retention geometry adapted to receive axially in friction a retention pin provided in the inner chamber of the holding cap.
• the female retention geometry comprising a female retention section having a cylindrical inner surface e adapted to receive in axial engagement a male retention portion of the retention pin.
• the implant is adapted to receive the impression cap defined above, the assembly ensuring a reliable transfer of the position of the prosthetic support to a laboratory model.
• the female retention section has an axial height preferably much smaller than its diameter, the female retention section forming an inner annular rib projecting from the bottom of the female retention geometry by a section of female geometry retention with increased diameter undercut.
• the effects obtained are similar to those obtained by a male section of retention of axial height determined.
• the invention proposes a prosthetic piece able to form, with an implant, a prosthetic support having a pillar intended to penetrate into a cavity of the prosthesis and limited at its base by an annular peripheral shoulder, the assembly being adapted to cooperate with an impression cap having a peripheral wall and a distal bottom wall delimiting an open internal blind chamber according to a proximal orifice, the inner chamber being able to receive the abutment and the annular peripheral shoulder of the prosthetic support , the prosthetic part comprising, at its distal end, a female geometry of retention designed to receive axially in friction a retention pin provided in the inner chamber of the impression cap, the female retention geometry comprising a female retention section having an inner surface of cylindrical shape adapted to receive in axial engagement a male retention section of the retention pawn.
• the female retention section has an axial height preferably much smaller than its diameter, the female retention section forming an inner annular rib projecting from the bottom of the female retention geometry by a section of female geometry retention with increased diameter undercut.
• the retention means leave the impression cap an angular deflection capacity on either side of the direction of the longitudinal axis.
• the impression taking cap can thus fit more tightly over the entire periphery of the annular peripheral wrap, to further guarantee the subsequent sealing of the prosthesis.
• the female fixed height retention section determines the retaining force of the impression cap.
• the female retention section of the prosthetic part may have a cylindrical inner surface of revolution with longitudinal grooves regularly distributed around the female retention geometry.
• the invention proposes a similar molding piece, able to reproduce the exact shape of a prosthetic abutment support and annular peripheral shoulder in a laboratory model, comprising an insertion body able to be overmoulded by a molding material and surmounted by a protuberance having the external shape of the pillar and limited at its base by a shoulder having the relative position and the external shape of the annular peripheral wrap of the prosthetic support, the distal portion of the protuberance comprising a female retention geometry adapted to receive axially in friction a retention pin provided in the inner chamber of an impression cap;
• the female retention geometry comprises a female retention section having a cylindrical inner surface adapted to receive, in axial engagement, a male retention section of the retention pin.
• the female retention section has an axial height preferably much smaller than its diameter, the female retention section forming an inner annular rib projecting from the bottom of the female retention geometry by a section of female retention geometry with increased undercut diameter.
• the retention means leave the impression cap an angular deflection capacity on either side of the direction of the longitudinal axis.
• the impression taking cap can thus fit more closely over the entire periphery of the annular peripheral shoulder, to further guarantee the subsequent sealing of the prosthesis. And by this structure is still controlled the retaining force of the impression cap on the prosthetic support.
• the female retention section of the similar molding piece may have a cylindrical inner surface of revolution with longitudinal grooves evenly distributed around the female retention geometry.
• the invention proposes an impression cap assembly for transferring to a laboratory model the relative position of the prosthetic support for fixing a prosthesis on an implant in position in the mouth, comprising:
• a coping cap as defined above, an implant as defined above and / or a prosthetic piece as defined above,
• FIG. 1 to 3 illustrate three known embodiments of a prosthetic support for fixing a prosthesis on an implant
• FIG. 4 is a side view of an implant assembly or the like impression coping according to a first embodiment of the present invention
• FIG. 5 is a diametral section of the implant assembly or the like - impression cap of Figure 4;
• FIG. 6 is a side view of an implant - prosthetic component - impression coping assembly, illustrating a second embodiment of the present invention
• FIG. 7 is a diametral section of the assembly of FIG. 6; - Figures 8, 9, 10 and 11 illustrate, in cross section, four embodiments of the corresponding lateral surfaces of the female retention geometry and the retention pin; and
• FIG. 12 illustrates, in longitudinal section, the retaining means of the impression cap on a prosthetic support, according to another embodiment.
