Assembly interface between the superstructure and the implant body

Abstract

The present invention relates to an assembly interface using a threaded bolt between a superstructure support supporting a superstructure part and an implant body having an internal thread, the superstructure support and the implant body being arranged in a rotationally locked manner relative to one another. In this case, an internal thread is arranged in the inner cavity of the superstructure support in the area facing the implant body. The threaded bolt has two external threads arranged one after the other with or without a gap between them, the first of which is an external driving thread and the second is an external locking thread. The two external threads have different pitches. The present invention improves the assembly interface between the superstructure support and the implant body in such a way that a reliable support of the superstructure is guaranteed with simple pre-assembly and final assembly.

Description

[Technical field]

[0001] The invention relates to an assembly interface between a superstructure support supporting a superstructure and an implant body having an internal thread by means of a threaded bolt, in which the superstructure support and the implant body have a complementary connection geometry at least in certain areas in order to ensure a relative immobility of the assembly interface, where the superstructure support has an inner cavity that is open towards the superstructure and towards the implant body.

[0002] In implant dentistry, especially within the scope of the production of single prosthetic dentures, enossal implant bodies are often used to support the prosthesis. In this case, a screw-plug type implant body is screwed into an artificially created hole in the patient's jaw. In the completed prosthesis, the screwed implant body receives an implant post. The implant post is fixed in the implant body in a rotationally immovable manner using special fastening means. A superstructure forming a visible crown is then fitted directly or indirectly onto the implant post, for example by gluing.

[0003] From German Utility Model No. 202012102746 a tooth implant construction system is known, in which the implant body, the superstructure support, the adhesive body and the artificial crown form an artificial denture.

[0004] The problem underlying the present invention is to improve the assembly interface between the superstructure support and the implant body in such a way that a reliable support of the superstructure is guaranteed with simple pre-assembly and final assembly.

[0005] This problem is solved by the features of claim 1. In this case, an internal thread is arranged in the inner cavity of the superstructure support in the area facing the implant body. The threaded bolt has two external threads arranged one behind the other with or without a gap, the first of which is a driving external thread and the second of which is a locking external thread. The two external threads have different pitches. The driving external thread engages with the driving internal thread of the inner cavity of the superstructure support and the locking external thread engages with the locking internal thread of the implant body.

[0006] According to the invention, an assembly interface is provided, which connects the superstructure support to the implant body by means of a double screw transmission, for which the superstructure support and the implant body each have their own internal threads, which mesh with two different external threads of one threaded bolt.

[0007] In a pre-assembly step, the threaded bolt is screwed or through-threaded into the internal thread of the lower end of the superstructure support in a loss-proof manner. For connection to the implant body, the superstructure support is mounted with this threaded bolt in the implant body. In this case, the free end of the threaded bolt reaches in front of the internal thread of the implant body. By means of a tool which passes through the inner space of the superstructure support and is coupled into the tool receptacle of the threaded bolt, the threaded bolt is subjected to a rotational movement, so that on the one hand the front threaded bolt threads into the implant body thread and on the other hand the superstructure support and the implant body are moved translationally towards each other. The threaded bolt thus provides a permanent fastening of the superstructure support and the implant body to each other.

[0008] The threads connecting the three parts involved in the assembly interface to one another are formed as single-start and / or multiple-start threads. For turning the threaded bolt into or out of the implant body, the radially outer contour of the threaded bolt does not have a tool-engaging surface.

[0009] There is no such restriction on the radial profile of the axial bore or of any other configuration of axial bore.

[0010] This screw bolt, which does not have a screw head as opposed to a normal screw, does not have to be installed through an opening in the superstructure into the bore of the superstructure closest to the superstructure part, which bore can therefore have a smaller cross section along its entire length than the cross section of a normal screw head, and the use of this assembly interface therefore increases the geometrical strength of the superstructure support without changing its construction size.

