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
  • A61C8/0018—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the shape
  • A61C8/0022—Self-screwing
• • 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
  • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
  • A61C8/0075—Implant heads specially designed for receiving an upper structure
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
  • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
  • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
  • A61B17/86—Pins or screws or threaded wires; nuts therefor
  • A61B17/8605—Heads, i.e. proximal ends projecting from bone
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
  • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
  • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
  • A61B17/86—Pins or screws or threaded wires; nuts therefor
  • A61B17/8625—Shanks, i.e. parts contacting bone tissue
  • A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper

Definitions

• the present invention relates to the field of implants and more particularly dental implants used for the placement of one or more dental prostheses to replace one or more missing teeth in order to restore to the patient, partially or totally edentulous, a chewing function and / Or oral comfort and / or better aesthetic appearance and / or better dental occlusion.
• a dental implant usually consists of a main body anchor said socket, provided with an external thread and an internal thread, intended to take place in the maxilla and / or mandible previously pierced to receive the socket.
• the external thread is advantageously self-tapping so as to allow screwing into the wellbore of the jaw provided for this purpose, said thread having a diameter just greater than the diameter of the wellbore.
• the socket has at its end said upper, in contact with the oral medium after implantation, an implant neck adapted to receive a prosthetic system, commonly called false stump for the realization of a sealed dental prosthesis, said false stump being secured to the implant by means of the tapping of the socket, or a connector adapted to receive a so-called screwed dental prosthesis.
• a prosthetic system commonly called false stump for the realization of a sealed dental prosthesis, said false stump being secured to the implant by means of the tapping of the socket, or a connector adapted to receive a so-called screwed dental prosthesis.
• buried two-stage surgical technique There are several surgical procedures for implanting dental implants, the so-called buried two-stage surgical technique and the technique in a so-called non-buried surgical procedure. Each of these techniques corresponds to one type of implant.
• the surgeon after opening the patient's gingiva prepares the wellbore, commonly called implant bed, in the maxillary or mandible of the patient. The surgeon then places the implant consisting of a generally cylindrical sleeve and then closes the gingiva over the implant with sutures.
• This step of burying the implant under the gum consists of a step of placing in a nurse, for a period of between 3 to 6 months, which allows the integration of the implant into the bone. After this step of 3 to 6 months, a second surgical phase is necessary.
• the surgeon incises the gingiva above the upper part of the implant to set up either a healing room or directly a false stump or a connector for screwed prosthesis. This healing phase makes it possible to prepare the contour of the gingival tissues. After healing, usually after 15 days to 1 month, the final prosthesis is put in place either by sealing on the abutment screwed to the upper end of the socket or by screwing on the connector provided for this purpose.
• This surgical technique and the implants adapted to this technique, have the disadvantage of requiring two surgical procedures and significantly reduce the time of establishment of the final dental prosthesis.
• a time of reconstruction of the maxillary bone graft can come to burdens at this implant placement time, a bone graft may be necessary if the implantation area has a bone of insufficient volume.
• the implantation of the implant can be done in a single surgical time by the so-called non-buried technique. Indeed, studies have shown that implants set up in a surgical time can be implanted in the jawbone with the same success as the implants placed in buried technique.
• the surgeon sets up the implant consisting of a generally cylindrical, conical, or cylindro-conical socket provided with a thread and at the upper end of which is located an implant neck adapted to receive the prosthetic system.
• Implant placement is either by opening the gingiva above the implantation area or by passing directly through the gingiva according to the so-called transmucosal technique and then by practicing an implantary well at the chosen depth according to the patient's bone volume, the length of the implant determining the depth of said implant pit.
• said gingiva In the case of the placement of the implant by incision of the gum, said gingiva, after the introduction of the implant, is closed around the implantary neck secured to the body of the socket by stitches (technical said flap), the implant neck remaining in contact with the oral medium.
• said gingiva In the technique of implantation of the implant by the transmucosal technique, it is not necessary to suture the gingiva which fits perfectly around the implant neck in contact with the oral medium.
