SYSTEM MOUNTING INTERFACE

Description

[0001] The invention relates to a system assembly interface with a multi-part superstructure carrier carrying a superstructure and an implant body having an internal clamping thread, wherein a part of the superstructure carrier is arranged on the implant body via an implant screw bolt.

[0002] In dental implantology, an endosseous implant body is often used to support the prosthesis, for example in the context of fabricating a single tooth replacement. In this case, the implant body, a type of screw dowel, is screwed into a hole artificially created in the patient's jaw. The screwed-in implant body accommodates an implant post in the finished prosthesis. The implant post is securely fastened to the implant body with a special clamping device. A superstructure forming the visible tooth crown is attached directly or indirectly to the implant post, e.g., by bonding. If a bridge, partial, or full denture is required instead of a dental crown, the latter are formed from several combinations of implant bodies and superstructure supports.

[0003] WO 2012 / 039 819 A1 discloses a dental implant abutment system in which a superstructure support without an implant post is attached to an implant body by means of an abutment screw. To enable the screw connection of a prosthesis-supporting implant post to the superstructure support, an implant plate with a central internal thread is formed on the superstructure support, inclined toward the centerline of the implant body. Thus, the superstructure support has two different bores that terminate in three openings in the superstructure support.

[0004] DE 203 03 653 U1 discloses a connecting arrangement comprising a base part and an abutment. These two parts are joined together using a base screw. A crown or other prosthetic component can be attached to the abutment.

[0005] US 2017 / 0231726 discloses an abutment system in which an angled abutment is secured to the implant body by means of a threaded bolt. The threaded bolt has two opposing threads, optionally with different thread pitches.

[0006] DE 101 01 907 A1 discloses a system comprising an implant, an abutment post and a superstructure support, which are connected to each other by means of two identical screw bolts with opposing threads.

[0007] The present invention is based on the problem of improving a system assembly interface between a superstructure support and an implant body in such a way that, on the one hand, secure support of the superstructure is ensured with simple pre- and final assembly and, on the other hand, that no measurable tensions occur in the case of several implant bodies supporting a partial or total prosthesis despite static overdetermination.

[0008] This problem is solved with the features of patent claim 1. The superstructure support consists of a main superstructure support and an attachment support detachably screwed to it. The main superstructure support has a recess open towards the attachment support and the implant body. An internal drive thread is arranged in the recess in the area facing the implant body. The implant screw bolt has two external threads arranged one behind the other with or without a gap, the first of which is an external drive thread and the second of which is an external clamping thread. Both external threads have different pitches with the same or different pitch signs. The external drive thread fits into the internal drive thread of the recess of the main superstructure support, and the external clamping thread fits into the internal clamping thread of the implant body.The attachment beam has a recess open toward the superstructure and the superstructure main beam. An internal drive thread is located in the recess in the area facing the superstructure main beam. Between the respective superstructure main beam and the attached attachment beam is an attachment bolt with opposing external drive threads and external clamping threads. Furthermore, the external drive thread of the attachment bolt engages the internal drive thread of the attachment beam.

[0009] The invention creates a system assembly interface that connects an implant body to a superstructure via a superstructure main support and an attachment support. The superstructure main supports and the attachment supports between the implant body and the superstructure can be pivoted relative to each other in the assembly joints. Furthermore, there are a variety of superstructure main supports and attachment supports that differ from each other only in that they have different angles. In this way, the implant body, the superstructure main support, and the attachment support form a support with two assembly joints, which is connected to one another via screw bolts and / or screws – usually not in a straight line.All three essentially tubular components are closed all around except for an opening at the end, in whose internal thread the superstructure is held by means of a screw bolt or screw, so that almost no notch effects that negatively affect the component strength occur along the newly created support.

[0010] Of course, the screw bolt in the first assembly joint can be replaced with a screw with a screw head.

