Selective surface, externally-threaded endosseous dental implant

• US 5,571,017 A
• Filed: 10/05/1994
• Issued: 11/05/1996
• Est. Priority Date: 10/05/1994
• Status: Expired due to Term

• Current Assignee: Centerpulse Orthopedics Incorporated
• Original Assignee: Core-Vent Corporation
• Inventors: Niznick, Gerald A.
• Primary Examiner(s): Bennett, Christopher A.
• Application Number:
  US08/318,231
• Time in Patent Office: 762 Days
• Field of Search: 433/172, 433/173, 433/174, 433/175, 433/176
• US Class Current: 433/174
• CPC Class Codes: A61C 8/0022 Self-screwing A61C8/0028 takes precedence

Abstract

Endosseous dental implants having generally cylindrical-shaped bodies and self-tapping threads at the distal end and, in some case, external threads over a substantial portion of their external surface, include internal or external wrench-engaging surfaces at the proximal end portion and, between the relatively smooth distal and proximal end portions, an external middle region having greater surface roughness than the proximal or distal ends, or a coating, to promote attachment of the implant to bone tissue when the implant is placed in a generally-cylindrical passage formed in bone tissue to receive the implant.

Claims

1. An endosseous dental implant having a generally cylindrical shape and including, at its distal end, self-tapping threads, and at its proximal end, wrench-engaging surfaces for engaging a tool to place said implant in a generally-cylindrical passage formed in the jawbone of a person to receive said implant, said distal end and said proximal end having a roughness of up to about 20 microns measured by the average difference between the peaks and valleys of the surface texturing, and, between said distal and proximal ends, a relatively rough, middle region having a roughness of at least about 25 microns, measured by the average difference between the peaks and valleys of the surface texturing.

2. The dental implant of claim 1 wherein said relatively rough, middle region of the external surface of the implant has randomized surface roughness.

3. The dental implant of claim 1 or claim 2 wherein the distal end of the implant includes at least one through-hole and at least one internal cavity of sufficient size and shape to receive and hold solids and liquids formed by the self-cutting threads as the implant is inserted into said passage.

4. The implant of claim 1 wherein said relatively rough, middle region is HA coated.

5. The implant of claim 1 wherein said relatively rough, middle region is coated with titanium plasma spray.

6. The implant of claim 1 wherein said relatively rough, middle region is formed by grit-blasting.

7. The endosseous dental implant of claim 1 or claim 2 or claim 4 or claim 5 or claim 6 wherein said wrench-engaging surfaces are at the proximal end of said implant and project upwardly from said top end.

8. The endosseous dental implant of claim 1 or claim 2 or claim 4 or claim 5 or claim 6 further comprising a top surface at said proximal end, and an external wall that includes said distal end, said proximal end, and said middle region, and wherein said wrench-engaging surfaces are inside said implant, below the top surface of said implant, and within the external wall of said implant.

23. The dental implant of claim 1 or claim 2 or claim 3 or claim 4 or claim 5 or claim 6 or claim 7 or claim 7 or claim 8 or claim 9 or claim 10 or claim 11 or claim 12 or claim 13 or claim 14 or claim 15 or claim 16 or claim 17 or claim 18 or claim 19 or claim 20 or claim 21 or claim 22 wherein said-middle region is externally-threaded.

9. An endosseous dental implant having a generally cylindrical shape including, at its distal end, self-tapping threads, and at its proximal end, wrench-engaging surfaces adapted to engage a tool to place said implant in a generally-cylindrical passage formed in the jawbone of a person to receive said implant, and, between said distal end and said proximal end, a relatively rough, externally-threaded middle region having a roughness at least about 25 percent greater than the roughness of said distal end and said proximal end, said roughness being measured by the average difference between the peaks and valleys of the surface texturing.

10. The dental implant of claim 9 wherein said relatively rough, middle region of the external surface of the implant has randomized surface roughness.

11. The dental implant of claim 9 or claim 10 wherein the distal end of the implant includes at least one through-hole and at least one internal cavity of sufficient size and shape to receive and hold solids and liquids formed by the self-cutting threads as the implant is inserted into said passage.

12. The implant of claim 9 wherein said relatively rough, middle region is HA coated.

13. The implant of claim 9 wherein said relatively rough, middle region is coated with titanium plasma spray.

14. The implant of claim 9 wherein said relatively rough, middle region is formed by grit-blasting.

15. The endosseous dental implant of claim 9 or claim 10 or claim 12 or claim 13 or claim 14 wherein said distal end and said proximal end have a roughness of up to about 20 microns measured by the average difference between the peaks and valleys of the surface texturing.

16. The endosseous dental implant of claim 9 or claim 10 or claim 12 or claim 13 or claim 14 wherein said wrench-engaging surfaces are at the proximal end of said implant and project upwardly from said proximal end.

17. An endosseous dental implant having a generally cylindrical shape and including, at its distal end, self-tapping threads, and at its proximal end, wrench-engaging surfaces for engaging a tool to place said implant in a generally-cylindrical passage formed in the jawbone of a person to receive said implant, said distal end and said proximal end being uncoated, and, between said distal and said proximal ends, a coated middle region.

18. The dental implant of claim 17 wherein said distal end of the implant includes at least one through-hole and at least one internal cavity of sufficient size and shape to receive and hold solids and liquids formed by the self-cutting threads as the implant is inserted into said passage.

19. The dental implant of claim 17 wherein said middle region is coated with Hydroxylapatite.

20. The dental implant of claim 17 wherein said middle region is coated with Titanium Plasma Spray.

21. The dental implant of claim 17 wherein said wrench-engaging surfaces are at the top end of said implant and project upwardly from said top end.

22. The dental implant of claim 17 further comprising a top surface at said proximal end and an external wall that includes said distal end, said proximal end, and said middle region, and wherein said wrench-engaging surfaces are inside said implant, below the top surface of said implant, and within the external wall of said implant.

24. The dental implant of claim 17 or claim 18 or claim 19 or claim 20 or claim 21 or claim 22 wherein the uncoated portion of said proximal end includes an annular neck region.