• the implant collar is closed by a cover screw during the bone and gum healing phase.
• the closure screw is removed to set up the prosthetic system on the implant neck, the prosthetic system being adapted to the type of prosthetic concept chosen by the surgeon such as a dental prosthesis sealed on a false stump or a prosthesis screwed on a suitable connector. It will be observed that the closure screw has a height adapted to the gingival height, usually of the order of 1, 5 mm to 2 mm.
• Such implants are described, for example, in French patent applications FR 2 747 031, FR 2 747 032 and FR 2 709 660.
• the European patent application EP 0 997 112 describes a set of dental implants comprising a globally frustoconical threaded anchoring body provided at its upper end with a cup and intended to be inserted. in the bone wall, extended by a hexagon, the space between the anchor body and the hexagon receiving a superstructure or a secondary component that bears on the outer surface of the conical section of the annular groove.
• This type of implant comprising such a cup provides, by its partial burial in the bone, and its diameter differential with the coronal shaft, the maximum latitude to correct the implant axis and allows for a “Morse taper effect" "Antirotational blocking with the cap.
• this type of implant does not significantly improve bone retention after implantation.
• Numerous studies have shown that, in the so-called buried technique, after the prosthetic connection has been placed, a bone resorption of about 1 mm follows during the first year due to the fact that the bone tends to recreate its own biological distance after the prosthesis-implant junction, in this case said junction is at the bone level.
• This bone resorption can provide a microbial entry door which, depending on the type of prosthetic connection, allows microbial infiltration due to a lack of hermeticity between the abutment or the prosthetic connection and the socket of the implant.
• the prosthetic junction is located at a distance of about 1.5 mm from the bone, thus making it possible to respect the biological distance.
• the French patent application FR 0852044 filed by the Applicant describes a dental implant ensuring the maintenance of bone and therefore a stability of peri-implant soft tissue during the placement of an implant in a surgical time or two surgical times.
• This dental implant comprises a central body said anchoring revolution adapted to be implanted in a hole made in a bone of a patient, and an implantary neck integral with the anchoring body adapted to receive a prosthetic system.
• the diameter of the base of the implant neck is smaller than the diameter of the generatrix of the upper end of the anchor body to form a flat part between the upper end the anchoring body and the base of the implant collar to provide bone growth and retention around the implant neck after implant placement.
• the flat is inclined from the base of the implant neck to the upper generatrix of the anchor body towards the lower end of said anchor body.
• Said flat is inclined at an angle less than or equal to 45 ° with respect to a plane orthogonal to the axis of revolution of the anchoring body and the implant neck, and preferably at an angle between 10 ° and 30 °.
• an implant comprising a central body said anchoring revolution adapted to be implanted in a hole made in a bone of a patient, and an implantary neck integral with the body of anchorage adapted to receive a prosthetic system, the diameter of the base of the implant neck being less than the diameter of the generatrix of the upper end of the anchoring body to form an annular flat between the upper end of the anchor body and the base of the implant collar; said implant is remarkable in that said flat includes at least one annular groove whose bottom extends below the generatrix of the upper end of the anchoring body to form a reservoir adapted to receive a liquid effusion produced by the the patient's bones and what the body anchoring comprises means for guiding said effusion to the reservoir formed the
• the width of the annular groove is preferably substantially equal to the width of the annular flat.
• the annular flat may include a plurality of concentric annular grooves.
• annular groove has a rounded profile or a V-shaped profile or U.
• the implant neck has a first portion whose outer wall flares from its base having a concavity and a second portion flaring with a convexity.
• the implant neck has a first portion whose outer wall flares from its base having a concavity and a second frustoconical portion tapering from the first portion to its distal end.
• the anchor body consists of a generally cylindro-conical bushing and having at least one thread.
• the sleeve has between two successive threads a straight wall. Said walls of the bushing extending between two successive threads of the bushing are cylindrical.
• the cylinders forming the walls of the sleeve extending between two successive threads have a diameter decreasing from the basal end to the apical end of the sleeve.