[0011] Further details of the invention are evident from the dependent claims and the following description of schematically illustrated embodiments. [Brief description of the drawings]

[0012] [Figure 1] FIG. [Diagram 2] FIG. 1 is a longitudinal section through a prosthetic tooth without showing the crowns. [Diagram 3] FIG. [Figure 4] FIG. 1 is a longitudinal sectional view of the upper structure support with a threaded bolt inserted therein; [Diagram 5] 5 is a view similar to FIG. 4, but showing the state after the threaded bolt has been screwed in. FIG. [Figure 6] FIG. 2 is a side view of a short threaded bolt. [Figure 7] FIG. 13 is a longitudinal cross-sectional view of the upper structure support and the implant body, showing the threaded bolt loosely inserted. [Figure 8] FIG. 8 is a view similar to FIG. 7 after the upper structure support has been fixed. [Figure 9] FIG. 1 is a perspective view of a threaded bolt with multiple reverse external threads. [Figure 10] FIG. 13 is a longitudinal cross-sectional view of the superstructure support with threaded bolts shown installed in the implant body. [Figure 11] FIG. 11 is a view similar to FIG. 10, but showing the upper structure support in a state after fixing. [Figure 12] FIG. 1 shows a schematic diagram of a double screw transmission with two right-hand threads in a half cross-sectional view before the screw-in of the substitute thread bolt. [Figure 13] 13 is a view similar to FIG. 12, showing the substitute threaded bolt in a state where it has been screwed in one turn. [Figure 14] 14 is a view similar to FIG. 13, showing the substitute threaded bolt being further threaded in one turn. [Figure 15] 15 is a view similar to FIG. 14, showing the substitute threaded bolt screwed in one final turn. [Figure 16] FIG. 2 is a schematic diagram of a double screw transmission with left-hand and right-hand threads, partially in cross section in half, before the screwing in of the substitute thread bolt. [Figure 17] 17 is a view similar to FIG. 16, showing the substitute threaded bolt in a state where it has been screwed in one turn. [Figure 18] 18 is a view similar to FIG. 17, showing the substitute threaded bolt being screwed in one further turn. [Figure 19] 19 is a view similar to FIG. 18, showing the substitute threaded bolt screwed in one final turn.

[0013] 1 illustrates all the parts of the artificial tooth (1) in an exploded view. A hollow threaded implant body (10) is used as a basis, to which a superstructure support (20) is non-rotatably positioned and screwed by means of a special threaded bolt (60), for example in combination with an adhesive body (100) applied thereon.

[0014] For this purpose, a bent superstructure support 20, for example, is mounted in a conical seat 14 in the implant body 10. The superstructure support 20 is held in the inner cavity 13 of the implant body 10 by means of a threaded bolt 60. A further superstructure part, usually an artificial dental crown 120, is placed on and glued onto the adhesive body 100.

[0015] The basis of the prosthetic tooth (1) is an implant body (10) that can be screwed into the jawbone. The implant body is optionally a self-tapping hollow screw, for example with a non-metric external thread. Approximately in the upper half, the implant body (10) has a multi-stage bore (13), which is divided into three sections (see FIG. 2). The first section (14) is located in the region of the implant shoulder (12) of the implant body (10) and is an internal cone, for example with an apex angle of 18°. The internal cone section (14) merges into an internal hexagon (15) in the second section, which is used as a locking mechanism. Instead of the internal hexagon (15), for example a double internal hexagon or another positively or frictionally locking locking mechanism can also be used as a connecting geometry. The third section (17) is a threaded hole with an internal fastening thread (82) which, during assembly, receives the threaded bolt (60) which holds the superstructure support (20). The upward-right fastening internal fastening thread (82) is, for example, an M1.6×0.35 thread according to DIN 13, Blatt 1.

[0016] The superstructure support 20 is primarily used as a base for the artificial dental crown 120 when mounted in the implant body 10. The superstructure support has an area facing the implant body 10 and an area facing the dental crown 120 or the superstructure.

[0017] The area facing the implant body 10 is an implant neck 42 having an outer cone 43 and an outer hexagonal section 44. The outer cone 43 and the outer hexagonal section 44 are seated precisely in the inner cavity 13 of the implant body 10. In the axial direction pointing towards the tip of the implant body 10, the end face of the outer hexagonal section 44 does not come into contact with the inner cavity 13.

[0018] Above the implant neck (42) there is, for example, an implant dish (31), which projects outwardly from the implant neck (42), for example by means of a continuous transition. The implant dish (31), which is, for example, not round, has, at least in certain regions or in certain sections, the shape of the peripheral surface of a truncated cone whose apex angle opens towards the crown (120). The apex angle is, for example, between 125° and 131°. Optionally, the underside of the implant dish (31) may consist of a number of mutually projecting conical sections, each of which forms a different angle with respect to the center line (29). In this case, the apex angle of the cone is between 120° and 136°.

