Impression Post for a Dental Implant

Abstract

An impression post for a dental implant includes one pair of sleeves with an inner sleeve, which has a through bore extending longitudinally of the inner sleeve, and an outer sleeve radially surrounding the inner sleeve, which is detachably connected to the inner sleeve, and a fastening element penetrating the through bore of the inner sleeve for fixing the sleeve pair to the dental implant. The outer sleeve has, at the apical end of the outer sleeves facing the dental implant, a preferably annular planar end face which, when the sleeve pair is fixed to the dental implant, rests on a corresponding, preferably planar end face of the dental implant.

Claims

1. An impression post (10) for a dental implant, comprising: one pair of sleeves with an inner sleeve (50), which has a through bore (64) extending longitudinally of the inner sleeve (50), and an outer sleeve (30) radially surrounding the inner sleeve (50), which is detachably connected to the inner sleeve (50), and a fastening element (70) penetrating the through bore (64) of the inner sleeve (50) for fixing the sleeve pair to the dental implant, wherein the outer sleeve (30) has, at the apical end of the outer sleeves (30) facing the dental implant, a preferably annular planar end face (36) which, when the sleeve pair is fixed to the dental implant, rests on a corresponding, preferably planar end face of the dental implant.

2. The impression post according to claim 1, wherein the planar end face of the outer sleeve consists of a plurality of partial surfaces and the partial surfaces can be brought into contact on one or more corresponding planar end faces of the dental implant during the attachment of the sleeve pair to the dental implant.

3. The impression post according to claim 1, wherein the inner sleeve has a dental implant anti-rotation lock, which is adapted to secure the position of the inner sleeve relative to the dental implant.

4. The impression post according to claim 3, wherein the dental implant anti-rotation lock is formed in the form of at least one face which, when the pair of sleeves is fixed to the dental implant, interacts with a corresponding face on the dental implant to limit the rotatability of the inner sleeve relative to the dental implant.

5. The impression post according to claim 3, wherein the dental implant anti-rotation lock is formed in the form of at least one tongue-groove connection which is engaged when the sleeve pair is fixed to the dental implant.

6. The impression post according to claim 3, wherein dental implant-anti-rotation locks are provided in the form of at least one face and in the form of at least one tongue-groove connection.

7. The impression post according to claim 1, wherein the inner sleeve and the outer sleeve are arranged in a circumferentially fixed position relative to each other.

8. The impression post according to claim 1, wherein the inner sleeve and the outer sleeve are arranged coaxially with each other.

9. The impression post according to claim 6, wherein the inner sleeve has at its occlusal end a sleeve head which, when the pair of sleeves is fixed to the dental implant, can be brought into a corresponding recess of the outer sleeve in rotationally secured engagement.

10. The impression post according to claim 1, wherein the outer sleeve has at least partially a profiling on its outer surface.

11. The impression post according to claim 1, wherein the fastening element can be positively connected to the inner sleeve.

12. The impression post according to claim 1, wherein the fastening element has a driving element which is adapted to cooperate with a corresponding driving counter element on the inner sleeve in such a way as to drive the inner sleeve during displacement of the fastening element in the direction away from the dental implant.

13. The impression post as claimed in claim 12, wherein the fastening element is a cylindrical screw having an outer collar arranged between the screw head and the screw thread, which is adapted to cooperate with a corresponding inner collar of the inner sleeve so as to drive the inner sleeve when the screw is displaced in the direction away from the dental implant.

14. The impression post according to claim 1, having a cylindrical sleeve cap which can be fitted onto the pair of sleeves in such a way that a preferably annular apical planar face comes to rest on a corresponding planar face of the pair of sleeves.

15. The impression post according to claim 1, wherein the inner sleeve and/or the fastening element has a marking which enables checking the correct position of the impression post to the dental implant.

16. A dental implant with an impression post according to claim 1, which has a preferably annular occlusal planar end face which, when the pair of sleeves is attached to the dental implant, comes to rest on a corresponding preferably terminal planar end face of the outer sleeve of the pair of sleeves.

17. A method for taking an impression of a dental implant with at least one impression post according to claim 1, wherein at least one impression post (10) is fixedly fastened by a respective fastening element (70) to a respective dental implant arranged in the jaw, the at least one impression post (10) and the tissue and denture structures surrounding it in each case are formed with an impression material arranged in an open tray, the respective fastening element (70) is released, optionally, the respective fastening element (70) and the inner sleeve (50) can be removed from the impression material, and the open tray having the outer sleeve (30) surrounded by the impression material and the structures impressed in the impression material is separated from the dental implant.