• Said bush has a first generally apical apical portion flaring from its lower end and a second generally cylindrical upper portion extending the conical apical portion.
• the generally conical apical portion of the sleeve has a first thread and in that the upper portion of the sleeve has a second thread whose pitch is smaller than the pitch of the first thread.
• Said upper portion of the sleeve comprises a so-called lower subassembly cylindrical and a subset said frustoconical upper shrinking from the lower subassembly to the annular flat.
• the upper subassembly has a side wall forming an angle between -0.1 and -15 ° with the axis of revolution of said socket.
• FIG. 1 is a side view of the dental implant according to the invention
• FIG. 2 is a longitudinal sectional view of the dental implant according to the invention shown in FIG. 1;
• FIGS. 3A and 3B are longitudinal sectional views of the dental implant positioned in a well bore practiced in FIG. a maxillary respectively before and after the bone reconstruction,
• FIG. 4 is a detail of a view in longitudinal section of the annular groove formed in the flat surface of the implant according to the invention
• FIG. 5 is a detail of a longitudinal sectional view of a first variant; of execution of the annular groove formed in the flat part of the implant according to the invention
• FIG. 6 is a detail of a longitudinal sectional view of a second variant of the annular groove formed in the flat surface of the implant according to the invention.
• FIG. 7 is a detail of a longitudinal sectional view of a third embodiment of the annular groove formed in the flat of the implant according to the invention.
• FIG. 8 is a side view of an alternative embodiment of the anchoring body of the implant according to the invention
• FIG. 9 is a perspective view of another alternative embodiment of the anchoring body of the implant according to the disk-shaped invention.
• FIG. 10 is a perspective view of another alternative embodiment of the anchoring body of the implant according to the disk-shaped invention.
• FIG. 11 is a side view of another variant of FIG. execution of the anchoring body of the implant according to the invention,
• FIG. 12 is a side view of a last variant embodiment of the anchoring body of the implant according to the invention.
• FIG. 13 is a longitudinal sectional view of the dental implant whose implant neck is capped by a prosthetic component according to the invention
• FIG. 14 is an exploded longitudinal sectional view of the dental implant, the implant neck of which can be capped by a prosthetic component according to the invention shown in FIG. 13,
• FIG. 15 is an exploded perspective view from below of the dental implant according to the invention shown in FIG. 14,
• FIG. 16 is a perspective view from above of the dental implant according to the invention shown in FIGS. 14 and 15,
• FIG. 17 is a perspective view of a abutment comprising angular indexing means and capable of cooperating with an implant according to the invention
• FIG. 18 is a perspective view of a detail of the abutment represented. in Figure 17,
• FIG. 19 is a view in longitudinal section of an alternative embodiment of the implant according to the invention adapted to receive the abutment depicted in FIGS. 16 and 17;
• FIG. 20 is a view from above of FIG. variant embodiment of the implant shown in FIG.
• FIG. 21 is a longitudinal sectional view of the false abutment secured to the implant according to the invention.
• a dental implant intended to be used for the placement of one or more dental prostheses replacing one or more missing teeth will be described in this particular example; however, it is obvious that the implant according to the invention may be used in any other part of the body without departing from the scope of the invention.
• the dental implant according to the invention consists of a main body said anchor 1 is in the form of a generally frustoconical sleeve 1 comprising a first lower part called apical 2 conical s flaring from its apical end and a second upper part said basal 3 cylindrical extending the apical portion 2 conical.
• This socket 1 is, for the sake of clarity of description, shown vertically and is intended to take place in the maxilla and / or mandible previously pierced to receive said sleeve 1 so that the upper end of said sleeve 1 is slightly buried under the bone or flush with the bone.
• the conical apical portion 2 of the sleeve 1 has a first thread 4 and the upper portion 3 of said sleeve 1 has a second thread 5 said micro-thread whose pitch is less than the pitch of the first thread 4.
• the apical portion 2 and the upper part 3 of the sleeve 1 have a rough and / or porous surface to allow activation of the osseointegration after implantation.