[0019] The outer edge (33) of the implant dish (31) has a distance relative to the center line (29) that varies regionally, for example between 2.22 and 3.48 mm when rotated 360° about the center line (29). The outer edge (33) has a height deviation in the longitudinal direction of the center line (29) of, for example, 0.8±0.2 mm in this case.

[0020] Above the implant dish (31) extends the implant post (23). The implant post has a smaller cross-section, for example in the rounded transition region to the implant dish (31), than the maximum cross-section of the implant dish (31). The implant dish (31) therefore also has an upper surface edge (37) towards the implant post (23). In almost all cross-sections lying through the center line (29), the contour of the upper surface edge is oriented perpendicular to the center line (29) at least in certain regions. At its narrowest point, the implant dish (31) protrudes in the radial direction, for example by 0.4 to 0.5 mm. When measured at its widest point, it may exceed 2 mm, for example. The upper surface edge (37) forms, inter alia, a seating surface for the adhesive body (100) or the dental crown (120).

[0021] The rounded transition area may be recessed axially parallel to the centerline (29) by 0.05-0.2 mm, resulting in a groove (35) between the planar edge upper surface (37) and the implant post (23). According to the cross-sectional view shown in Figure 2, the implant post (23) tapers upwardly.

[0022] According to FIG. 1, the implant post (23) consists, in a first approximation, of the superposition of an oblique truncated cone with a circular base cross-section and an oblique truncated cone with an elliptical cross-section, which penetrates the base cross-section in a certain area. The center lines of the two truncated cones form a plane in which the semi-minor axis of the elliptical cross-section lies. In the area penetrated by the two oblique truncated cones, there is a rounded section, the radius of which is, for example, 0.3-0.4 mm. This special shape of the implant post (23) forms a rotation-proof base for the adhesive body (100) to be supported.

[0023] Optionally, the superstructure support (20) is provided with a titanium coating at least above the implant dish (31), the layer thickness of which is, for example, 1-4 μm. Alternatively, a thin ceramic or copolymer coating may be applied thereto.

[0024] According to Fig. 1, the upper structure support (20) has a continuous hollow (51) which in the central region has a bending point with a bending angle of, for example, 11 ± 4°. The finished hollow (51) consists of four sections.

[0025] The first section (52) and the second section (53) serve to introduce the threaded bolt (60). The first lower section (52) is a cylindrical hole, the diameter of which is, for example, 2.1 mm at a depth of about 1.9 mm. The center line (49) of this hole coincides with the center line (29). This section is followed by an internal thread (72), for example a right-hand thread, which is described as M2 x 0.25 according to DIN 13, Blatt 2, as this fine thread has a length of, for example, 2 mm in this case. The transition between the internal thread (72) and the hole (52) forms a flat abutment collar (54).

[0026] The fourth upper section (57) is also a cylindrical hole. The center line (59) of this hole intersects with the center line (29) in the third section (56) at an angle of, for example, 11°. The upper section (57) is used to introduce a tool for tightening the threaded bolt (60). The third section (56) is a transitional region, for example with a hemisphere on the periphery (see FIG. 2).

[0027] The threaded bolt (60-62) is typically divided into five regions, adjacent to one another from front to rear: a pivot region (63), a drive region (70), an intermediate region (75), a clamping region (80), and a gripping region (85) (see Figures 3, 6, and 9).

[0028] The pivot area (63) is a cylindrical pin (64) in which a tool receiving portion (65) is formed. This pin has a diameter of, for example, 1.66 mm and a length of, for example, 1.5 mm. The central tool receiving portion (65) is, according to figures 3, 6 and 9, an inner hexagon (66) with a width across flats of, for example, 1.13 mm, the depth of this inner hexagon accessible by the tool being, for example, 1.05 mm. Instead of the inner hexagon, a hexagonal star hole, a triple square thread hole, a cross recess, a slit, etc. can also be provided. Another driving aspect is an outer hexagonal star or an outer hexagon. In some cases, the hexagonal star or the hexagonal shape is cylindrically rounded in the axial direction.