18. Use of the impression post according to claim 1 for open tray impressions.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0052] FIG. 1 on the left, a schematic plan view of an inventive impression post 10 with outer sleeve 30, inner sleeve 50 and fastening element 70 as well as in FIG. 1 on the right a cross-section of the inventive impression post along the sectional plane A-A;

[0053] FIG. 2 on the top a schematic plan view of the outer sleeve 30, therebelow a top view of the outer sleeve according to the invention from above and therebelow a top view of the outer sleeve according to the invention from below;

[0054] FIG. 3 on the top an inventive inner sleeve 50 in schematic plan view, therebelow in top view from above, therebelow in top view from below on the inventive inner sleeve;

[0055] FIG. 4 above a schematic plan view of the fastening element in accordance with the invention, therebelow a top view of the fastening element from above, therebelow a top view of the fastening element from below, and

[0056] FIG. 5 on the left, a schematic plan view of an inventive sleeve cap 90, including a plan view of the inventive sleeve cap from above and below a plan view of the inventive sleeve cap from below, and a cross-section of the inventive sleeve cap along the section plane A-A in FIG. 5 on the right.

DETAILED DESCRIPTION OF THE INVENTION

[0057] As shown in FIG. 1, the inventive impression post 10 comprises a pair of sleeves with an outer sleeve 30 and an inner sleeve 50 with a substantially hollow cylindrical recess extending axially to the pair of sleeves and a fastening element 70 arranged in the recess, generally in the form of a screw.

[0058] The pair of sleeves comprises a radially internal inner sleeve 50 and a radially external outer sleeve 30 arranged coaxially to this, so that the inner sleeve 50 is arranged between the outer sleeve 30 and the fastening element 70.

[0059] As can be seen in FIG. 2, the essentially hollow cylindrical outer sleeve 30 has flattenings 32 at its circumference and annular recesses 34, which serve to profile the anchorage of the outer sleeve in the impression material. The purpose of the profile designed in this way is to ensure a tight fit between the outer sleeve 30 and the impression material during impression taking. As shown in the middle picture of FIG. 2, the outer sleeve is provided at its upper end with a, for example trigonal, recess 38 occlusal above an inner collar 40, which allows a relative rotational fixation of outer sleeve 30 and inner sleeve 50 to each other.

[0060] In the plan view from below shown in FIG. 2, the lower planar end face 36 is shown at the lower end of the outer sleeve 30, which is supported on a corresponding planar end face on the dental implant, which is not shown, when the impression posts are fixed on the dental implant. The planar end face 36 can also be created from several partial planar end faces on corresponding partial planar end faces on the dental implant, which is not shown. These partial planar end faces can also lie at different levels in the axial direction, provided that the radial displaceability is not impaired when the outer sleeve 30 is removed from the dental implant.

[0061] The inner sleeve 50 shown in FIG. 3 above has a sleeve head 52, a hollow cylindrical middle section 56, an adjoining anti-rotation lock section 58 and a guide section 54, the latter being engageable with a corresponding guide section in the dental implant. The sleeve head 52 preferably has a marking, for example a circumferential groove or profile, which is covered by the recess 38 when the inner sleeve is in the correct vertical position in the impression position.

[0062] In the middle picture of FIG. 3, the inventive inner sleeve 50 is shown in a top view from above. The through bore 64 and the exemplary trigonal/trilobal shape of the sleeve head 52 are shown in plan view. The trigonal/trilobal shape of the sleeve head 52, which can also be designed as a hex or similar, is adapted to a corresponding, e.g. trigonal/trigonal, recess 38 of the outer sleeve 30 in such a way that the outer sleeve 30 and the inner sleeve 50 are secured against rotation with respect to each other when the impression posts 10 are fixed to the dental implant. A shoulder 66 comes into contact with the inner collar 40 of the outer sleeve.

[0063] The sleeve head 52 is preferably axially dimensioned in such a way, that the sleeve head 52 protrudes axially occlusal from the recess 38, for example trigonal/trilobal, of the outer sleeve 30. The upper edge of the sleeve head is chamfered at each of the three bulges to a chamfer section 68, i.e. three chamfer sections 68 in total, which rest against the cone collar 94 of the inner sleeve cap 90.

[0064] In the through bore 64, a driving section, for example in the form of an internal thread, can be arranged above the anti-rotation lock section 58 in such a way that after the fastening element has been unscrewed from the dental implant, the connection between impression post and dental implant is loosened and the fastening element with the threaded section 76 rests on the driving section and thus can allow the internal sleeve to be pulled out of the external sleeve in the occlusal direction.