• the surface state of said sleeve is preferably sandblasted or etched sandblasted; however, it goes without saying that it may be any other similar surface condition without departing from the scope of the invention.
• the threads 4 and / or 5 form means capable of grating the walls of the hole made in the bone and into which the anchoring body 1 is introduced.
• these threads 4,5 scrape the bone to provide bone particles which mix with the effusion liquid, said effusion fluid consisting essentially of blood.
• the sleeve 1 has a slightly rounded lower end 6 allowing its use in surgical techniques of raising the sinus floor well known to those skilled in the art.
• the implant comprises an implant collar 7 extending from the upper end of the sleeve 1, the sleeve 1 and the implant collar 7 being obtained in one piece.
• This implant neck 7 comes from the upper end of the sleeve 1 having a generally conical shape, coaxial with said sleeve 1, flaring from its base, that is to say from the upper end of said sleeve 1.
• the diameter of the base of the implant neck 7 is smaller than the diameter of the generatrix of the upper end of the sleeve 1 so as to form an annular flat 8 between the upper end of said sleeve 1 and the base of the implant neck 7.
• This annular flat 8 has with reference to Figures 1 and 2 an annular groove 9 of rounded section and whose bottom extends below the generatrix of the upper end of the sleeve 1 to form a reservoir adapted to receive a liquid effusion produced by the patient's bone.
• Said annular groove 9 has, with reference to Figure 4, a width substantially equal to the width of the annular flat 9 and a ratio between the width of the annular groove 9 and the depth of said annular groove 9 less than or equal to 1, and preferably less than or equal to 0.5.
• the depth of the annular groove 9 is less than or equal to the width of said annular groove 9 and, preferably, less than or equal to half the width of said annular groove 9.
• said annular groove 9 preferably has a rough and / or porous surface to allow activation of osseointegration.
• this annular groove 9 formed in the annular flat constitutes a reservoir capable of receiving a liquid effusion, possibly containing solid elements, originating from the patient's bone.
• the solid elements may consist of biological solid elements such as bone fragments for example or in synthetic solid elements such as composite elements for example.
• Said effusion is guided to the reservoir by the threads 4,5, the microfiletage 5 also acting as a bone grater.
• the bone particles, osteoblasts, growth factors, etc., torn off by the threads 4.5 and transported by the effusion liquid to the annular groove 9 form precursors of bone recovery in the peri-zone. -implantaire.
• This annular flat 8 and this annular groove allow better bone conservation in the peri-implant region and therefore allow to maintain peri-implant soft tissue during healing.
• this one-piece design of the sleeve 1 and the implant neck 7 avoids the presence of a seal in the region critical for bone preventing microbial infiltration and represents a zone of proliferation and densification for soft tissues. .
• the implant neck 7 comprises a first portion 10 whose outer wall flares out from its base by having an outwardly oriented concavity and a second part 1 1 whose outer wall flares out with an outwardly convexity .
• the outer wall of the implant neck 7 has a machined surface condition that is generally smooth or not.
• the upper end of the implant neck 7 has an outer diameter greater than the outer diameter of the upper end of the sleeve 1.
• the diameter of the sleeve 1 may vary according to the anatomy of the patient's bone so that the upper end of the implant neck 7 may have a diameter less than or equal to the diameter of the upper end. of the sleeve 1, and this according to the diameter of the implant used, the diameter of the implant neck being constant regardless of the diameter of the sleeve, without departing from the scope of the invention.
• the wellbore commonly called the implant bed
• the implant bed is prepared in the maxillary or mandible of the patient according to a technique well known to those skilled in the art.
• surgeon introduces the socket 1 into the wellbore until the end upper of said sleeve 1, and the annular groove 9, are slightly buried below the bone level (O) 1 as shown in Figure 3A.
• the micro-threading 5 acts as a bone grater providing bone particles that mix with the effusion liquid.
• Said effusion which comprises bone particles, osteoblasts, growth factors, etc. is guided by the threads 4.5 to the annular groove 9 forming a reservoir.