[0029] In the threaded bolts (60-62) of Figures 3, 6 and 9, the tool receiving portion (65) may be formed in the drive region (70) with the pin (64) shortened or removed, thereby allowing the threaded bolts (60-62) to be shortened by, for example, 1.5 mm or more.

[0030] The drive region (70) has, according to Figures 3 and 6, a fine thread of the type M2x0.25, the available length of which is, for example, 1.73 mm. Other fine threads as drive threads (71, 72) are also conceivable, for example M1.8x0.25, M1.8x0.2, M1.6x0.25 or M1.6x0.2. For these threads, the outer diameter of the drive region (70) can be adapted accordingly.

[0031] The drive region (70) is followed by an intermediate region (75) which serves as a spacer for the following clamping region (80). According to FIG. 2, the intermediate region (75) is composed of a cylindrical pin (76) and a stop flange (78). The cylindrical pin (76) has, for example, the same outer diameter as the pivot region (63). In some cases, the outer diameter of the cylindrical pin (76) corresponds to the root diameter of the drive male thread (71). The length of the intermediate region (75) is, for example, 1.03 mm.

[0032] A plate-shaped stop flange 78 is adjacent to the cylindrical pin 76 towards the clamping area 80. The stop flange 78 has an outside diameter of, for example, 2.08 mm and a thickness of, for example, 0.46 mm.

[0033] An external tension thread (81) defines the tension region (80). In this case, the external tension thread is a coarse thread M1.6×0.35 according to DIN 13, Blatt 1, with a length of 1.46 mm.

[0034] The gripping area (85) adjacent to the fastening area (80) has, on the one hand, a geometric shape that allows the threaded bolt (60-62) to be gripped by a handheld tool and introduced for screwing into the fourth section (57) of the inner cavity (51) of the superstructure support (20-22) (see FIG. 4), and, on the other hand, the gripping area (85) facilitates the introduction of the superstructure support (20-22) (see FIG. 5) with the threaded threaded bolt (60) into the stepped hole of the implant body (10).

[0035] In this case, the gripping area (85) is, for example, an external hexagonal part tapering towards the free end of the threaded bolt (60). The two opposing sides of the external hexagonal part of the gripping means form an angle of, for example, 5°. The maximum outer diameter is smaller than the root diameter of the external tensioning thread (81). According to FIG. 3, the external hexagonal part has a width across 0.95 mm.

[0036] Of course, the gripping area (85) may also be formed as a shorter cylindrical pin or as a cone. If a cone is used, the cone tapers towards its free end. Preferably, the pin or cone has a maximum diameter equal to or smaller than the minor diameter of the tightening male thread. In some cases, the gripping area (85) may be omitted. In this case, the threaded bolt (60) is gripped by a handheld tool at the tightening male thread (81) for installation and for screwing into the superstructure support (20).

[0037] The gripping area (85) can also be integrated into the clamping area (80) completely or in a specific area in the form of a hole or cavity, in which case a handheld tool with a miniature clamping spindle engages in the corresponding hole or cavity.

[0038] In FIG. 4, the upper structure support 20 is shown with the threaded bolt 60 mounted in the lower bore 53. In this case, the pivot area 63 of the threaded bolt 60 reaches into the area of ​​the female drive thread 72. If the threaded bolt 60 is inserted further into the lower bore 52, the male drive thread 71 reaches in front of the female drive thread 72 of the upper structure support 20. From here, the threaded bolt 60 is screwed into the female drive thread 72 until the stop flange 78 of the threaded bolt 60 abuts against the stop collar 54 (see FIG. 5). The threaded bolt 60 is now mounted in a position behind the upper structure support 20 in a loss-proof manner. In this form, the combination of the upper structure support 20 and the threaded bolt 60 can be sold.

[0039] The process of mounting and screwing the superstructure support (20) into the implant body (10) is explained below on the basis of the schematic drawings in Figures 12 to 15. A double screw transmission with two right-hand threads is shown in four positions in half of the cross-sectional view. Each of Figures 12 to 15 shows a substitute threaded bolt (260), a lifting nut (220) as a substitute for the superstructure support, and a fixing nut (210) as a substitute for the implant body.