[0065] The plan view of the inventive inner sleeve 50 from below, shown in FIG. 3 below, shows the anti-rotation lock of the inner sleeve 50 with respect to the dental implant, which in the shown embodiment comprises outer polygonal faces 60 as well as grooves 62, which can interact with corresponding inner polygonal faces and tongues of the tongue-and-groove connection on the not shown dental implant in an anti-rotation manner.

[0066] Although the tongue-and-groove connection elements and/or inner polygons/outer polygonsanti-rotation lock elements pair arranged in the anti-rotation lock section 58 may each be used to provide anti-rotation lock between the inner sleeve and the dental implant, it is preferred, that at least inner polygon-outer polygon face pairs are used between inner sleeve and dental implant so that the tongue-and-groove connecting elements used for the alignment of the abutment are not damaged during the alignment of an abutment which is used in the course of the further dental prosthesis treatment.

[0067] The fastening element 70 shown in FIG. 4 is formed in the shown embodiment in the form of a cylindrical screw with an upper occlusal section 72 of larger diameter, which can also be described as the screw head, and with a lower section 74 of smaller diameter than the screw head 72 and with an apically arranged external thread 76. Between the screw head 72 and the lower section 74, an outer collar 78 is formed in the transition area, which comes into contact with an inner collar 40 in the through bore 64 of the inner sleeve when the fastening element 70 is screwed into the dental implant and takes the outer sleeve 30 with it via the inner sleeve 50, thus securing the impression post 10 in position on the not shown dental implant. The outer collar 78 acts on the outer sleeve 30 via the sleeve head 52 arranged occlusally on the inner sleeve 50 and presses the planar end face 36 onto the corresponding planar end face of the not shown dental implant and fixes the impression post 10 in a secure position. The occlusal end of the fastening element preferably has a marking, for example a circumferential groove or profile, which is covered by the sleeve head 52 of the inner sleeve 50 when the fastening element is in the correct vertical position in the impression position.

[0068] The sleeve cap 90 shown in FIG. 5 is designed, for example, as an equiradial cylinder and can be attached to the pair of sleeves to prevent the penetration of the impression material and the inclusion of the inner sleeve 50 and the fastening element 70 in the impression material. The sleeve cap 90 has an axial bore 92 in the lower section facing the pair of sleeves, which can also be designed as a through bore and which can taper occlusally to a bore 96 by forming an inner collar 94. With the annular face 98, the sleeve cap 90 comes into contact with the occlusal end face 42 of the outer sleeve when it is attached to the pair of sleeves on the occlusal end face 42 of the outer sleeve.

[0069] When using the inventive impression post, it is anchored in the dental implant to be formed, whereby the pair of sleeves is fastened with the fastening element. The stop face 36 of the outer sleeve is brought into contact with the counter stop face of the dental implant. The fastening element 70 is usually tightened by hand, usually with the aid of an Allen key, which is inserted into the Allen opening 80. After the sleeve cap has been attached to the sleeve pair, an impression is taken using the impression tray filled with impression material.

[0070] After the impression material has hardened, the sleeve cap 90 is first removed, whereby profiling 100 facilitates the removal. The fastening element is then usually loosened using an Allen key. The fastening element detached from the internal thread section of the dental implant can be moved axially occlusally with the internal sleeve, whereby the external threaded section 76 functions as a driving element and the internal thread of the internal sleeve 50 functions as a driving counter element.

[0071] After the impression material has cured, the impression tray with the impression material with the outer sleeve 30 embedded in it can be lifted off the dental implant and the outer sleeve connected to a dental implant analog. The resulting structure can then be used to produce a master model.

REFERENCE SIGN LIST

[0072] impression post 10

[0073] outer sleeve 30

[0074] flattening portion 32

[0075] annular recess 34

[0076] planar end face 36

[0077] trigonal recess 38

[0078] inner collar 40

[0079] occlusal end face 42

[0080] inner sleeve 50

[0081] sleeve head 52

[0082] guide section 54

[0083] middle section 56

[0084] anti-rotation lock section 58

[0085] outer polygons 60

[0086] grooves 62

[0087] through bore 64

[0088] shoulder 66

[0089] chamfer section 68

[0090] fastening element 70

[0091] screw head 72

[0092] lower section 74

[0093] external threads 76

[0094] outer collar 78

[0095] sleeve cap 90

[0096] bore 92

[0097] inner collar 94

[0098] bore 96

[0099] annular face 98

[0100] profiling section 100