• Bone particles, osteoblasts, growth factors, etc. contained in the reservoir formed by the annular groove 9 are precursors of bone recovery in the peri-implant zone.
• This annular flat 8 and this annular groove 9 thus allow better preservation of bone in the peri-implant region and therefore allow to maintain peri-implant soft tissues during healing.
• a bone part (O) has formed in the annular groove 9 and the soft tissues (M) bear on the first part 10 implant neck 7, whose outer wall flares from its base with an outwardly oriented concavity, and on the second part 11 of said implant neck 7 whose outer wall flares out with a convexity oriented towards the outside.
• the annular groove 9 of rounded section is substituted by an annular groove 9 having a width substantially equal to the width of the annular flat and section in general V-shaped or U-shaped, shown in phantom in Figure 5, the bottom of said annular groove extending below the generatrix of the upper end of the sleeve 1.
• the annular groove 9 of rounded section is substituted by two concentric annular grooves 9a and 9b, the annular flat 8 extending in a plane perpendicular to the axis of revolution of the socket 1 of the implant.
• the two concentric annular grooves 9a and 9b have an identical depth; however, he is well evident that said annular grooves 9a and 9b may have different depths, the bottom of each of the grooves extending below the generatrix of the upper end of the sleeve 1, without departing from the invention.
• each of the concentric annular grooves 9a and 9b may have a section of any shape.
• the implant according to the invention may comprise any number of annular grooves 9, each of the grooves 9 extending in all or part of the circumference of the annular flat without departing from the scope of the invention.
• the annular flattened portion 8 is inclined from the base of the implant neck 7 towards the upper generatrix of the sleeve 1 in the direction of the end. bottom of said sleeve 1 at an angle ⁇ relative to a plane orthogonal to the axis of revolution of the sleeve and the implant neck 7.
• the angle ⁇ is less than 45 ° and is approximately equal at 10 ° for example.
• the annular groove 9 formed in said annular flat has a width smaller than the width of said annular flat 8.
• the first thread 4 of the sleeve 1 is advantageously asymmetric and self-tapping.
• Said first thread 4 comprises threads whose depth p_ grows from its upper end to its lower end and whose thickness e decreases from its upper end to its lower end.
• the upper part of the threading 4 consolidates the fixation in the bone
• its middle part provides a deforming and seizing tap effect
• its lower part provides a cutting effect equivalent to that of a tapping drill by the fineness of the no screw of the lower part of the thread 4.
• Said sleeve 1 has between two successive threads of the thread 4 a straight wall.
• said sleeve 1 consists of a succession of coaxial cylindrical segments whose diameter decreases from the basal end to the apical end of the sleeve 1. Said cylindrical segments have a diameter which decreases gradually so that the straight walls between two successive threads extend parallel to the axis of revolution XX 'and parallel to each other as shown in Figure 1.
• said sleeve 1 advantageously comprises one or more helical grooves 100, preferably uniformly distributed around the sleeve 1, extending generally from its apical end, that is to say from its end lower, to micro-threading 5, and / or one or more helical grooves 101 preferably uniformly distributed around the sleeve 1 and extending from the upper end of the first thread 1 to the annular groove 9.
• the thread of the micro-threading 5 opens onto the thread of the first thread so that the upward effusion liquid along the first thread 4, during the introduction of the implant, can go up along the thread of the micro-thread 5 which opens into the annular groove 9.
• said thread With socket 1 of the implant according to the invention with reference to FIG. 9, said anchoring body 1 consists of a disc 12 forming the lower part of the anchoring body 1 and of a cylindrical rod 13 disc 12 and extending coaxially with said disc 12, the implant collar 7 being derived from the upper end of said rod 13.
• the implant comprises an implant collar
• This implant neck 7 comes from the upper end of the rod 13 and has a generally conical shape, coaxial with said rod 13 and the disc 12, flaring from its base, that is to say from the end upper of said rod 13.
• the diameter of the base of the implant neck 7 is smaller than the diameter of the generatrix of the upper end of the rod 13 to form an annular flat 8 between the upper end of said rod 13 and the base implant collar 7.