[0040] The substitute threaded bolt (260) has, to a first approximation, all the features of a threaded bolt according to DIN 2509. For example, one threaded section is located on each side of a smooth shaft (275). The front threaded section is in this case the tension thread (81), and the rear threaded section is the drive thread (71). The substitute threaded bolt has a tool receptacle in the form of a slot (267) on the drive thread (71) so that the substitute threaded bolt (260) can be turned, for example, by means of a slotted screw driver.

[0041] The locking thread (81) and the driving thread (71) each have four threads in this embodiment. One thread corresponds to one screw tooth over 360°. The locking thread (81) has a pitch of 7LE, while the driving thread (71) has a thread pitch of only 5LE.

[0042] The lift nut (220) and the locking nut (210) each have four threads. The thread pitch of the lift nut (220) corresponds to the thread pitch of the drive thread (71). The thread pitch of the locking nut (210) corresponds in this case to the thread pitch of the tension thread (81).

[0043] The fixing nut 210 has a fixing nut stopper 212 on its upper end surface. The anti-rotation web 215 protrudes beyond the fixing nut stopper 212.

[0044] The lifting nut (220) has a lifting nut stopper (222) on its lower end surface, which faces the fixed nut stopper (212). An anti-rotation groove (225) is arranged on the outer wall of the lifting nut. An anti-rotation web (215) of the fixed nut (210) protrudes into the anti-rotation groove. The anti-rotation web (215) corresponds to the inner hexagonal portion (15) of the implant body (10). The anti-rotation groove (225) corresponds to the outer hexagonal portion (44) of the upper structure support (20).

[0045] In Fig. 12, the assembly consisting of the lift nut (220) and the substitute thread bolt (260) is shown immediately after insertion into the fixing nut (210). The anti-rotation groove (225) of the lift nut (220) surrounds the anti-rotation web (215) of the fixing nut (210). The forwardmost flank of the front thread of the external tension thread (81) abuts against the rear flank of the internal tension thread (82). The lift nut stop (222) has a maximum distance of 6LE from the fixing nut stop (212) after contact formation.

[0046] Now, the substitute threaded bolt (260) is screwed into the fixed nut (210) by rotating 360° to the right (see FIG. 13). The substitute threaded bolt (260) makes a stroke of 7LE in this case. By rotating the substitute threaded bolt (260) to the right by 360°, the substitute threaded bolt is necessarily twisted out of the lift nut (220) by one rotation. The substitute threaded bolt (260) in this case leaves 5LE in the lift nut (220). Furthermore, the lift nut (220) moves 2LE towards the fixed nut (210) in the tightening stroke, and in this case the distance between the lift nut stopper (222) and the fixed nut stopper (212) is reduced by 2LE to 4LE. The tightening stroke "H" is given by the following formula in this embodiment: H = U × (p S -p A )

[0047] In this case, "U" is the number of rotations of the substitute screw bolt (260) and "p S " is the pitch of the tension screw threads (81, 82), and "p A " is the pitch of the drive threads (71, 72).

[0048] When the substitute threaded bolt (260) is screwed in deeply by one turn, it will be in the state shown in the cross section of Figure 14. The gap between the lift nut stopper (222) and the fixed nut stopper (212) is reduced to 2LE.

[0049] After further rotation of the substitute threaded bolt (260), the lifting nut stopper (222) abuts against the fixed nut stopper (212) (see FIG. 15). The threading movement of the substitute threaded bolt (260) is terminated.

[0050] The number of threads per thread pair (73, 83) is chosen merely as an example in the illustrated principle diagram for functional clarity: when the lifting nut is screwed in tightly, both thread pairs (73, 83) carry the same tightening load, so that the number of threads supported per thread pair changes only slightly.

[0051] According to Fig. 2, the screwing process is completed after the implant cone (43) is fixedly mounted in the inner cone (14) of the implant body (10). All four threads of the locking internal thread (81) are seated in the locking internal thread (82). Similarly, six threads of the driving external thread (71) are located in the driving internal thread (72).

[0052] In Fig. 6, a short threaded bolt (61) without a stop flange is shown. The driving thread (71) and the tension thread (81) of this threaded bolt correspond to the driving thread and the tension thread of the threaded bolt (60) of Fig. 3. Between the two threads (71, 81) there is a short frustoconical pin (77), for example 0.45 mm, tapered towards the tension thread (81) as an intermediate region (75). The apex angle of this frustoconical pin is, for example, 60°.

