Modified dental implant fixture

• US 6,655,961 B2
• Filed: 12/03/2001
• Issued: 12/02/2003
• Est. Priority Date: 12/03/2001
• Status: Expired due to Term

• Current Assignee: Astra Tech AB
• Original Assignee: Dental Design Consultants, LLC
• Inventors: Cottrell, Richard Day
• Primary Examiner(s): O'Connor, Cary E.
• Application Number:
  US10/011,866
• Publication Number:
  US 20030104337A1
• Time in Patent Office: 729 Days
• Field of Search: 433/172, 433/173, 433/174, 433/175, 433/176
• US Class Current: 433/173
• CPC Class Codes: A61C 8/0018 characterised by the shape
• CPC Class Codes: A61C 8/0025 with multiple threads
• CPC Class Codes: A61C 8/005 Connecting devices for joining an upper structure with an implant member, e.g. spacers
• CPC Class Codes: A61C 8/0069 tapered or conical connection
• CPC Class Codes: A61C 8/0077 with shape following the gingival surface or the bone surface

Abstract

A modified dental implant fixture designed to preserve lingual bone by having the coronal aspect of the implant being compatible with bony anatomy that is higher on the lingual side of the implant surgical site. The implant may be of either the single stage or the two stage design. By modifying the shape of the top of the implant fixture to mimic healing/healed bony anatomy, bone is preserved and bone growth is possibly encourage.

Claims

1. A two-stage dental implant for implanting within a human jawbone, the jawbone having lingual and buccal sides, the implant comprising:

a generally cylindrical longitudinal body having an apical end, a coronal end and an outer surface;

said body having a length defined between said ends on said outer surface; and

said coronal end being contoured such that when positioned within the jawbone, said length is greatest on the generally lingual side and least on the generally buccal side such that said length generally decreases from lingual to buccal.

2. A dental implant as defined in claim 1, wherein said body has a diameter and includes at least one size of grooves around said diameter on at least a portion of said body.

3. A dental implant as defined in claim 2, wherein said grooves are parallel with the contour of said coronal end.

4. A dental implant as defined in claim 2, wherein said grooves are perpendicular to said length of said implant body.

5. A dental implant as defined in claim 4, wherein said grooves on the coronal part of the implant body have multiple leading starting points to allow synchronization with larger apical grooves.

6. A dental implant as defined in claim 1, wherein said coronal end is adapted to accept an abutment.

7. A dental implant as defined in claim 6, wherein said abutment is contoured to generally follow said contour of said coronal end.

8. A dental implant as defined in claim 6, wherein said abutment includes margins adapted to engage an impression cap.

9. A dental implant as defined in claim 6, wherein said abutment extends coronally with off axis angulation.

10. A dental implant as defined in claim 1, wherein said contour is straight.

11. A dental implant as defined in claim 1, wherein said contour is convex.

12. A dental implant fixture as defined in claim 1, wherein said contour is textured.

13. A dental implant as defined in claim 1, wherein said body is widest at said coronal end and narrows to parallel surfaces apically.

14. A two-stage dental implant for implanting within the human jawbone, the jawbone having lingual and buccal sides, the implant comprising:

a generally cylindrical longitudinal body having an apical end, a coronal end and an outer surface;

said body having a bone engaging surface defined between said ends; and

said coronal end being contoured such that when positioned within the jawbone said bone engaging surface is longest/greatest on the generally lingual side and shortest/least on the generally buccal side such that said bone engaging surface decreases from lingual to buccal.

15. a dental implant as defined in claim 14, wherein said coronal end is adapted to accept an abutment.

16. A dental implant as defined in claim 15, wherein said abutment is contoured to generally follow said contour of said end.

17. A dental implant as defined in claim 15, wherein said abutment includes margins adapted to engage an impression cap.

18. A dental implant as defined in claim 14, wherein said abutment extends coronally with off axis angulation.

20. A dental implant as defined in claims 14 or 19, wherein said body has a diameter and includes at least one size of grooves or threads around said diameter on at least a portion of said body.