• This annular flat 8 comprises an annular groove 9 as described above.
• the rod 13 advantageously comprises a thread or a knurling 14 of not very fine to ensure better primary stabilization of the implant.
• the disk 12 advantageously comprises two generally semicircular and diametrically opposed through-holes 15. These recesses 15 allow, in addition to a material gain, a better osseointegration.
• said anchoring body 1 consists of two discs 12 and 12 ', forming the lower part of the anchoring body 1 and a cylindrical rod 13 coming from the disc 12 and extending coaxially with said disc 12, the implant neck 7 coming from the upper end of said rod 13.
• the first disk 12 said distal extending at the lower end of the cylindrical rod 13 has a diameter just greater than the diameter of the second disk 12 'said proximal.
• the recesses 15 of the distal disc 12 extend to the right of the recesses 15 'of the proximal disc 12'.
• the distance separating the two disks 12, 12 ' may be variable and may be easily adapted by the skilled person depending on the bone characteristics of the patient.
• the implant neck 7 may comprise a hexagonal recess adapted to receive the rotary mandrel of a turbine or the like, not shown in the figures, in order to rotate the anchoring body about its vertical axis. of revolution.
• the anchoring body 1 initially acts as a tool for performing a micro-osteomy by milling by cutting the bone simultaneously in the horizontal and vertical planes, then in a second time as an implant, the anchoring body 1 is separated from the turbine and left in position in the housing thus dug in the bone, as described in French patent FR 2 561 907.
• the anchoring body of the implant according to the invention with reference to FIG. 11, the latter is constituted, in the same manner as previously described with reference to FIG.
• This socket 1 is, for the sake of clarity of description, shown vertically and is intended to take place in the maxilla and / or mandible previously pierced to receive said sleeve 1 so that the upper end of said sleeve 1 is slightly buried under the bone or flush with the bone.
• the conical apical portion 2 of the sleeve 1 has a first thread 4 and the upper part 3 of said sleeve 1 has a second thread 5 said micro-thread whose pitch is less than the pitch of the first thread 4.
• the bushing 1 differs from that previously described in that the upper part 3 of the bushing comprises a so-called lower cylindrical subassembly 3a and a so-called upper frustoconical subassembly 3b narrowing from the lower subassembly 3a to the annular flattening 8.
• the upper subassembly 3b has a side wall forming an angle ⁇ between 165 and 179.1 ° with the axis of revolution XX 'of said bushing 1.
• the anchor body 1 of the implant consists of a generally frustoconical sleeve 1 comprising a first lower part called apical 2 generally conical flaring from its apical end and a second upper part said basal 3 generally cylindrical extending the apical portion 2 conical.
• the apical portion 2 of the sleeve 1 has a first thread 4 and the upper portion 3 of said sleeve 1 has a second thread 5 said micro-thread whose pitch is less than the pitch of the first thread 4.
• the apical portion 2 comprises a first subassembly said cylindrical upper 2a, said upper subassembly 2a extending just below the upper portion 3, and a second subassembly said lower 2b conical.
• the diameter of the upper cylindrical subassembly 2a is substantially equal to the diameter of the upper part 3 of said sleeve 1.
• the implant neck 7 comprises a first part 70, called the lower part, the external wall of which flares out from its base and has an outwardly oriented concavity and a so-called second portion 71. upper narrowing of generally frustoconical shape.
• the free end of the upper portion 71 of the implant collar 7 advantageously comprises three shoulders 72 uniformly distributed around the circumference of the implant neck 7 in order to form generally triangular connection means 17.
• Said implant collar 7 is able to receive a prosthetic component 16 It will be observed that this prosthetic piece 16 consists of any prosthetic piece such as a false stump for example which is only partially represented in FIGS. 12 to 15.
• This piece 16 comprises a central recess frustoconical lower portion 18 adapted to receive the frustoconical upper portion 70 of the implant neck 7 and an upper central recess 19 opening on the lower recess 17 and generally having a star shape.