[0053] The upper structure support (21) (see FIGS. 7 and 8) that fits this threaded bolt (61) has an inner cavity (51) that is shaped differently from the inner cavity of the upper structure support (20) in FIG.

[0054] The first lower section (52) is a driving internal thread (72), for example M2 x 0.25, right-hand thread according to DIN 13, Blatt 2. This fine thread has a length of, for example, 1.33 mm in this case. Its root diameter is, for example, 1.76 mm. The driving internal thread (72) is followed as the second section (53) by a cylindrical rear engagement bore (58), the diameter of which is, for example, 2.02 mm at a depth of approximately 1.25 mm. The bore (58) merges into a stop section in the form of a narrow section (55), which has a radius of 0.5 mm and which, viewed in longitudinal section, widens in the direction of the rear engagement bore (58). The narrow section (55) has an internal diameter of, for example, 1.62 mm, so that the cylindrical pin (64) of the threaded bolt (61) fits in with little play. Above the narrow area (55), the hole expands into a funnel shape with an opening angle of at least 10°. The centerlines of the driving female thread (72), the rear engagement hole (58), and the narrow area (55) are coincident with the centerline (29).

[0055] As shown in Fig. 7, before the upper structure support 21 is fixed to the implant body 10, the threaded bolt 61 is screwed into the upper structure support 21 from below until the male driving thread 71 of the threaded bolt leaves the female driving thread 72 again and reaches the rear engagement hole 58. The male driving thread 71 of the threaded bolt 61 is attached to the rear engagement hole 58 with some play so that it will not get lost and can rotate freely.

[0056] When the upper structure support (21) is installed in the implant body (10) together with the threaded bolt (61), the forward most thread of the locking male thread (81) abuts the first thread of the locking female thread (82) (see FIG. 7).

[0057] 8 shows the assembly interface after the superstructure support (21) has been fixed to the implant body (10). The two external threads (71, 81) have engaged in their respective corresponding internal threads (72, 82) almost simultaneously during the screwing process. The cylindrical pin (64) of the threaded bolt (61) closes the narrow passage (55) with a small amount of play, so that cement and adhesives cannot reach the area of ​​the drive threads (71, 72) during further finishing of the individual artificial teeth of the prosthesis.

[0058] In figures 9 to 11 an assembly interface with a substitute thread bolt (262) with a right-hand thread (81) and a left-hand thread (71) is shown. In this regard, in figures 16 to 19, in half-sections, schematic diagrams of a double-thread transmission are shown in four positions. In these figures, the substitute thread bolt (262) has at the front a right-hand tightening thread (81) with four threads and at the rear a left-hand driving thread (71) with seven threads. The mathematical values ​​of both thread pitches are the same, for example, for both thread pairs (73, 83). The substitute thread bolt (262) is shown in a side view.

[0059] 16 to 19, the lift nut (220) is similarly prevented from rotating with respect to the fixed nut (210). The stoppers (215, 225), the lift nut stopper (222), and the fixed nut stopper (212) are substantially the same as those shown in FIGS.

[0060] According to Fig. 16, all three parts of the combination consisting of the lifting nut (220), the substitute threaded bolt (262) and the fixing nut (210) are in the starting state after the substitute threaded bolt (262) has been inserted into the fixing nut (210). Again, the thread flank transitioning to the front end face of the substitute threaded bolt (262) abuts against the rear thread flank of the rear thread of the tightening internal thread (82).

[0061] Now, when the substitute threaded bolt (262) is rotated 360° clockwise, the first thread is screwed into the fixing nut (210) by, in this case, for example, 5LE (see FIG. 17). At the same time, the lift nut (220), which is stopped by the fixing nut (210), also slides by one thread, i.e., also by, for example, 5LE, in the direction of the lift nut (220). As a result, the lift nut stopper (222) moves by 10LE towards the fixing nut stopper (212). The tightening stroke H is given by the following formula in this embodiment: H = U × (p S +p A )

[0062] In Figures 18 and 19, the substitute threaded bolts (262) are each screwed in one full right turn. After the third full turn, the lift nut stopper (222) contacts the fixed nut stopper (212). In this case, the substitute threaded bolts (262) are seated in the fixed nut (210) and the lift nut (220) with three threads each.