[0011] Further details of the invention emerge from the subclaims and the following description of schematically illustrated embodiments. Figure 1: Longitudinal section through a system assembly interface of an implant-supported complete denture; Figure 2: Longitudinal section through a prosthetic dental prosthesis in the form of a partial denture; Figure 3: Longitudinal section through a system assembly interface with multiple bends; Figure 4: Perspective view of Figure 3 ; Figure 5: Perspective view of a long implant screw bolt; Figure 6: Perspective view of an attachment support screw; Figure 7: Perspective view of a short implant screw bolt; Figure 8: Perspective view of an attachment support screw bolt; Figure 9: Perspective view of a superstructure main support with conical post; Figure 10: Perspective view of a straight superstructure main support with ball post; Figure 11: as Figure 10 , but with an angled recess for receiving a top support fastening device; Figure 12: as Figure 11, but with a larger angle; Figure 13: perspective view of a straight top support with support plate; Figure 14: as Figure 13 , but with angled top support post; Figure 15: as Figure 14 , but with a more angled top support post; Figure 16: Longitudinal section to Figure 15 ; Figure 17: perspective view of a straight support beam without support plate; Figure 18: how Figure 17 , but as an angled attachment support; Figure 19: as Figure 18 , but with a greater angle; Figure 20: perspective view of a straight follower pin with anti-twist device;

[0012] The Figure 1shows a prosthetic dental replacement (1) in the form of a complete denture. The latter is constructed on several implant bodies (10) screwed into the jawbone (3). The jawbone section shown is located - viewed from the patient - in the area of ​​the molars on the right side of the jaw. The section is oriented perpendicular to the occlusal plane. In the implant body (10), a conical seat (14) contains an angled superstructure main support (20), cf. also Figure 9The superstructure main support (20) is held in the conical seat (14) by means of a special screw bolt (60). A top support (240) sits on the individual superstructure main support (20) - screwed to it by means of a top support screw (160). The top support (240) is part of a dimensionally stable metal or plastic reinforcement (7). The crowns (9), made of ceramic, for example, are anchored in the reinforcement (7). Between the gum (4) and the crown (9), the reinforcement (7) is surrounded by an elastic plastic as a replica of the artificial gum (8) surrounding the crowns (9).

[0013] For cleaning and maintenance purposes, the complete denture is removed from the superstructure main support (20) in a biannual cycle, for example. To enable this, the attachment support screws (160) are accessible with little effort. For this purpose, the crowns (9) arranged above the implant bodies (10) in the denture (1) are each provided with a bore (121), to which Figure 1 e.g., a bore (122) connects to the reinforcement (7). The bore (121) and part of the bore (122) are sealed with a plug (123) made of a plastic cured under UV light. A Teflon tape (124) is caulked as filler material between the plug (123) and the top support screw (160) in the central bore (244) of the top support (240).

[0014] After easily drilling out the plug (123), the Teflon tape (124) can be pulled out so that the attachment support screw (160) can then be loosened.

[0015] The Figure 2 shows, for example, a bridge (2) as a prosthetic dental replacement, consisting of two to four incisors. The longitudinal section of the lower jaw runs through one of the front incisors, which is supported in the jawbone (3) by the implant body (10). Here, the crown (9) is mounted directly on the short attachment support (240). The holes (121, 122) are sealed as previously described.

[0016] The basis of the prosthetic denture (1) is an implant body (10) that can be screwed into the jawbone. It is a hollow screw with a possibly self-tapping, e.g., non-metric external thread. Approximately in the upper half, the implant body (10) has a multi-level recess (13), which is divided into three zones (see Fig. Figures 1 , 2 and 3The first zone (14) – located in the area of ​​the implant shoulder (12) of the implant body (10) – is an internal cone with a cone angle of, for example, 18 degrees. The internal cone (14) merges into a hexagon socket (15) in the second zone, which serves as an anti-twist device (44). Instead of the hexagon socket (15), a double hexagon socket or another positive or non-positive anti-twist device can be used as the coupling geometry. The first and second zones (14, 15) form the first assembly joint (41).

