FR2909540A1 - IMPLANT PROMOTING BONE MAINTENANCE AROUND THE IMPLANTAIL COLLAR. - Google Patents

Abstract

The present invention relates to an implant comprising a central body said anchor (1) of revolution adapted to be implanted in a bone of a patient, and an implant collar (7) integral with the anchoring body (1) adapted to receive a prosthetic system; said implant is remarkable in that the implant neck (7) is derived from the upper end of the anchoring body (1) and the diameter of the base of the implant neck (7) is smaller than the diameter of the generator of the upper end of the anchoring body (1) to form a flattened portion (8) between the upper end of the anchoring body (1) and the base of the implant neck (7) to provide bone support around the neck implant (7) after placement of the implant.

Description

1 Implant promoting bone retention around the implant neck.

  FIELD OF THE INVENTION The present invention relates to the field of implants and more particularly dental implants used for the establishment of one or more dental prostheses to replace one or more missing teeth in order to restore the patient, partially or totally edentulous, a chewing function and / or oral comfort and / or a better aesthetic appearance and / or better dental occlusion. BACKGROUND OF THE INVENTION 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 maxillary and / or the mandible previously pierced to receive the socket. The external thread is advantageously self-tapping in order to allow screwing in the well of the jaw provided for this purpose, said thread having a diameter just greater than the diameter of the well. 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. 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.

According to the so-called buried technique, the surgeon after opening the patient's gingiva prepares the well, commonly known as the 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 piece of healing 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 sleeve or by screwing on the connectors provided for this purpose. This surgical technique, and the implants adapted to this technique, have the disadvantage of two surgical operations and greatly reduce the time of establishment of the final dental prosthesis .. In addition, a jaw reconstruction time by graft This bone implant time may be more severe at this implant placement time, since bone grafting may be necessary if the implantation area has a bone that is too thin. To remedy this drawback, the implementation 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 could be implanted in the jaw bone with the same success as implants placed in buried technique. In the so-called non-buried technique, the surgeon sets up the implant consisting of a generally conical socket provided with a thread and at the upper end of which is located an implant neck adapted to receive the prosthetic system. The implant is placed either by opening the gingiva above the implantation area or by passing directly through the gingiva 2909540 3 according to the so-called transmucosal technique then by practicing an implanted well at the chosen depth. according to the patient's bone volume, the length of the implant being chosen by the surgeon according to the depth of said implantary well. In the case of the establishment of the implant by incision of the gum, said gingiva 5 is closed around the implant neck screwed on the upper end of the sleeve by sutures, the implant neck remaining in contact with the oral environment. 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 screwed on the sleeve and in contact with the oral medium. The surgeon then puts a so-called closure screw to close the implant neck during the phase of bone and gingival healing. After this healing phase lasting between 3 and 6 months, the closing screw is withdrawn in order to place 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 15 sealed to a stump or a prosthesis screwed to 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. Such implants are described, for example, in French patent applications FR 2 747 031, FR 2 747 032 and FR 2 709 660.

Numerous studies have shown that, in the so-called buried technique, after the prosthetic connection has been put in place, a bone resorption of about 1 mm in the first year follows due to the fact that the bone tends to recreate its own biological distance, the implant ptothesis junction in this case being done 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 prosthetic connection and the socket of the implant. In the non-buried technique, the prosthetic junction is located at a distance of approximately 1.5 mm from the bone, thus making it possible to respect the biological distance.

BRIEF DESCRIPTION OF THE INVENTION One of the aims of the invention is thus to remedy all these drawbacks by proposing a dental implant of simple and inexpensive design allowing implantation in a surgical time or in two surgical times and ensuring bone retention and therefore peri-implant soft tissue stability. For this purpose and in accordance with the invention, there is provided an implant comprising a central body said anchoring revolution adapted to be implanted in a bone of a patient, and an implantary neck secured to the anchoring body adapted to receive a remarkable prosthetic system in that the implant collar is derived from the upper end of the anchoring body and 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 portion between the upper end of the anchor body and the base 15 of the implant neck to provide bone support around the implant neck after implant placement. Said implant collar preferably has a generally conical shape, coaxial with the anchoring body, flaring from its base, that is to say from the upper end of said anchor body.

In addition, 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. In addition, said flat is inclined at an angle less than or equal to 45 relative to a plane orthogonal to the axis of revolution of the anchor body and the implant neck, and preferably at an angle of between 10 and 30. Advantageously, 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. According to a first alternative embodiment of the implant according to the invention, the anchoring body 30 consists of a generally conical sleeve and having at least one thread. Said sleeve advantageously has a rounded lower end.