• the upper central recess 19 has six branches 20 and has dimensions for receiving in three banks 20 of the central recess 19 the respective vertices of the triangular connection means 17 of the implant collar. In this way, when the piece 16 is placed on the implant neck 7, the latter is introduced into the lower central recess 18 until the tops of the triangular connecting means 17 are housed in three branches of the upper central recess 19, the practitioner choosing the branches of the upper central recess 19 according to the desired angular indexing.
• anchoring body 1 may have any shape without departing from the scope of the invention.
• the prosthetic part 16 may include an upper central recess 19 having any number of branches adapted to cooperate with the upper end of the implant neck so as to vertically guide said prosthetic part 16 prior to the joining by friction between the two parts 16 and 7 without departing from the scope of the invention.
• the part 16, which consists in this particular embodiment in a false abutment, comprises in its lower part means of connection to the anchoring body 1 consisting of a frustoconical tenon 21 adapted to be introduced into a frustoconical central recess 22 made in said anchoring body 1, with reference to FIG.
• the frustoconical pin 21 comprises on its periphery lugs 23 of generally parallelepipedal shape uniformly distributed around the pin 21 on a generator.
• said tenon 21 has six lugs 23. Said lugs
• the practitioner introduces the pin 21 of the prosthetic piece 16 into the frustoconical central recess 22 of the anchoring body by choosing the desired angular indexing, then the lugs 22 slide in the grooves 24 until the frustoconical wall of the tenon 21 bears on the wall of the frustoconical central recess 22, with reference to Figure 20, to ensure the connection between the prosthetic piece 16 and the anchoring body 1 by friction.
• the frictional fastening makes it possible to ensure a good seal between said parts 1 and 16.
• the frictional fastening between said parts is performed after the indexing between the parts thus avoiding any interaction between the indexing function and the joining function between the parts 16 and 1.
• the lugs 23 and the grooves 24 forming guiding and indexing means and on the other hand the frustoconical tenon 21 and the frustoconical central recess 22 forming the securing means may be substituted by means guide and indexing respectively securing means of different shapes without departing from the scope of the invention.
• the anchoring body 1 advantageously comprises an annular chamfer 25 between the upper end of the anchoring body and the inlet of the frustoconical central recess 22 in order to form, when the tenon 21 of the prosthetic part 16 is introduced into said frustoconical central recess 22, an annular groove 9 whose bottom extends below the generatrix of the upper end of the sleeve 1 to form a reservoir adapted to receive a liquid effusion produced by the patient's bone.
• the lower end of the prosthetic component 16, and more particularly the upper part of the post 21 forms an implant neck 7 when said prosthetic component 16 is placed on the anchoring body 1.
• the anchoring body 1 may comprise in the same manner as above an annular chamfer 25 between the upper end of the anchor body and the inlet of the frustoconical central recess 22, said frustoconical central recess 22 having in its bottom an internal thread adapted to cooperate with an external thread formed in the lower part of the frustoconical tenon of the prosthetic part 16. It will be noted that the prosthetic part then does not include indexing means and is secured to the anchoring body by screwing.
• anchoring bodies 1 as described above may have only one thread 4 and may include an implant collar of different shape without forming an annular flat adapted to receive an annular groove 9 such that previously described.
• the implant neck 7 may comprise any male or female connection means, a transfer ring, a door - Implant, a stump and the various parts of a transfer system comprising female and male connecting means adapted to cooperate with the connecting means of the implant collar 7, without departing from the scope of the invention.

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• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Orthopedic Medicine & Surgery (AREA)
• Dentistry (AREA)
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• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Prostheses (AREA)

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• 2008
  • 2008-03-28 FR FR0852044A patent/FR2929102B1/fr not_active Expired - Fee Related
• 2009
  • 2009-03-30 WO PCT/FR2009/000367 patent/WO2009130415A2/fr active Application Filing
  • 2009-03-30 EP EP09735683A patent/EP2265211A2/de not_active Withdrawn

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