[0017] The third zone (17) is a threaded hole with an internal clamping thread (82), which, during assembly, accommodates the screw bolt (60) holding the superstructure main beam (20). The right-hand internal clamping thread (82) is, for example, an M 1.6 × 0.35 thread according to DIN 13, Sheet 1.

[0018] The primary function of the superstructure support (20)—seated in the implant body (10)—is to serve as the first base for the artificial tooth crown (1, 2). It has a region facing the implant body (10) and a region facing the attachment support (240).

[0019] The area facing the implant body (10) is the implant neck (42) with its outer cone (43) and its external hexagon (44). The outer cone (43) and the external hexagon (44) fit precisely in the recess (13) of the implant body (10). In the axial direction toward the tip of the implant body (10), the end faces of the external hexagon (44) do not contact the recess (13).

[0020] Above the implant neck (42) there is an implant plate (31), which optionally emerges from the implant neck (42) with a continuous transition. The implant plate (31) has, at least in part or in part, the shape of a plane or the shape of a truncated cone, the cone angle of which opens towards the tooth crown (9). For example, the underside of the implant plate (31) also consists of several conical sections extending from one another, each of which encloses a different angle with respect to the center line (29). The outer edge (33) of the implant plate (31) is at a distance from the center line (29) which, for a 360° rotation around the center line (29), is, for example, 4.5 mm.

[0021] Above the implant plate (31), which has a flat upper edge (37), rises a conical implant post (23). The flat upper edge (37) may form a seating surface for the attachment support (240). The implant post (23) is designed according to the Figures 1and 2 a conical post (24) with an anti-rotation device (238) in the form of an external hexagon. The surfaces of the external hexagon are either oriented parallel to the center line (59) or they are partial surfaces of a straight pyramid with six edges. The conical post (24) and the anti-rotation device (238) form a centering second assembly joint (239).

[0022] If necessary, the superstructure main support (20) is coated with a titanium nitride coating, at least above the implant plate (31). The coating thickness is, for example, 1 to 4 µm. Alternatively, thin-walled ceramic or copolymer coatings can also be applied there.

[0023] After the Figures 1 and 2the superstructure main support (20) has a continuous recess (51) which has a kink in the upper area with a kink angle of, for example, 11 degrees. The finished recess (51) consists of four zones. The first (52) and the second zone (53) are used to insert the screw bolt (60). The first, lower zone (52) is a cylindrical bore. Its center line (49) coincides with the center line (29). Adjoining it as the second zone (53) is, for example, a right-hand internal thread (72), which is designated M 1.8 × 0.2 according to DIN 13, Sheet 2. The transition between the internal thread (72) and the bore (52) is formed by a flat stop collar (54).

[0024] The fourth, upper zone (57) is also a cylindrical bore with an internal thread (27). Its centerline (59) intersects the centerline (29) in the third zone (56), e.g., at an angle of 11 degrees. The upper zone (57) serves, on the one hand, for the insertion of the tool with which the screw bolt (60) is tightened. On the other hand, it is also the seat of the attachment support screw (160). The third zone (56) represents a rounded transition area, which, for example, has areas of the lateral surface of a hemisphere.

[0025] The system according to the Figures 3 and 4uses a superstructure main support (21b) which terminates in a spherical post (25) on the attachment support side. The implant cone (43) transitions tangentially – without any jump, edge, or implant plate – into the spherical shape of the spherical post (25). The center line (59) forms an angle of 158 degrees with the center line (29) at the intersection point (36). Thus, the bend angle or angulation of the center line (59) relative to the center line (29) is 11 degrees. The intersection point (36) is also the center point of the spherical shape of the spherical post (25). This applies to both the outer wall and the wall of its central recess.

[0026] In the Figures 10-12 three further superstructure main beams (21a, 21c, 21d) of this series are shown.

