DENTAL IMPLANT SYSTEM

Abstract

A dental implant system includes an anchoring part of a ceramic material and an insertion tool. The anchoring part includes an outer thread that defines an axis. The anchoring part has a recess for an engagement of a fastening post of an abutment as well as for an engagement of an insertion tool, the recess being open towards the coronal end. The recess has an inner structure region with an inner structure that forms an insertion geometry for interacting with a corresponding outer structure of the insertion tool, and the insertion tool has an engagement portion with the corresponding outer structure. The recess forms a support region coronally of the inner structure region, wherein a transition region with a surface which in the longitudinal section is concavely arcuate and/or conical is formed between the support region and the inner structure region.

Claims

1. A dental implant system comprising an anchoring part for anchoring in bone tissue, wherein the anchoring part is manufactured of a ceramic material, and an insertion tool, wherein the anchoring part comprises an outer thread which defines an axis, wherein the anchoring part comprises a recess for an engagement of a fastening post of an abutment as well as for an engagement of the insertion, said recess being open towards a coronal end, wherein the recess comprises an inner structure region with an inner structure forming an insertion geometry for interacting with a corresponding outer structure of the insertion tool, and wherein the insertion tool comprises an engagement portion with a corresponding outer structure, wherein the recess coronally of the inner structure region forms a support region, wherein a transition region with a surface, which in the longitudinal section is concavely arcuate and/or conical, is formed between the support region and the inner structure region, wherein the insertion tool coronally of the engagement portion forms a widening merging into the engagement portion via a transition portion, and wherein a surface of the insertion tool in a longitudinal section is convexly arcuate in the region of the transition portion, so that a wedging connection between the insertion tool and the anchoring part results in this region when the transition portion (58) abuts on the transition region.

2. The system according to claim 1, wherein the support region is conical.

3. The system according to claim 1, wherein the transition region is arcuate in a longitudinal section, wherein where the transition portion abuts on the transition region, a curvature of the transition region in the longitudinal section is smaller than a curvature of the transition portion in the longitudinal section.

4. The system according to claim 1, wherein the transition region is conical where the transition portion abuts on the transition region.

5. The system according to claim 1, wherein the recess apically of the engagement portion forms an inner threaded region with an inner thread.

6. The system according to claim 1, wherein the widening of the insertion tool forms a guide portion, whose shape qualitatively corresponds at least approximately to the shape of the support region.

7. The system according to claim 6, wherein the guide portion is conical.

8. The system according to claim 1, wherein the anchoring part is designed as a bone-level anchoring part.

9. The system according to claim 1, wherein the shapes of the support region and of the insertion tool are matched to one another such that when the engagement portion of the insertion tool is inserted into the recess, and the transition portion abuts on the transition region, a gap between the insertion tool and the inner wall of the recess and which extends in the peripheral direction is formed coronally of the transition region.

10. The system according to claim 1, comprising an abutment of a ceramic material, with a fastening post for engaging into the recess.

11. The system according to claim 10, wherein the fastening post forms a support portion, which in its shape is matched to the support region in an exactly fitting manner.

12. The system according to claim 10, further comprising an abutment screw, wherein the abutment comprises an opening which is continuous in the axial direction and into which the abutment screw can be inserted, wherein the abutment screw is configured, for a fastening of the abutment to the anchoring part, to engage into an inner thread which is formed by the recess.

13. The system according to claim 12, wherein the abutment screw is manufactured from a ceramic material.

14. The system according to claim 11, further comprising an abutment screw, wherein the abutment comprises an opening which is continuous in the axial direction and into which the abutment screw can be inserted, wherein the abutment screw is configured, for a fastening of the abutment to the anchoring part, to engage into an inner thread which is formed by the recess.