Furthermore, the sleeve has a first portion called conical apical flaring from its lower end and a second so-called upper cylindrical portion extending the conical apical portion, the conical apical portion of the sleeve having a first thread and the upper portion of the sleeve having a second thread whose pitch is less than the pitch of the first thread. According to a second alternative embodiment of the implant according to the invention, the anchoring body consists of at least one disc and a stem coming from the disc and extending coaxially with said disc, the implanted collar being derived from the end upper of said rod.

Said rod comprises either a knurling or a threading. BRIEF DESCRIPTION OF THE DRAWINGS Other advantages and features will become more apparent from the following description of several variant embodiments, given by way of nonlimiting examples, of the implant according to the invention. to the invention, from the appended drawings in which: - Figure 1 is an exploded perspective view of the dental implant according to the invention - Figure 2 is a side view of the anchor body consisting of a sleeve 20 of the implant according to the invention, - Figure 3 is a detail of the side view of the socket of the implant according to the invention shown in Figure 2, - Figure 4 is a sectional view longitudinal view of the socket of the implant according to the invention shown in FIG. 2; FIG. 5 is a view from above of the socket of the implant according to the invention shown in FIG. 2; FIG. a perspective view of an alternative embodiment of the Anchoring body of the implant according to the invention, - Figure 7 is a side view of the embodiment of the anchor body of the implant according to the invention shown in Figure 6, 2909540 6 FIG. 8 is a side view of the cover screw of the implant according to the invention shown in FIG. 1; FIG. 9 is a longitudinal sectional view of the cover screw shown in FIGS. 8, 5 - Figure 10 is a longitudinal sectional view of the implant implant holder according to the invention, - Figure 11 is a side view of the implant implant holder according to the invention, - Figure 12 is a longitudinal sectional view of the abutment of the implant according to the invention, FIG. 13 is a side view of the abutment of the implant according to the invention, FIG. 14 is a sectional view. longitudinal view of the long cover screw shown in FIG. 1 of the implant according to the invention, FIG. a side view of the transfer ring of the implant according to the invention, - Figure 16 is a radial sectional view of the transfer ring shown in Figure 15, Figure 17 is a top view of the Transfer ring shown in Figures 15 and 16; Figure 18 is a perspective view of the first transfer part of the implant transfer system according to the invention; FIG. 19 is a longitudinal sectional view of the transfer part of the implant according to the invention shown in FIG. 18; FIG. 20 is a longitudinal sectional view of the calcinable sheath of the implant according to FIG. FIG. 21 is a side view of the calcinable sheath of the implant according to the invention, FIG. 22 is an alternative embodiment side view of the socket of the implant according to the invention. FIG. 23 is a longitudinal sectional view of the socket of the implant according to the invention shown in FIG. 23. DETAILED DESCRIPTION OF THE INVENTION In this particular example, a dental implant intended for be used for the placement of one or more dental prostheses to replace one or more missing teeth; 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. Referring to Figures 1 to 4, 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 cylindrical basal upper portion 3 extending the conical apical portion 2. 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, preferably asymmetric and self-tapping, and the upper portion 3 of said sleeve 1 has a second thread 5 whose pitch is smaller than the pitch of the first thread 4. The apical portion 2 and the upper portion 3 of the sleeve 1 have a rough and / or porous surface to allow activation of the osseointegration after implantation. Advantageously, the sleeve 1 has a slightly rounded lower end for use in surgical techniques of raising the sinus floor well known to the skilled person. Furthermore, the implant comprises an implant neck 7 extending from the upper end of the sleeve 1, the sleeve 1 and the implant collar being obtained in one piece. This implant neck 7 comes from the upper end of the sleeve 1 and 2909540 8 has a generally conical shape, coaxial with said sleeve 1, flaring from its base, that is to say from the upper end of According to an essential characteristic of the invention, 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 in order to form an annular flattening 8 between the end. upper portion of said sleeve 1 and the base of the implant neck 7. This annular flat 8 preferably has a rough and / or porous surface to allow activation of the osseointegration and is inclined from the base of the implant neck 7 to the upper generatrix of the sleeve 1 towards the lower end of said sleeve 1 10 at an angle with respect to a plane orthogonal to the axis of revolution of the sleeve and the implant collar 7. Dan In this particular embodiment, the angle a is less than 450 and is approximately equal to 10 for example. The flat may have a smooth surface or have surface irregularities such as, for example, waves or successions of streaks or the like. It will be observed that this inclined annular flat 8 represents for the peri-implant bone a bone growth ramp after implantation of said socket 1. This annular flat 8 allows preservation of the bone in the peri-implant region and therefore makes it possible to maintain the peri-implant soft tissues 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. The implant neck 7 has a first portion 9 whose outer wall 25 flares from its base by having an outwardly oriented concavity and a second portion 10 whose outer wall flares out with an outwardly facing convexity . The outer wall of the implant neck has a generally smooth machined surface. In addition, in this particular embodiment, 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.