[0027] The Figure 10shows a straight superstructure main beam (21a) in which the center line of the ball post (25) coincides with the center line of the structural main beam (21a). The ball post (25) ends, according to the Figure 3 , towards the attachment support (243) in a conical seat (28) into which four notches are machined. The surface lines of the surface of the conical seat (28), which intersect at a point on the center line (59), lie tangentially against the spherical surface of the ball post (25).

[0028] The notches have four flanks, the surface normals of which are oriented parallel to the center line (59) on the one hand and lie in one plane on the other. These four flanks, as plate segments (32), form an implant plate integrated into the envelope geometry of the conical seat (28). In total, they are comparable to the upper edge surface (37) of the superstructure main support (20). The four other flanks of the notches lie in planes aligned parallel to the center line (59) and represent part of the side surfaces of an imaginary cube. These flanks, which are equidistant from the center line (59), form the anti-rotation device (238).

[0029] The Figure 11 The superstructure main beam (21c) shown has a 30° bend, while the superstructure main beam (21d) of the Figure 12a 45° angle. Of course, there is also a superstructure main beam in this series with an 11° angle. The angle of the individual superstructure main beams can also be implemented in three- or five-degree increments.

[0030] The individual screw bolt (60, 61) is generally divided into four sections. These are, arranged from front to back, a pivot section (63), a drive section (70), an intermediate section (75), and a clamping section (80), see Fig. Figures 5 and 7 .

[0031] A tool recess (65) is machined into the articulation area (63). It is designed according to the Figures 5 and 7For example, a hexalobular socket (66) with a wrench size of, for example, 1.28 mm. Instead of the hexalobular socket, a hexagon socket, an internal multi-tooth socket, a Phillips recess, a slot, or the like can also be provided. Another drive variant is an external hexalobular socket or external hexagon. The hexalobular or hexagonal shapes may be barrel-rounded in the axial direction.

[0032] The drive area (70) has the Figures 5 and 7 a fine thread of type M 1.8 × 0.2. Other fine threads as drive threads (71, 72), such as M 2 × 0.25, M 1.8 × 0.2, M 1.6 × 0.25, or M 1.6 × 0.2, are also conceivable.

[0033] The intermediate area (75) adjoining the drive area (70) serves as a spacer to the subsequent clamping area (80). The intermediate area (75), after Figure 5, consists of a cylindrical pin (76) and a stop flange (78). If necessary, the outer diameter of the cylindrical pin (76) corresponds to the core diameter of the external drive thread (71).

[0034] A disc-shaped stop flange (78) adjoins the cylindrical pin (76) toward the clamping area (80). The stop flange (78) has a wall thickness of, for example, 0.2 mm and an outer diameter of, for example, 1.8 mm. The stop flange (78) has a notch (79) parallel to the screw centerline, which allows for the venting of the threaded bore of the implant body (10).

[0035] The clamping area (80) represents an external clamping thread (81). In this case, for example, it is a 1.46 mm long M 1.6 × 0.35 standard thread according to DIN 13, Sheet 1.

[0036] Figure 1shows the superstructure main beam (20) after inserting the screw bolt (60). For assembly, the screw bolt (60) is screwed with its external drive thread (71) into the area of ​​the internal drive thread (72) until the stop flange (78) of the screw bolt (60) rests against the stop collar (54), see. Figures 1 , 2 and 3 The screw bolt (60) is now securely seated in the superstructure main beam (20) in its rear position. In this form, the combination of the superstructure main beam (20) and the screw bolt (60) can be marketed.

[0037] After inserting the superstructure main support (20) into the stepped recess (13), the external clamping thread (81) is screwed into the internal clamping thread (82) of the implant body (10) by turning the screw bolt (60) clockwise. This draws the superstructure main support (20) into the implant body (10). The screwing-in process is complete as soon as the implant cone (43) is firmly seated in the internal cone (14) of the implant body (10). All four threads of the external clamping thread (81) are seated in the internal clamping thread (82). Likewise, the majority of the threads of the external drive thread (71) are seated in the internal drive thread (72).

