Biocompatible, low modulus dental devices

• US 5,573,401 A
• Filed: 06/16/1994
• Issued: 11/12/1996
• Est. Priority Date: 12/21/1989
• Status: Expired due to Term

• Current Assignee: Smith & Nephew Richards Incorporated (Smith & Nephew PLC)
• Original Assignee: Smith & Nephew Richards Incorporated (Smith & Nephew PLC)
• Inventors: Kovacs, Paul, Davidson, James A., Mishra, Ajit K., Daigle, Kenneth P.
• Primary Examiner(s): Bennett, Christopher A.
• Application Number:
  US08/260,707
• Time in Patent Office: 880 Days
• Field of Search: 433/1-23, 433/173, 433/174, 433/176, 433/201.1, 433/202.1, 433/228.1
• US Class Current: 433/201.1
• CPC Class Codes: A61C 7/12 Brackets; Arch wires; Combinations thereof; Accessories therefor
• CPC Class Codes: A61C 7/282 Buccal tubes
• CPC Class Codes: A61C 8/0012 characterised by the material or composition, e.g. ceramics, surface layer, metal alloy use of specific materials A61K6/00
• CPC Class Codes: A61C 8/0013 with a surface layer, coating
• CPC Class Codes: A61F 2/0077 Special surfaces of prostheses, e.g. for improving ingrowth A61F2/30767 takes precedence
• CPC Class Codes: A61K 6/818 comprising zirconium oxide
• CPC Class Codes: A61K 6/84 comprising metals or alloys
• CPC Class Codes: A61L 2430/12 for dental implants or prostheses
• CPC Class Codes: A61L 27/06 Titanium or titanium alloys
• CPC Class Codes: A61L 27/507 for artificial blood vessels apparatus for applying cells on a blood vessel prosthesis A61F2/062
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61L 33/022 Metal or alloys
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence
• CPC Class Codes: A61N 1/056 Transvascular endocardial electrode systems
• CPC Class Codes: C22C 14/00 Alloys based on titanium

Abstract

The invention provides dental devices (including implants, abutments, bridges, screws, and orthodontic appliances) that are fabricated from low modulus, biocompatible, non-toxic Ti-Nb-Zr alloys. The dental implants provide a biomaterial-to-bone interface that results in significant attachment between implant and bone. The implants may be supplied with a porous coating or macro-texture to further promote bone attachment and stabilization of the implant in the jaw bone. Other orthodontic appliances such as brackets and wires have improved elastic toughness and corrosion resistance so that they provide superior performance and corrosion characteristics.

Claims

1. A low modulus, corrosion resistant dental implant, said implant comprising:

an implant body shaped for implantation beneath gingival tissue of a mouth, cooperation with a jaw bone, and stable fixation relative to said jaw bone, the implant body made of a predominantly alpha-prime hexagonal close packed titanium alloy comprising;

titanium;

from about 10 to about 20 wt. % as the sum of metals selected from the group consisting of niobium and tantalum; and

up to 50 wt. % zirconium,

wherein the alloy is free from deliberately added toxic elements.

2. The dental implant of claim 1, wherein the implant body is an endosteal implant for insertion into a cavity in the jaw bone.

3. The dental implant of claim 1, wherein the implant body is a subperiosteal implant cooperating with outer surfaces of the jaw bone.

4. The implant of claim 1 further comprising a crown, shaped as a tooth-substitute for fixed attachment relative to the implant body, for projecting above a gumline, said crown comprising:

titanium;

from about 10 to about 20 wt. % as the sum of metals selected from the group consisting of niobium and tantalum; and

up to 50 wt. % zirconium.

5. The implant of claim 4, wherein the crown is at least in part made of an alloy that comprises:

titanium, from about 10 to about 20 wt. % niobium, and less than about 20 wt. % zirconium.

6. The implant of claim 1 further comprising an abutment at least partially implanted in the jaw bone, the abutment fabricated from an alloy comprising:

titanium;

from about 10 to about 20 wt. % as the sum of metals selected from the group consisting of niobium and tantalum; and

up to 50 wt. % zirconium.

7. The implant of claim 1 further comprising a bridge construct adapted for protruding above a gumline, said construct comprising an alloy comprising:

titanium;

from about 10 to about 20 wt. % as the sum of metals selected from the group consisting of niobium and tantalum;

and up to 50 wt. % zirconium.

8. The implant of claim 1 further comprising an abutment screw for attaching an abutment or dental bridge to the implant body, the screw comprising:

titanium;

from about 10 to about 20 wt. % as the sum of metals selected from the group consisting of niobium and tantalum;

and up to 50 wt. % zirconium.

9. The implant of claim 1 further comprising a macro-textured surface coating at least partially covering outer surfaces of said implant body, said macro-textured surface coating adapted for improving attachment of bony tissue with the outer surfaces.

10. The implant of claim 1 further comprising a coating over at least exposed surfaces of the implant projecting above a gumline to simulate appearance of natural tooth or gold.

11. The implant of claim 1 wherein the alloy is cold worked from about 30 to about 90%.

12. The implant of claim 1 wherein the alloy comprises from about 10 wt. % to about 20 wt. % niobium.

13. The implant of claim 1 further comprising a porous surface coating at least partially covering outer surfaces of said implant body, said porous surface coating adapted for improving attachment of bony tissue with the outer surfaces.