• FIGS. 1 to 3 are firstly considered which illustrate three embodiments of a prosthetic prosthesis fixation support to which the present invention can be applied.
• a single-piece implant 1 comprising a fixing base 1 a, a pillar 2, and an intermediate annular peripheral rib 3, one face of which faces the pillar 2 and defines an inclined annular peripheral shoulder 4 limiting the base of pillar 2.
• FIG. 2 the same external shape is found, but the assembly is formed of two parts added to each other, comprising the implant 1 (comprising only the fixing base 1a of FIG. 1), and a prosthetic part 5 which itself forms the pillar 2 and the inclined annular peripheral shoulder 4.
• the assembly also consists of two parts, the implant 1 again comprising the fixing base 1a and also the intermediate annular peripheral rib 3 forming the inclined annular peripheral shoulder 4, while the prosthetic component 5 only includes pillar 2.
• the segment 24 constituted by the pillar 2 and the inclined annular peripheral shoulder 4 constitutes the prosthetic support for fixing a prosthesis on the implant, that is to say the surface intended for ensure correct positioning and fixation of the dental prosthesis that is subsequently attached to the implant.
• FIGS. 4 and 5 which illustrate a first embodiment of the invention, are now considered.
• This first embodiment corresponds to a one-piece implant according to Figure 1, or to a similar piece of molding integrally.
• the outer lateral surface of the fastening base 1a is structured in a known manner to allow it to be anchored.
• it is a similar molding piece intended to be used with a paste of molding.
• the outer lateral surface of the fastening base 1a has, as illustrated, deep undercuts capable of ensuring satisfactory anchoring in a molding paste.
• the outer lateral surface of the fixing base 1 has, in a known manner, streaks adapted to good impact anchoring in a corresponding hole prepared in the bone of a jaw, or screw threads. Only the outer side surfaces of the fastening base 1 are different depending on whether it is an implant or a similar molding piece.
• the distal end 2a of the pillar 2, or end opposite the fixing base 1a comprises a female retention geometry 2b, in the form of an axial hole opening on the face of end and limited by a side wall parallel to the longitudinal axis 11 of the pillar 2.
• An impression coping 6 may be attached to the prosthetic fixation support constituted by the pillar 2 and by the inclined annular peripheral shoulder 4, as illustrated in FIG. 5.
• the peripheral outer surface of the impression cap 6 is shaped to allow it to be anchored in an impression paste which overmouldes it during the impression taking step. in mouth.
• the anchoring makes it possible to avoid separation of the impression cap from the impression paste once polymerized.
• the impression coping 6 comprises a peripheral wall 7 and a distal bottom wall 8 delimiting together an open interior chamber 9 which is open according to a proximal orifice 10.
• the inner chamber 9 is suitable for receive all of the pillar 2 and the annular peripheral shoulder 4 of the prosthetic support 24.
• the impression coping 6 further comprises an annular support surface 11, which surrounds the proximal orifice 10 and which may advantageously constitute a complementary surface of the peripheral annular shoulder 4 of the prosthetic support 24. It can be seen that, when the impression coping 6 is adapted in position on the implant 1 or similar molding part according to this embodiment, with the annular support face 11 bearing against the annular peripheral shoulder 4, an axial play There remains, as well as a small radial clearance 20, between the outer surface of the pillar 2 and the inner surface of the walls of the impression cap 6.
• the impression coping 6 further comprises a retention pin 13, developing axially from the bottom wall 8 in the inner chamber 9, and shaped to engage axially in friction in the female retention geometry 2b of the pillar 2.
• a female retention geometry 2b at the end of the pillar 2, receives and retains axially by only friction the retention pin 13 and the impression cap 6.