[0038] The screw bolt (61) of the Figure 7 serves to fix the superstructure main support (21a, 21b, 21c, 21d) in the implant body (10), cf. Figures 3 and 4 It is largely comparable to the screw bolt (60). Essentially, the intermediate section (75) is shorter.

[0039] In the Figures 13-16A support beam group consisting of three support beams (221-223) is shown. Each of these support beams (221-223) has a base section (225), a support beam plate (228) for supporting a superstructure (1, 2), and a support beam post (233).

[0040] All attachment beams (221-223) in this group are suitable for mounting on the superstructure main beams (21a-21d). A bolt (161) with opposing threads is located between the respective superstructure main beam and the attachment beam mounted on it.

[0041] The attachment screw bolt (161) is in Figure 8 It is constructed similarly to the screw bolts (60) and (61).

[0042] Between a drive section (170) and a clamping section (180) is a stop flange (178), the diameter of which is larger than the maximum thread diameter of the clamping section (180). The external drive thread (171) corresponds to an M 1.6 × 0.2 thread according to DIN 13. The larger diameter external clamping thread (181) is an M 1.8 standard thread. The tool recess machined into the drive section (170) is, for example, a hexalobular socket.

[0043] All threads shown in the examples are metric threads according to DIN 13. Instead of metric threads, trapezoidal threads, flat threads, buttress threads, round or milk threads, pipe threads, Whitworth threads, UNF / UNC threads, or similar can also be used. All screw bolts (60, 61) are made of TiAL6V4 or TiAl6V4 ELI, for example.

[0044] The base section (225) of each attachment beam widens from the lower end face toward the attachment beam plate (228). The attachment beam post (233) located above the attachment beam plate essentially has the shape of a straight cone that tapers upwards—i.e., away from the attachment beam plate (228). The attachment beam post (233) has several circumferential grooves in its lower third, which are interrupted by a laterally projecting anti-rotation bar (234). This creates a torsion-proof base for the superstructure (1, 2) to be supported.

[0045] All attachment supports (221-123) have a continuous, multi-stepped recess (251), which has a conical seat (226) in the lower area, cf. Figure 16. In the conical seat (226) there are four webs (227) which fit positively into the notches of the anti-twist device (32, 238). The conical seat (226) opens into a short cylindrical recess for receiving the clamping area (180) of the attachment screw bolt (161), see Figure 3. The cylindrical recess is followed by the internal drive thread (172) into which the external drive thread (171) of the attachment screw bolt (161) engages. The diameter of the cylindrical recess is larger than the core diameter of the internal drive thread (172) of the attachment screw bolt (161). This creates a stop collar against which the stop flange (178) of the attachment screw bolt (161) comes to rest during pre-assembly.

[0046] The base section (225) of the top support (222) is angled by 11 degrees relative to the top support post (233). For the top support (223), this angle is 22 degrees.

[0047] The Figures 17 to 20show the attachment supports (241-243). All of these attachment supports consist of a straight or cylindrical tube, which has a smooth wall in the lower section and, for example, circumferential grooves (246) in the upper section. The tube has an outer diameter of, for example, 3.24 mm. In the example shown, the grooves have a radius of 0.45 mm. The pitch from groove to groove is 1.1 mm. The smallest inner diameter of the tube is 1.62 mm.

[0048] According to Figure 18 The smooth-walled area of ​​the support beam (242) is angled by eleven degrees relative to the grooved area. Figure 19 The angle is 22 degrees. The geometric shape of the second assembly joint of the add-on supports (241-243) corresponds to the geometric shape of the add-on supports (221-223). The same applies to the Figure 20The scanning gauge (270) shown here has a scanning tooth (271) projecting radially on one side at its free end. The scannable, 2.5 mm thick scanning tooth (270) has two parallel end faces and two tooth flanks enclosing a 40° angle.