However, it is obvious that 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 5 is constant regardless of the diameter of the sleeve, without departing from the scope of the invention. The implant neck 7 comprises a frustoconical central recess 11 opening on a hexagonal recess 12 located at the base of said implant neck 7, said hexagonal recess 12 opening on the central thread 13 of the sleeve 1.

According to an alternative embodiment of the anchoring body 1 of the implant according to the invention, with reference to FIGS. 6 and 7, said anchoring body 1 consists of a disk 14 forming the lower part of the body of the body. 1 anchoring and a cylindrical rod 15 from the disk 14 and extending coaxially with said disk 14, the implant collar being derived from the upper end of said rod 15. The implantation of this implant 15 is carried out by lateral and not by the axial way and requires the use of a jaw bone cutting tool adapted to the shape of the implant. It will be observed that the disc 14 may consist of a flat piece of any shape such as a semicircular or circular flat piece for example without departing from the scope of the invention.

In the same manner as before, the implant comprises an implant neck 7 extending from the upper end of the shaft 15, the disk 14, the shaft 15 and the implant collar 7 being obtained in one piece. This implant neck 7 comes from the upper end of the rod 15 and has a generally conical shape, coaxial with said rod 15 and disk 14, flaring from its base, that is to say from the end upper of said rod 15. 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 15 to form an annular flat 8 between the upper end of said rod 15 and the base This annular flat 8 is inclined from the base of the implant neck 7 towards the upper generatrix of the rod 15 towards the disc 14 at an angle α with respect to a plane orthogonal to the axis of revolution of the implant. In this particular embodiment, the angle α is less than 45 and is approximately equal to 30 for example. Furthermore, the implant neck 7 comprises a first portion 9 whose outer wall flares from its base by having an outwardly oriented concavity 5 and a second portion 10 whose outer wall flares out with a convexity oriented towards outside. Note that the hexagonal recess 12 of the implant neck 7 may be 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 rotation. 10 revolution. In this way, 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 rod 15 advantageously comprises a thread or knurling 16 of not very fine to ensure better primary stabilization of the implant. With reference to FIGS. 1, 8 and 9, the implant according to the invention comprises a so-called cover screw 17 comprising a cylindrical body 18 and a frustoconical base 19 capable of being inserted into the frustoconical recess 11 of the implant neck 7 and terminated by a coaxial threaded rod 20 so that the cylindrical body 18 bears against the distal edge of said implant neck 7 when the cover screw 17 is screwed into the tapping 13 of the anchoring body 1. The upper edge 21 of the cylindrical body 18 is chamfered so that it does not present a sharp stop. The outer diameter of the cylindrical body 18 is just equal to the outer diameter of the upper edge of the implant neck 7. Said cover screw 17 has at its upper end a hexagonal central recess 22 in which a hexagonal screwdriver or the like can be inserted. , not shown in the figures, for screwing. According to an alternative embodiment, particularly for the so-called buried technique, the cylindrical body 18 of the cover screw 17 may be substituted by a flat head to form a so-called flat cover screw.