• the retention pin 13 is of cylindrical shape of revolution. Its manufacture is easy. Its positioning is also easy because it does not require angular indexing around the axis ll.
• the female retention geometry 2b may also have a form of revolution complementary to the shape of the retention pin 13.
• the female retention geometry 2b may have a polygonal cross-section in which the cylindrical shape of the retention pin 13 may also be inserted in friction.
• the female retention geometry 2b may have, at least in the female retention section 2c, a cylindrical inner surface of revolution 20b with longitudinal grooves 21b, 22b, 23b and 24b regularly distributed around the female 2b retention geometry.
• FIG. 9 illustrates an embodiment with two longitudinal grooves 21b and 22b that are diametrically opposed and have a transverse profile in an arc of a circle.
• FIG. 10 illustrates an embodiment with four longitudinal grooves 21b, 22b, 23b and 24b distributed at 90 ° and with an arcuate transverse profile.
• FIG. 11 illustrates an embodiment with three longitudinal grooves 21b, 22b and 23b distributed at 120 ° and with an arcuate transverse profile. Such arcuate profile grooves are easy to make.
• the eccentricities and radii of the circles are chosen so as to maintain sufficient bearing areas in the cylindrical surface 20b.
• the female retention geometry 2b comes into contact with the retention pin 13, in a plurality of reduced surface friction zones, separated by gaps (the grooves 21b-24b) which reduce the radial rigidity of the friction assembly, due to the radial deformation of the retention pin 13 as seen in the figures.
• the assembly and disinsertion effort of the impression taking cap 6 is thus better controlled, constant and reproducible.
• the depth of the female retention geometry 2b, or length along the longitudinal axis 11, is sufficient for the penetration of the retention pin 13 without the end of the retention pin 13 abutting in the bottom of the female retention geometry 2b when the impression coping 6 is in the impression-taking position shown in FIG. 5. It can thus be seen in FIG.
• the female geometry of the Retention 2b as illustrated comprises a female retention section 2c having, along the longitudinal axis 11, a determined axial height h1.
• An enlarged diameter second section separates the bottom of the female retention geometry 2b and the female retention section 2c, so that the female retention section 2c forms a projecting inner annular rib, whose cylindrical apex engages the cylindrical side wall of the retention pin 13. This ensures a good control of the frictional retaining force of the impression cap 6 on the pillar 2. In particular, this retaining force does not depend on the dispersion possible relative axial positions of the annular peripheral shoulder 4 and the distal end 2a of the pillar 2.
• the axial height h1 of the female retention section 2c is much smaller than its diameter D, for example less than a quarter of its diameter D. This ensures a capacity for slight angular deflection of the impression cap 6 to the distance from the direction of the longitudinal axis ll, as illustrated by the double arrow 6a.
• the impression coping 6 can thus fit more tightly over the entire periphery of the annular peripheral shoulder 4, to further guarantee the subsequent sealing of the prosthesis.
• the diameter D of the female retention section 2c equal (to the functional clearance near) to the diameter of the retention pin 13, can advantageously be chosen to be much smaller than the diameter of the pillar 2, to further promote the angular deflection capacity 6a of the cap of impression taken 6 away from the direction of the longitudinal axis ll.
• a female retention geometry 2b can be provided as illustrated in FIG. cylindrical or prismatic engaging a cylindrical retention pin 13 having itself a male portion retention member 2d forming a protruding peripheral annular rib and a connecting section 2f with reduced undercut diameter.
• the impression coping 6 as illustrated in Figure 5 further comprises an outer peripheral flange 14 flared, able to keep the gingiva away during the establishment of the impression cap 6 on the implant 1 in the patient's mouth.
• the implant 1 (or the analogous molding part) is thus itself able to receive the impression cap 6, and it comprises, at its distal end, the geometry female 2b of retention adapted to receive axially in friction the retention pin 13 provided in the inner chamber 9 of the impression cap 6.