[0049] Using any combination of straight or angled superstructure main supports (20; 21a-21d) and straight or angled attachment supports (221-223; 240-243), a multitude of angular positions can be created between the implant body and the position of the attachment supports, taking into account the fact that the supports can also be positioned rotated relative to each other. The number of angular positions also increases if, in one case or another, the anti-rotation device between the individual superstructure main support (20; 21a-21d) and the individual attachment support (221-223; 240-243) is omitted. List of reference symbols:

[0050] 1Denture, prosthetic, partial or complete denture, superstructure 2Denture, prosthetic, bridge, superstructure 3Jawbone 4Gum 7Framework, reinforcement 8Gum replica, elastic 9Crown 10Implant body 12Implant shoulder 13Recess, stepped 14Inner cone, first zone, cone, cone seat 15Inner hexagon, second zone, coupling geometry 17Threaded hole, third zone for (82) 20Superstructure main beam to screw bolt (60) 21aSuperstructure main beam to screw bolt (61), straight 21bSuperstructure main beam to screw bolt (61), 22° angle 21cSuperstructure main beam to screw bolt (61), 30° angle 21dSuperstructure main beam to screw bolt (61), 45° angle 23Implant post 24Conical shape, hollow cone, conical post 25Spherical shape, hollow sphere, ball post 27Internal thread for (160) 28Conical seat, parts of a notch, anti-twist device 29Center line 31Implant plate 32Plate segments, part of a notch 33Edge 36Center point, intersection point 37Top of the edge, flat 41First assembly joint 42Implant neck 43Implant cone, outer cone 44Anti-rotation device, external hexagon, coupling geometry 51Recess, possibly bent 52First, lower zone, lower recess 53Second zone, lower recess 54Stop collar 56Third zone, hemispherical surface 57Fourth, upper zone; bore, cylindrical 59Center line of (56, 57) 60Screw bolt with stop flange, long 61Screw bolt with opposing threads 63Articulation area 65Tool recess 66Hexalobular, hexagon socket 70Drive range 71External drive thread, external thread, drive thread, left-hand thread 72Internal drive thread, internal thread, drive thread, left-hand thread 73Drive pairing, drive thread, pairing 75Intermediate area 76Cylinder pin 78Stop flange, stop collar 79Notch 80Clamping range 81External clamping thread, external thread, clamping thread 82Internal clamping thread, internal thread, clamping thread 83Clamping pairing, clamping thread, pairing 121Hole in (9) 122Hole in (7) 123Closing plug for (9) and / or (240) 124Filling material, unglued; Teflon tape 151Recess, possibly bent 160Top support screw with head, short 161Top screw bolt with opposing threads; top support fastening means 162Screw head seating surface, conical 165Tool recess 166Hexagon socket 167Screw head, radially outside cylindrical 168External thread 170Drive range 171External drive thread, external thread, drive thread, left-hand thread 172Internal drive thread, internal thread, drive thread, left-hand thread 173Drive pairing, drive thread, pairing 178Stop flange, stop collar 180Clamping range 181External clamping thread, external thread, clamping thread 182Internal clamping thread, internal thread, clamping thread 183Clamping pair, clamping thread, pairing 185External thread, right-hand thread 221Top bracket with plate, straight 222Top bracket with 11° angle 223Top bracket with 22° angle 225Base section 226Conical seat 227Webs 228Extension carrier plate 233Top support post 234Anti-twist bar 238Anti-twist, external square, coupling geometry 239Second assembly joint 240Top support, short with grooves, straight 241Top support, long with grooves, straight 242Top support, long with 11° angle 243Top support, long with 22° angle 244Hole, central 246Grooves 251Recess, possibly bent 270Scanning gauge 271Scanning tooth