15. The system according to claim 14, wherein the abutment screw is manufactured from a ceramic material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The subject-matter of the invention is hereinafter represented by way of preferred embodiment examples, which are represented in the accompanying drawings. In part, scales that are different from figure to figure are shown:

[0043] FIG. 1 an implant system with an anchoring part, abutment, abutment screw and screw tool, in a front elevation;

[0044] FIG. 2 a sectioned representation (sectioned parallel to the axis) of the system according to FIG. 1;

[0045] FIG. 3 a representation according to FIG. 2 of the system during the putting-together;

[0046] FIG. 4 a view of the anchoring part with an insertion tool;

[0047] FIG. 5 a sectioned representation according to FIG. 4;

[0048] FIG. 6 a sectioned representation of the anchoring part and insertion tool during the engagement of the insertion tool into the recess of the anchoring part; and

[0049] FIG. 7 a detail of FIG. 6.

DETAILED DESCRIPTION OF THE INVENTION

[0050] In the figures, the same reference numerals indicate equal or analogous parts.

[0051] The dental implant (anchoring part 1), which, for example, is represented in FIGS. 1-3 includes an outer thread 11 that extends over almost the entire length, almost up to the coronal end and defines an axis 100. The anchoring pat 1 has an apically slightly tapering shape, so that in cross section along a plane parallel to the axis 100 as a whole it is slightly convexly arcuate with the exception of thread deepenings and apical clamping grooves 12 and as a whole merges continuously from a coronally roughly cylindrical into an apically tapering shape. The outer thread 11 has a non-constant thread depth and is for fashioned to be self-cutting.

[0052] A recess 13, into which a fastening post 21 of an abutment 2 projects in the completed, implanted state is open towards the coronal end. The recess forms a coronal support region 18, apically of this an insertion geometry region 19 and apically of this an inner thread region 17. The support region 18 as a whole has a conical course with a coronally slightly widening diameter. In the insertion geometry region 19, the recess forms an insertion geometry by way of it not running rotationally symmetrically about the axis 100. In the represented embodiment example, an equilateral hexagon with rounded corners is formed in the cross section along a plane perpendicular to the axis, wherein it is cylindrical in the sense that it has a constant cross section along the axis. The inner threaded region is provided with an inner thread, which is matched to a screw thread of the abutment screw.

[0053] In the represented embodiment example, the anchoring part is a bone-level implant, concerning which the implant shoulder 10 with a circular edge that terminates the inner connection between the anchoring part 1 and the abutment 2 is at bone-level. The invention however can also be applied to other two-part implant systems, specifically to tissue-level implants, concerning which, for example, a transgingival region that is widened, for example in a tulip-like manner, is formed on the anchoring part coronally of the enossal part with the thread.

[0054] Apart from the fastening post 21, the abutment 2 includes a coronal post 23 for fastening a superstructure. A transgingival region 22, which is adapted, for example, to the expected course of the gingiva, is formed apically of this. The shapes of such a transgingival region 22 as well as of the post 23here drawn with an optional flatteningincluding its angle to the fastening post and therefore to the axis 100 are adapted to the specific requirements and depending on where the implant is placed or has been placed in the jaw. In particular, an implantation set with at least one anchoring part can include several different abutments for different implantation situations.

[0055] A support portion 26, which in its shape is matched to the support region 18, is formed on the fastening post 21, and a rotation lock structure 27 is formed apically of this. The rotation lock structure has a hexagonal shape, likewise with rounded edges.

[0056] The abutment includes an axially continuous opening 29 for the abutment screw. This further forms a shoulder 24 for the head of the abutment screw. Furthermore, an optional abutment inner thread 25 for a so-called retrieval tool (a tool for removing the abutment) is present at the opening.

[0057] The abutment screw 3 has a shank region with the outer thread 33, which is matched to the inner thread of the anchoring part, as well as a screw head 31, which forms a screw stop 32 in the apical direction. A coronally open recess with an engagement structure 34, designed here in the shape in an internal hex, for a screwdriver 4, is formed in the screw head. The screwdriver 4 accordingly includes an engagement portion, in the represented example with a hexagonal structure. In embodiments, the engaging structure and the engagement portion taper slightly apically, i.e. are shaped in a slightly conical manner, so that the screwdriver easily wedges with the abutment screw given a slight pushing-in and therefore holds this on the screwdriver. Coronally, the screwdriver includes an adapter head 41, for example for a ratchet with an adjustable torque.