• FIGS. 6 and 7, which illustrate an implant 1 according to another embodiment of the invention, adapted for fastening by screwing, and receiving a prosthetic component 5 as previously described in relation with FIG.
• FIG. 7 is a sectional view of the implant 1, which comprises the retention base 1a and the external annular peripheral annular rib 3, the distal face of which defines the inclined annular peripheral shoulder 4.
• the implant 1 comprises an assembly cavity 1b with a conical section 1c and a threaded axial hole 1d for receiving and fixing a conical fastening body 5a and a threaded fastening rod 5b of the prosthetic piece 5. fixation of the prosthetic part 5 in the implant 1 is done by screwing, and the prosthetic part 5 comprises, for its drive, an axial operating cavity 5c accessible from the end 2a of the pillar 2.
• the assembly forms a part similar to the one-piece implant 1 of FIG.
• the outer surface of the fixing base 1a comprises a self-threading thread adapted for fastening the implant by screwing into the bone.
• the outer shape of the prosthetic support 24, also constituted in this embodiment of FIG. 7 by the pillar 2 and the inclined annular peripheral shoulder 4, is the same as the outer shape in the previous embodiment of FIG. 5.
• the same impression coping 6, having the same shape as previously described, can be adapted to the implant assembly 1 - prosthetic component 5 of FIG. 7.
• the impression coping 6 fits around the pillar 2 with an axial clearance 12 and a radial clearance 20, bearing by its annular support surface 11 on the inclined annular peripheral shoulder 4, and being held in position by the retention pin 13 engaged in friction in the female retention geometry 2b of the pillar 2.
• the operating cavity 5c extends the female retention geometry 2b towards the fixing base 1a, and has a diameter smaller than that of the female retention geometry 2b.
• the prosthetic part 5 is thus able to form, with the implant 1, a prosthetic support 24 to cooperate with the impression coping 6 and with the prosthesis subsequently formed, and the workpiece At its distal end, the prosthetic prosthesis 5 comprises the female retention geometry 2b capable of axially receiving in friction the retention pin 13 present in the internal chamber 9 of the impression coping 6.
• the conical assembly (conical section 1c) between the implant 1 and the prosthetic component 5 induces, due to manufacturing tolerances, a dispersion in the relative axial locking position of the prosthetic component 5 in the implant.
• implant 1 Because the annular peripheral shoulder 4 is then made by the implant 1 while the female retention geometry 2b is made by the prosthetic part 5, the penetration of the retention pin 13 in the female retention geometry 2b may vary. It is then very advantageous to provide a retaining retention section 2c retention structure, which determines and maintains constant the friction surface that produces the retaining force, regardless of the penetration of the retention pin 13.
• the impression coping 6 comprises a hollow retention pin 13 provided with a blind axial hole 13a open towards the inside and defining a tubular structure.
• a tubular structure because of the reduced thickness of its wall, is elastically deformable under radial stress.
• Such radial elastic deformation is illustrated in FIGS. 9, 10 and 11, in which the retention pin 13 is deformed radially to fit the non-circular contour of the female retention geometry 2b, bearing against the cylindrical portions of the surface 20b, and engaging in the longitudinal grooves 21b, 22b, 23b, 24b.
• the elasticity of the tubular structure of such a retention pin 13 has two advantageous effects. The first effect is to compensate for any dispersions of respective radial dimensions of the retention pin 13 and the female retention geometry 2b, in order to guarantee the retention of the frictional retaining force in a range of acceptable values.
• the second effect is to give the impression coping 6 a slight angular deflection capacity 6a away from the direction of the longitudinal axis I-1.
• the impression coping 6 can thus fit even better over the entire periphery of the annular peripheral shoulder 4, to further guarantee the subsequent sealing of the prosthesis.
• the implant 1 as illustrated in the previous figures, in the monobloc variant of FIG. 5 or in the prosthetic part variant of FIG. 7, associated with an impression taking cap 6, makes it possible to identify accurately the position of the annular peripheral shoulder 4 in the patient's mouth.