It is obvious that the hexagonal recess 22 may be substituted by any other equivalent means, such as radial slots for example, allowing the screwing with a tool of corresponding shape. It will be observed that this cover screw 17 is screwed onto the anchoring body 1 5 of the implant to close the implant neck 7 for implant placement in two surgical times, according to the so-called non-buried technique. With reference to FIGS. 1, 10 and 11, the implant according to the invention comprises an implant holder 23 comprising a base 24 constituted by a truncated cone 25 terminated by a hexagon 26 capable of being inserted into the frustoconical recess 11 and respectively in the hexagonal recess 12 of the implant neck 7 of the anchor body. The upper end of the implant holder 23 consists of a hexagonal body 27 and male connection means 28 adapted to cooperate with corresponding female connection means of a laying tool, not shown in the figures. With reference to FIGS. 1, 12 and 13, the implant according to the invention comprises a false abutment 29 consisting of a cylindrical body 30 of external diameter just equal to the external diameter of the upper edge of the implant neck 7, of a base 31 having a frustoconical first portion and a hexagonal lower portion adapted to be respectively inserted in the frustoconical recess 11 and in the hexagonal recess 12 of the implant neck 7 and a conical head 32 narrowing from the cylindrical body 30 to 'at its upper end. The conical head 32 of the abutment 29 comprises a series of indentations 33 extending alternately from the cylindrical body 30 to the upper end of the conical head 32 and from the medial portion of the conical head 32 to the upper end of the latter. The abutment 29 further includes a central through thread 34 adapted to receive a long screw 35 shown in FIGS. 1 and 14. Said long screw 35 consists of a threaded rod 36 and a cylindrical head 37 provided with a hexagonal recess 38 adapted to receive a hexagonal screwdriver said hex screwdriver, not shown in the figures. The threaded rod 36 of this long screw 35 is able to cooperate with the tapping 13 of the anchoring body 1.

In a particularly advantageous manner, the implant according to the invention, with reference to FIG. 1, comprises a so-called transfer system 39 consisting of a transfer ring 40, a first transfer part 41, a a second transfer part 42 and a burnout sheath 43. With reference to FIGS. 1, 15, 16 and 17, the transfer ring 40 comprises a first part 44 able to cooperate with the implant neck 7 of the anchoring body 1 and a second portion 45 of hexagonal shape called hexagonal head, said first and second portion 44,45 being separated by an annular flange 46 adapted to bear on the upper edge of the implant neck 7. Said first portion 44 consists of a truncated cone 47 adapted to fit into the frustoconical recess 11 of the implant neck 7 and terminated by a hexagonal element 48 which is inserted into the hexagonal recess 12 of said implant collar 7. The annular collar 46 has an outer diameter just equal to the outer diameter of the upper edge of the implant neck 7. Furthermore, the transfer ring 14 has a central bore through 49 to allow the passage of a screw as will be detailed below. This transfer ring 40 makes it possible to maintain or control the tissue thickness of the soft tissues which have a variable height from one patient to another. With reference to FIGS. 1, 18 and 19, the implant according to the invention comprises a first generally cylindrical transfer part 41 comprising a central tapping 50, and a hexagonal recess 51 at one of its ends, said hexagonal recess 51 being adapted to cooperate with the hexagonal head 16 of the transfer ring 40 shown in FIGS. 1, 15, 16 and 17. Said first transfer part 41 furthermore comprises two annular grooves 52 extending on the outer wall of FIG. said first transfer part 41 in its median part, and two diametrically opposed plates 53 extending generally from one end to the other of said transfer part 41.

This first transfer part 41 is able to be positioned on the transfer ring 40 which is put in place on the implant neck 7 of the implant, the first transfer part 41 and the transfer ring 40 being held in place by the long screw 35 previously described and shown in Figure 1. The threaded rod 36 of the long screw 35 is adapted to cooperate with the tapping 13 of the anchoring body 1 30 to maintain the first transfer part 41 and the transfer ring 40 in place to perform, for example, an impression of the positioning of the implant 2909540 13 in the maxillary or the mandible according to the pick-up or pop-up technique well known to those skilled in the art. Referring to Figure 1, the transfer system 39 according to the invention comprises a second transfer part 42 particularly intended to receive a temporary prosthesis. This second transfer member 42 has a generally conical shape narrowing from its lower end to its upper end. Said second transfer part 42 comprises a helical groove 58 extending generally from the lower end to the upper end of said second transfer part 42. This second transfer part 10 comprises a central through hole able to receive a so-called short screw 54, shown in Figure 1, for holding the second transfer member 42 and the transfer ring 40, the second transfer member 42 fitting on the upper end of the transfer ring 40. This short screw 54 consists of a threaded rod 55 at its lower end and a cylindrical head 56 provided with a hexagonal recess 57 adapted to receive a hexagonal screwdriver said hex screwdriver, not shown in the figures. Finally, with reference to FIGS. 1, 20 and 21, the implant according to the invention comprises a so-called calcinable sheath 43 that is generally cylindrical, one end of which has a lower annular flange 60 able to bear on the upper edge of the neck. 7. Said burnout sheath 43comporte a through central tapping 61 adapted to receive either the short screw 54 consists of a threaded rod 55 and a cylindrical head 56 provided with a hexagonal recess 57 as described above and shown in Figure 1, the long screw 35 consisting of a threaded rod 36 and a cylindrical head 37 provided with a hexagonal recess 38 25 described above. This burnout sheath 43 is particularly suitable for producing a cast prosthesis or a poured cast abutment with immediate loading, which makes it possible to control the soft tissues. It goes without saying that the transfer system 39 of the implant according to the invention can be adapted to all implant types currently marketed without departing from the scope of the invention.