14. A dental device adapted for exposure to corrosive fluids in a mouth of a human, said dental device made from a predominantly alpha-prime hexagonal close packed titanium alloy comprising:

titanium;

from about 10 to about 20 wt. % as the sum of metals selected from the group consisting of tantalum and niobium; and

up to 50 wt. % zirconium;

the dental device remaining in the mouth for a predetermined period of time without release of toxic ions into the mouth, the device having a low modulus of elasticity and

wherein the alloy is free from deliberately added toxic elements.

15. The device of claim 14, wherein the device is a dental bracket for attaching to a tooth and for engagement with an orthodontic wire, and wherein said alloy comprises:

titanium, from about 10 to about 20 wt. % niobium, and less than about 20 wt. % zirconium.

16. The device of claim 14 wherein the device comprises an orthodontic wire for attachment to dental brackets, the dental wire having a spring-back ratio of greater than about 2.0.

17. The device of claim 14 wherein the device comprises a buccal tube for use in orthodontics in conjunction with an orthodontic wire, the buccal tube comprising a portion for engaging an orthodontic wire when the buccal tube is attached to a tooth so that the wire exerts a force upon teeth.

37. The device of claim 14 wherein the device is an abutment screw for clamping an abutment to a jawbone implant.

38. The device of claim 14 wherein the device is an abutment for affixing to a jawbone implant.

39. The dental device of claim 14, wherein the alloy is cold worked from about 30% to about 90%.

18. A low modulus, corrosion resistant dental implant, said implant comprising:

an implant body shaped for implantation beneath gingival tissue of a mouth, cooperation with a jaw bone, and stable fixation relative to said jaw bone, the implant body made of a predominantly alpha-prime hexagonal close packed titanium alloy comprising;

titanium;

from about 35 to about 50 wt. % as the sum of metals selected from the group consisting of niobium and tantalum; and

up to 50 wt % zirconium.

wherein the alloy is free from deliberately added toxic elements.

19. The dental implant of claim 18, wherein the implant body is an endosteal implant for insertion into a cavity in the jaw bone.

20. The dental implant of claim 18, wherein the implant body is a subperiosteal implant cooperating with outer surfaces of the jaw bone.

21. The implant of claim 18 further comprising a crown, shaped as a tooth-substitute for fixed attachment relative to the implant body and for projecting above a gumline, said crown comprising:

titanium;

from about 35 to about 50 wt. % as the sum of metals selected from the group consisting of niobium and tantalum; and

up to 50 wt. % zirconium.

22. The implant of claim 21, wherein the crown is at least in part made of an alloy that comprises:

titanium, from about 35 to about 50 wt. % niobium, and less than about 20 wt. % zirconium.

23. The implant of claim 18 further comprising an abutment at least partially implanted in the jaw bone, the abutment fabricated from an alloy comprising:

titanium;

from about 35 to about 50 wt. % as the sum of metals selected from the group consisting of niobium and tantalum; and

up to 50 wt. % zirconium.

24. The implant of claim 18 further comprising a bridge construct protruding above a gumline, said construct comprising an alloy comprising:

titanium;

from about 35 to about 50 wt. % as the sum of metals selected from the group consisting of niobium and tantalum; and

up to 50 wt. % zirconium.

25. The implant of claim 18 further comprising an abutment screw for attaching an abutment or dental bridge to the implant body, the screw comprising:

titanium;

from about 35 to about 50 wt. % as the sum of metals selected from the group consisting of niobium and tantalum; and

up to 50 wt. % zirconium.

26. The implant of claim 18 further comprising a macro-textured surface coating at least partially covering outer surfaces of said implant body, said macro-textured surface coating adapted for improving attachment of bony tissue with the outer surfaces.

27. The implant of claim 18 further comprising a coating over at least exposed surfaces of the implant projecting above a gumline to simulate appearance of natural tooth or gold.

28. The implant of claim 18 wherein the alloy is cold worked from about 30 to about 90%.

29. The implant of claim 18 wherein the alloy comprises from about 35 wt. % to about 50 wt. % niobium.

30. The implant of claim 18 further comprising a porous surface coating at least partially covering outer surfaces of said implant body, said porous surface coating adapted for improving attachment of bony tissue with the outer surfaces.

31. A dental device adapted for exposure to corrosive fluids in a mouth of a human, said device made from a predominantly alpha-prime hexagonal close packed titanium alloy comprising:

titanium;

from about 35 to about 50 wt. % as the sum of metals selected from the group consisting of tantalum and niobium; and

up to 50 wt. % zirconium;

the dental device remaining in the mouth for a predetermined period of time without release of toxic ions into the mouth, the device having a low modulus of elasticity and

wherein the alloy is free from deliberately added toxic elements.

32. The device of claim 31, wherein the device is a dental bracket for attaching to a tooth and for engagement with an orthodontic wire, and wherein said alloy comprises:

titanium, from about 35 to about 50 wt. % niobium, and less than about 20 wt. % zirconium.

33. The device of claim 31 wherein the device comprises an orthodontic wire for attachment to dental brackets, the dental wire having a spring-back ratio of greater than about 2.0.

34. The device of claim 31 wherein the device comprises a buccal tube for use in orthodontics in conjunction with an orthodontic wire, the buccal tube comprising a portion for engaging an orthodontic wire when the buccal tube is attached to a tooth so that the wire exerts a force upon teeth.

35. The device of claim 31 wherein the device is an abutment screw for clamping an abutment to a jawbone implant.

36. The device of claim 31 wherein the device is an abutment for affixing to a jawbone implant.

40. The dental device of claim 31, wherein the alloy is cold worked from about 30% to about 90%.