Claims

1. System assembly interface with a multi-part superstructure carrier (20, 21a-21d; 221-223; 240-243) carrying a superstructure (1, 2) and an implant body (10) having an internal clamping thread (82), wherein a part of the superstructure carrier (20, 21a-21d; 221-223; 240-243) is arranged on the implant body (10) via an implant screw bolt (60, 61), - wherein the superstructure carrier (20, 21a-21d; 221-223; 240-243) consists of a superstructure main carrier (20, 21a-21d) and of an attachment carrier (221-223; 240-243) detachably screwed to it, - wherein the superstructure main carrier (20, 21a-21d) has a recess (51) open towards the attachment carrier (221-223; 240-243) and towards the implant body (10), - wherein an internal drive thread (72) is arranged in the recess (51) in its region facing the implant body (10), - wherein the implant screw bolt (60, 61) has two external threads (71, 81) arranged one behind the other with or without spacing, of which the first is a drive external thread (71) and the second is a clamping external thread (81), - wherein both external threads (71, 81) have different pitches with the same or different pitch signs, - wherein the external drive thread (71) fits into the internal drive thread (72) of the recess (51) of the superstructure main carrier (20, 21a-21d) and the external clamping thread (81) fits into the internal clamping thread (82) of the implant body (10), - wherein the attachment carrier (221-223; 240-243) has a recess (151) open towards the superstructure (1, 2) and the main superstructure carrier (20, 21a-21d), - wherein a drive internal thread (172) is arranged in the recess (151) in its region facing the superstructure main carrier (20, 21a-21d), - wherein between the respective superstructure main carrier (20, 21a-21d) and the attachment carrier (221-223; 240-243) placed thereon there is an attachment screw bolt (161) with an opposing external drive thread (171) and external clamping thread (181), and - wherein the external drive thread (171) of the attachment bolt (161) engages in the internal drive thread (172) of the attachment carrier (241 - 243).

2. System assembly interface according to claim 1, characterised in that the superstructure main carrier (20, 21a-21d) has an implant post (23) which is angled with respect to an implant cone (43).

3. System assembly interface according to claim 2, characterised in that the implant post (23) of the superstructure main carrier (20, 21a-21d) has a conical or tapered shape (24, 25).

4. System assembly interface according to claim 1, characterised in that the attachment carrier (221-223; 240-243) is either a straight hollow extension of the implant post (23) or forms an angled tubular component.

5. System assembly interface according to claim 1, characterised in that the implant body (10) and the superstructure main carrier (20, 21a-21d) have an at least partially complementary coupling geometry (44) for securing the torsion resistance of a first assembly joint (41).

6. System assembly interface according to claim 1, characterised in that the superstructure main carrier (20, 21a-21d) and the attachment carrier (221-223; 240-243) have a complementary coupling geometry (238), at least in certain areas, for securing the torsion resistance in a second mounting joint (239).

7. System assembly interface according to claim 1, characterised in that the recess (51) passes through the superstructure main carrier (20, 21a-21d) and the recess (151) passes through the attachment carrier (221-223; 240-243) in each case between the front and the rear end.

8. System assembly interface according to claim 1, characterised in that the two drive threads (71, 72; 171, 172) form a drive pairing (73, 173) and the two clamping threads (81, 82, 181, 182) form a clamping pairing (83, 183),9. System assembly interface according to claims 1 and 8, characterised in that the threads (71, 72) of the drive pairing (73) - with the same pitch sign of the threads (71, 72, 81, 82) - have a smaller pitch than the threads (81, 82) of the clamping pairing (83).

10. System assembly interface according to claims 1 and 8, characterised in that the threads (71, 72, 81, 82) of both pairs (73, 83) have different pitch signs.

11. System assembly interface according to claims 1, 8 and 10, characterised in that the threads (71, 72; 171, 172) of the drive pairing (73, 173) each have a negative pitch sign, i.e. are left-climbing threads (71, 72; 171, 172).

12. System assembly interface according to claim 1, characterised in that the diameter of the clamping external thread (181) of the top screw bolt (161) is larger than the diameter of its drive external thread (171).

13. System assembly interface according to claim 1, characterised in that the screw bolt (60, 61; 160, 161) has a stop collar (54, 78; 154, 178) between or - in the clamping screw-in direction - behind the external threads (71, 81; 171, 181).