[0058] FIG. 3 shows the implant system during the procedure of the abutment fastening, before the application of the superstructure (tertiary structure). The thread 33 of the abutment screw 3 is received apically by the respective inner thread of the anchoring part 1. The abutment screw 3 fixes the abutment 2 relative to the anchoring part with regard to a pulling-apart in the axial direction. Herein, the abutment is supported and guided in the support region by way of the supporting portion 26 bearing extensively on the inner surface of the recess there. The abutment is secured in this position with respect to rotations, by way of the rotation lock structure 27 engaging into the coronal region of the insertion geometry.

[0059] FIGS. 4-6 show the anchoring part 1 with the insertion tool 5. The insertion tool 5 as the previously described screwdriver includes an adapter head 51, for example for a ratchet with an adjustable torque. A guide portion 57, which runs conically as the support region 18, is formed apically of a shank region 52, which connects to the adapter head. Theoptionalconical guide portion 57 simplifies the introduction, aligned along the axis, of the insertion tool 5 into the recess 13 by the implantologist. The engagement portion 59 is designed with an outer structure, which corresponds to the engagement region 19, apically of the guide portion. In the represented embodiment example, the engagement portion 59 has a hexagonal structure with a tangential rounding. On inserting (rotating-in) the implant, this design permits the engagement portion to be present on the insertion geometry not only at individual points, but at least along axial lines.

[0060] As one can see particularly well in FIG. 7, which shows a detail VII (FIG. 6), the insertion tool is rounded with a minimal radius of curvature r, in the transition portion 58 between the engagement portion 59 and the guide portion 57.

[0061] The transition region 14 between the conical support region 18 and the inner structure region 19 is likewise arcuate in the represented embodiment example (here too, what is meant by arcuate is a curvature not only in the tangential/circumferential direction, but indeed also in a section along a plane parallel to the axis 100), but with a smaller curvature in the longitudinal a section than the curvature of the transition portion. The curvature of the transition region, where the transition portion of the insertion tool abuts on this, in any case should be smaller in the longitudinal section than the curvature of the transition portion (i.e. the radius of curvature R of the transition region 14 should be larger than the radius of curvature r of the transition portion). This also includes a curvature of zero, i.e. the possibility of the transition region not being arcuate at all, but conical, with a steeper cone angle than the support region.

[0062] On account of this rounding, a stop for the introduction of the insertion tool firstly results. Secondly, a wedging connection 60 results on the one hand between the tool and on the other hand the anchoring part. It is not necessary for the tool to bear on the support region of the recess in the region of the guide portion 57. In contrast, the conical guide portion is mounted in the recess in a floating manner and a very thin gap 61 arises between the insertion tool and the anchoring part in the represented embodiment. This does not exclude slight contacts occurring between the insertion tool and the support region towards the coronal end on account of material elasticity and manufacturing tolerances.

[0063] The conicity of the guide portion 57 does not generally serve for the support of the insertion tool but solely for the guidance, which is why it is also optional given the presence of a conical support region 18 in the anchoring part.

[0064] The fact that the insertion tool does not load the support region is also advantageous with regard to avoiding damage to the anchoring part on inserting. Specifically, this prevents the insertion tool from loading the coronal region of the anchoring part where its material thickness is at a minimum.

[0065] For the application, the anchoring part is firstly implanted in the bone, wherein for this the bone can be prepared in the manner known per se, for example by way of a bore. The insertion tool is used for implantation, wherein the anchoring part holds on the insertion tool on application thanks to the procedure according to the invention, wherein however despite such, this is simple to remove in an almost force-free manner after implantation. The subsequent steps with the healing-in phase (possibly with a cap which is envisaged for this and is placed upon the anchoring part), fastening of a temporary restoration and/or of the abutment, adaptation of the tertiary structure etc. can be carried out as known per se from two-part implant systems.