[0063] In this case, for example, the pitches and thread diameters of the thread pairs (73, 83) are identical, so that each thread pair (73, 83) has the same or approximately the same number of supporting threads.

[0064] In the embodiment according to Figs. 9 to 11, a threaded bolt (62) is used which uses an LH thread of M1.8x0.2 as the driving external thread (71). The tensioning external thread (81) is a coarse thread of M1.6x0.35. The intermediate area (75) located between the two threads is a cylindrical pin (76) whose diameter corresponds to the root diameter of the tensioning external thread (81). The diameter is the head diameter of the driving external thread (71) and may be enlarged. The gripping section (85) has a cylindrical shape according to Fig. 9.

[0065] In Fig. 10, the superstructure support 22 together with the threaded bolt 62 is shown inserted into the implant body 10. A stop pin 48, made of plastic by way of example only, is inserted in a frictionally locked manner into the upper part of the bore 51 of the superstructure support 22, which limits the threaded travel of the threaded bolt 62 when it is screwed into the left-hand driving thread 71. Before mounting the superstructure support 22 into the implant body 10 to be implanted, the stop pin 48 is removed to make room for tools.

[0066] FIG. 11 shows the completed assembly interface after the threaded bolt (62) has been screwed clockwise into the right-hand threaded internal locking thread (82) of the implant body (10).

[0067] All threads shown in the examples are metric threads according to DIN 13. Instead of metric threads, trapezoidal, flat, buttress, round or dairy threads, pipe threads, Whitworth threads, UNF / UNC threads, etc. can also be used. All threaded bolts (60-62) are made, for example, from TiAL6V4 or TiAL6V4ELI.

[0068] In this embodiment, the adhesive body (100) is glued or cemented to the superstructure support (20) (see FIG. 2). The adhesive body (100) is a hollow body that is arranged inside the prosthetic tooth, between the superstructure support (20) and the artificial crown (120). The adhesive body adjusts, among other things, the angular position of the crown (120) to the angular position of the implant post (23).

[0069] The adhesive body (100) has a substantially pot-like shape. The inner wall (105) of the adhesive body is adapted to the outer wall (26) of the implant post (23) including the upper edge surface (37). With a play of, for example, 30-50 μm, the adhesive body (100) rests over a large area on the implant post (23) of the superstructure support (20) via the adhesive (113).

[0070] The adhesive body (100) has a lower edge which rests on the upper edge surface (37) of the superstructure support (20). In the area of ​​the upper surface (102), the adhesive body has an inner cavity (106) which, in the assembled prosthesis state, forms an extension of the upper part of the inner cavity (51) of the implant post (23).

[0071] According to the embodiment of Fig. 1, here a dental crown (120) is placed on the adhesive body (100). The inner wall of the dental crown (120) is thus adapted to the outer wall (101) of the adhesive body (100). Again, there is a play between the outer wall (101) and the inner wall of the dental crown (120), for example of 30 to 50 µm.

[0072] According to Figure 2, in the completed state of the prosthesis, the superstructure support (20) is mounted in a rotationally locked manner by the implant cone (43) and is screwed into the conical seat (14) of the implant body (10). The implant neck (42) and the underside of the implant dish (31) come into contact with the gingiva. [Explanation of symbols]