21. A dental implant as defined in claim 20, wherein said grooves or threads are parallel with and adjacent to the contour of said coronal end.

22. A dental implant as defined in claim 20, wherein said grooves or threads are perpendicular to the long axis of the implant body and adjacent to the contour of said coronal end.

23. A dental implant as defined in claim 22, wherein said grooves on the coronal part of the implant body have multiple leading starting points to allow synchronization with larger apical grooves.

24. A dental implant as defined in claims 14 or 19, wherein grit blasting or other surface texturing designed to promote osseointegration is used on the coronal aspect of all bone engaging surfaces.

27. A dental implant as defined in claims 14 or 19, wherein said coronal contour is straight.

28. A dental implant as defined in claims 14 or 19, wherein said coronal contour is convex.

29. A dental implant as defined in claims 14 or 19, wherein said bone engaging surface is textured.

30. A dental implant as defined in claims 14 or 19, wherein said body is widest at said coronal end and narrows to parallel surfaces apically.

31. A dental implant as defined in claims 14 or 19, wherein said body has threads on the apical portion of said body.

19. A single-stage dental implant for implanting within the human jawbone, the jawbone having lingual and buccal sides, the implant comprising:

a generally cylindrical longitudinal body having an apical end, a coronal end and an outer surface;

said body having a bone engaging surface defined between said ends;

said coronal end being contoured such that the bone engaging surface is prepared to be longest/greatest on the generally lingual side and shortest/least on the generally buccal side such that said bone engaging surface decreases from lingual to buccal when positioned within the jawbone; and

said body also having a non-bone engaging surface extending coronally from said bone engaging surface whereby said non-bone engaging surface when combined with said bone engaging surface is longest/greatest on the lingual side.

25. A dental implant as defined in claim 19, wherein said coronal end is adapted to accept an abutment extending coronally with or without angulation.

26. A dental implant as defined in claim 25, wherein the coronal margin of the implant is adapted to engage an impression cap fitting over the abutment.

32. A dental implant for implanting within the human jawbone, the jawbone having lingual and buccal sides, the implant comprising:

a generally cylindrical longitudinal body having an apical end and a coronal end; and

said body having a bone engaging portion defined between said ends of a defined length, said coronal end of said bone engaging portion having a coronal facing generally asymmetric truncated cylindrical surface such that said bone engaging portion generally decreases in length from lingual to buccal.

33. A dental implant as defined in claim 32, wherein said asymmetrical truncated cylindrical surface has a lingual side surface and a buccal side surface and said defined length between said apical end and said lingual side surface is between around 1 mm to 4 mm longer in length than said defined length between said apical end and said buccal side surface.

34. A dental implant as defined in claim 33, wherein said defined length between said apical end and said lingual side surface is around 2 mm to around 3 mm longer in length than said defined length between said apical end and said buccal side surface.

35. A dental implant as defined in claim 34, wherein said defined length between said apical end and said lingual side surface is around 2 mm longer in length than said defined length between said apical end and said buccal side surface.

36. A dental implant as defined in claim 32, wherein said generally asymmetrical truncated cylindrical surface is contoured.

37. A dental implant as defined in claim 36, wherein said contour is slightly convex.

38. A method for implanting a screw/thread type dental fixture within the human jawbone, the fixture having a coronal end, the method comprising:

determining a correct implant site;

determining a correct physical implant design;

pre-drilling said site for said implant;

determining an approximate number of rotations of said implant for an ideal penetration within the jawbone; and

screwing the implant into the jawbone by rotating said implant said approximate number of rotations, such that said implant achieves said ideal penetration.

39. A method of implanting a screw/thread type dental fixture as defined in claim 38, wherein said ideal penetration is such that the coronal end is flush with the jawbone.

40. A method for implanting a screw/thread type dental fixture as defined in claim 38, wherein said ideal penetration is such that the coronal end is above the jawbone.