According to an alternative embodiment of the implant according to the invention, with reference to FIGS. 22 and 23, the latter is constituted in the same manner as previously of an anchoring body 1 in the form of a sleeve and of an implant neck 7 extending from the upper end of the sleeve 1, the sleeve 1 and the implant collar being obtained in one piece. This implant neck 7 comes from the upper end of the sleeve 1 and has a generally conical shape, coaxial with said sleeve 1, flaring from its base, that is to say from the upper end of said socket 1. The implant collar 7 differs from that of the alternative embodiments shown in FIGS. 1 to 7, in that the frustoconical recess 11 and the hexagonal recess 10 12 are substituted by a hexagonal head 62 projecting from the upper edge. said implant neck 7, an annular groove 63 separating the upper edge of the implant neck 7 of the hexagonal head 62. The hexagonal head 62 comprises a central thread 64 opening on the tapping 13 of the sleeve 1. According to another embodiment, the heaxagonal head 62 may be located either at the upper edge of the implant neck 7 or below it. It goes without saying that the different parts of the transfer system 39 of the implant according to the invention can easily be adapted to this particular form of implant implant neck 7 by the skilled person. Finally, it goes without saying that the examples which have just been given are only particular illustrations of the invention and that the implant neck 7 may comprise any male or female connection means, the transfer ring, the implant holder, the abutment and the various parts of the transfer system comprising female and male connecting means adapted to cooperate with the connecting means of the implant neck 7, without departing from the scope of the invention.

Claims (13)

  1 - Implant comprising a central body said anchor (1) of revolution adapted to be implanted in a bone of a patient, and an implant collar (7) integral with the anchoring body (1) adapted to receive a prosthetic system characterized in that the implant neck (7) is from the upper end of the anchoring body (1) and the diameter of the base of the implant neck (7) is smaller than the diameter of the generatrix of the upper end of the anchoring body (1) to form a flat (8) between the upper end of the anchoring body (1) and the base of the implant collar (7) to provide bone support around the implant neck (7). ) after implant placement.   2 - Implant according to claim 1 characterized in that the implant neck (7) has a generally conical shape, coaxial with the anchoring body (1), flaring from its base, that is to say from the upper end of said anchor body (1).   3 - Implant according to any one of claims 1 or 2 characterized in that the flat (7) is inclined from the base of the implant neck (7) to the upper generatrix of the anchor body (1) in the direction of the lower end of said anchor body (1).   4 - Implant according to claim 3 characterized in that the flat (7) is inclined at an angle α less than or equal to 30 relative to a plane orthogonal to the axis of revolution of the anchoring body (1) and the neck implant (7).   5 - Implant according to claim 4 characterized in that the flat (8) is inclined at an angle between 2 and 3.   6 - Implant according to any one of claims 2 to 5 characterized in that the implant neck (7) comprises a first portion (9), the outer wall flares from its base having a concavity and a second portion (10). ) flaring out with convexity.   7 - Implant according to any one of claims 1 to 6 characterized in that the anchoring body (1) consists of a generally conical sleeve and having at least one thread (4,5). 2909540 16   8 - Implant according to claim 7 characterized in that the sleeve (1) has a rounded lower end.   9 - Implant according to any one of claims 7 or 8 characterized in that the sleeve (1) has a first portion called apical (2) conical 5 flaring from its lower end and a second portion said upper (3) cylindrical extending the conical apical portion (2).   10 - Implant according to claim 9 characterized in that the conical apical portion (2) of the sleeve (1) has a first thread (4) and in that the upper portion (3) of the sleeve (1) has a second thread (5) whose pitch is less than the pitch of the first thread (4).   11 - Implant according to any one of claims 1 to 6 characterized in that the anchoring body (1) consists of at least one disc (14) and a rod (15) from the disc (14) and extending coaxially with said disc (14), the implant neck (7) being derived from the upper end of said rod (14). 15   12 - Implant according to claim 11 characterized in that the rod (15) comprises a knurling (16).   13 - Implant according to claim 11 characterized in that the rod (15) has a thread (16).