[0073] 1. Prosthetic dentures Front assembly direction for 5 (60~62) 10 Implant body 11 External thread 12 Implant shoulder 13 Stepped inner space 14 Inner cone, first section, cone, cone seat 15 Inner hex, second section, connecting geometry 17 Threaded hole, third area for (82) 19 Center line 20 Upper structure support for threaded bolt (60) 21 Upper structure support for threaded bolt (61) 22 Upper structure support for threaded bolt (62) 23 Implant Post 26 External surface, radial; external wall 29 Center line 31 Implant dish 33. Edge 35 Groove 37 Flat Edge Top 42 Implant Neck 43 Implant cone, outer cone 44 detent, external hex, interlocking geometry 48 Stopper pin 49 Center line 51 Bent inner cavity 52 First lower section, lower cavity 53 Second area, lower interior space 54 Stopper flange 55 Narrow areas, stopper areas 56 Third Area, Hemispherical Surface 57 Fourth upper section, hole, cylindrical 58 Rear engagement hole Center line of 59 (56,57) 60 Threaded bolt with stopper flange 61 Short thread bolt 62 Screw bolt with multiple reverse threads 63 Pivot area 64 pin, cylindrical, cylindrical pin 65 Tool Receptacle 66 Inner hexagonal part 70 Driving Area 71 Driving male thread, male thread, driving thread, left-hand thread in Figures 9 to 11 and Figures 16 to 19 72 Driving female thread, female thread, driving thread, left-hand thread in Figures 9 to 11 and Figures 16 to 19 73 Drive pair, drive thread, pair 75 Intermediate area 76 Cylindrical pin 77 Cone-shaped pin 78 Stopper flange, stopper area 80 Tightening area 81 Fastening male thread, male thread, fastening male thread 82 Fastening female thread, female thread, fastening thread 83 Fastening pair, fastening thread, pair 85 Grasping area, gripping means 100 Adhesive body, part of hybrid abutment, superstructure 101 Exterior wall, exterior surface 102 Top surface 105 Inner wall, inner surface 106 Inner cavity 113 Adhesive 120 Artificial crowns and superstructures 210 Fixing nut 212 Fixed nut stopper 215 Anti-rotation web 220 Lifting nut 222 Lifting nut stopper 225 Anti-rotation groove 260 Substitute thread bolt with two thread pitches 262 Substitute thread bolts with left and right hand threads 267 Slit, tool receiving part 275 Axis LE Length Unit

Claims

1. An assembly interface using threaded bolts (60-62) between a superstructure support (20-22) supporting a superstructure (100, 120) and an implant body (10) having a fastening female thread (82), - in order to ensure the relative rotational immobility of the assembly interface, the superstructure support (20-22) and the implant body (10) have complementary connection geometries (15, 44), at least in certain areas; the superstructure support (20-22) has an internal cavity (51) open towards the superstructure part (100, 120) and towards the implant body (10), - the inner cavity (51) has an internal driving thread (72) arranged in the area facing the implant body (10), the threaded bolt (60-62) has two external threads (71, 81) arranged one behind the other with or without a gap in the screwing direction into the implant body (10), the first of the external threads being the rear one in the screwing direction is the driving external thread (71) and the second external thread being the front one in the screwing direction is the locking external thread (81), - said two external threads (71, 81) have different pitches, the driving male thread (71) fits into the driving female thread (72) of the inner space (51) of the upper structure support (20-22) and the locking male thread (81) fits into the locking female thread (82) of the implant body (10), the driving male thread (71) and the driving female thread (72) form a driving pair (73), and the locking male thread (81) and the locking female thread (82) form a locking pair (83), a narrow portion (55) is provided in the inner hollow portion (51) of the upper structure support (20-22) in a rear area of ​​the driving female thread (72) in the screwing direction, and a cylindrical pin (64) is provided in the threaded bolt (60-62) rearward of the driving male thread (71) in the screwing direction, and the cylindrical pin (64) can close the narrow portion (55); Assembly interface.

2. An assembly interface as described in claim 1, wherein the threads of the driving pair (73) and the tightening pair (83) have different pitches when the pitch codes are the same.

3. 3. An assembly interface according to claim 1 or 2, wherein, if the threads (71, 72, 81, 82) have the same pitch sign, the threads (71, 72) of the driving pair (73) have a smaller pitch than the threads (81, 82) of the clamping pair (83).

4. 3. An assembly interface according to claim 1 or 2, characterized in that the threads (71, 72, 81, 82) of the driving pair (73) and of the clamping pair (83) have different pitch codes.

5. 5. An assembly interface according to claim 1, 2 or 4, wherein the threads (71, 72) of the driving pair (73) each have a negative pitch sign, i.e. are left-hand threads (71, 72).

6. 6. An assembly interface according to claim 1, wherein the threads of the driving pair (73) and the clamping pair (83) have different thread diameters.

7. 2. The assembly interface of claim 1, wherein the threaded bolts (60-62) have a tool receiving portion (65) at at least one end.

8. 2. An assembly interface according to claim 1, wherein the threaded bolt (60-62) has gripping means (85) at its front end in the screwing direction.

Images