• the impression coping 6 is axially adapted in force on the prosthetic support 24, that is to say on the pillar 2 and the annular peripheral shoulder 4, and then an impression taking paste is applied around the impression coping 6 and around the patient's teeth. After taking the impression paste, it is removed, taking care to simultaneously remove the impression cap 6 away from the implant 1.
• An analog molding piece 1 such as that illustrated in FIGS. 4 and 5, which has the exact external shape of the prosthetic abutment support 2 and the annular peripheral shoulder 4 of an implant or implant-prosthetic part assembly, is used for this purpose. present in the patient's mouth.
• the analog molding piece 1 is a prefabricated part having the exact shape of the prosthetic support of the implant that the practitioner has chosen to insert into the patient's mouth.
• This analogous molding part 1 thus comprises an insertion body capable of being overmoulded by a molding material, the insertion body being surmounted by a protuberance having the external shape of the pillar 2, limited at its base by a shoulder having the relative position and the external shape of the annular peripheral shoulder 4 of the prosthetic support 24.
• the distal portion of the protuberance comprises a female retention geometry 2b, adapted to receive axially in friction retention pin 13 of the impression cap 6, and preferably comprising a female retention section 2c and a section 2e increased diameter.
• the similar molding piece is fitted into the inner chamber 9 of the impression cap 6 itself partially or completely embedded in the impression paste, until it is inserted axially into force.
• a molding material such as a cast
• the device is furthermore designed to prohibit the relative axial rotation of the impression cap.
• the inner chamber 9 is limited by a portion of the peripheral wall 7 shaped flat 7a, while the peripheral wall of the pillar 2 also comprises a complementary flat portion 20a.
• the annular peripheral shoulder 4 has a frustoconical shape of revolution with an apex oriented towards the distal end of the implant 1 or of the prosthetic component 5.
• the invention however applies to all other forms of annular peripheral shoulders capable of performing the function of axial stop and the peripheral sealing function of the prosthesis.
• the impression cap 6 is a one-piece piece which has a peripheral wall 7 and a bottom wall 8 which are both solid.
• the invention also applies to impression copings made by assembling several parts, for example with a retention pin 13 in the form of an insert and fixed on a cap body forming the peripheral wall. , or in the form of an added bottom wall 8 having a retention pin 13.
• FIGS. 5 and 7 may illustrate this, considering that the retention pin 13 is a cylindrical piece which continues to the upper face of the impression taking cap 6 according to the dotted lines marked by the diameter D. Achieving an impression cap by assembling two pieces can be easier and more accurate. Indeed, this allows a more precise control of the size of the retention pin 13, because it can achieve this control before assembly. This dimension of the retention pin 13 has a very large influence on the retaining force of the impression coping.
• the impression coping 6 can be made of a machined plastic such as a medical grade polycarbonate.
• the retention pin 13 may have an inside diameter of approximately 1.1 mm, and an outside diameter D of 1.72 mm (+ 0.02-0).
• the female retention geometry 2b may have a nominal diameter of 1.65 mm (+ 0.01-0), with longitudinal grooves, and the female retention section 2c may have an axial height h1 of about 0.3 mm.
• the invention also applies to impression copings having in their walls one or more orifices allowing the impression taking product to penetrate around the prosthetic support. Such a configuration makes it possible to note any alterations of this prosthetic support.

Landscapes

• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Orthopedic Medicine & Surgery (AREA)
• Dentistry (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Prostheses (AREA)
• Dental Prosthetics (AREA)
• Pens And Brushes (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38137630

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (6)

Family Cites Families (13)

• 2006
  • 2006-11-20 FR FR0655002A patent/FR2908629B1/fr active Active
• 2007
  • 2007-11-20 WO PCT/IB2007/054716 patent/WO2008062367A2/fr active Application Filing
  • 2007-11-20 EP EP07859362A patent/EP2088957A2/de not_active Withdrawn
  • 2007-11-20 US US12/515,515 patent/US20100167239A1/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events