Dental implant for a jaw with reduced bone volume and improved osseointegration features

• US 8,562,346 B2
• Filed: 07/02/2008
• Issued: 10/22/2013
• Est. Priority Date: 08/30/2005
• Status: Active Grant

• Current Assignee: Zimmer Dental Inc. (Zimvie Incorporated)
• Original Assignee: Zimmer Dental Inc. (Zimvie Incorporated)
• Inventors: Collins, Michael, Bassett, Jeffrey A., Cahill, Sean
• Primary Examiner(s): LEWIS, RALPH A
• Application Number:
  US12/167,049
• Publication Number:
  US 20090011384A1
• Time in Patent Office: 1,938 Days
• Field of Search: 433/173, 433/174, 433/175
• US Class Current: 433/173
• CPC Class Codes: A61C 2008/0046 Textured surface, e.g. roughness, microstructure A61C8/0013 takes precedence
• 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: A61C 8/0022 Self-screwing A61C8/0028 takes precedence
• CPC Class Codes: A61C 8/0075 Implant heads specially designed for receiving an upper structure if separable from the implant A61C8/005
• CPC Class Codes: A61K 6/84 comprising metals or alloys

Abstract

A dental implant has a body with a porous metal portion for engaging bone. The porous metal portion has an outer coronal to apical height and an outer diameter. Both the height and diameter are about 4 mm to about 6 mm. This permits the implant to be placed on a jaw with a reduced bone volume.

Claims

1. A dental implant, comprising:

a body having a porous metal portion for engaging bone and a coronal end including a polygonal shaped anti-rotational interface defining an opening configured for receiving an apical end of an abutment, the opening providing access to an internally threaded axially extending bore; and

a reinforcing collar defining a head disposed toward the coronal end, wherein an exterior surface of the reinforcing collar includes an array of outwardly extending ribs elongated axially;

the porous metal portion having an outer apical to coronal height of about 4 mm to about 6 mm and an outer diameter of about 4 mm to about 6 mm wherein the height and diameter are approximately the same to create a short and wide porous metal portion.

2. The dental implant of claim 1, wherein the outer height and the outer diameter are the same.

3. The dental implant of claim 1, wherein the outer height and outer diameter are both approximately 4 mm.

4. The dental implant of claim 1, wherein the porous metal portion forms the entire body.

5. The dental implant of claim 1, wherein the porous metal portion forms a majority of the body.

6. The dental implant of claim 1, wherein the implant generally defines a full circumference, and wherein the porous metal portion forms less than the full circumference of the implant.

7. The dental implant of claim 1, further comprising a resorbable material filling at least a portion of the porous metal portion.

8. The dental implant of claim 1, wherein the body has a core, and the porous metal portion forms a sleeve covering the core.

9. The dental implant of claim 1, wherein the body has at least one longitudinal section entirely formed of porous metal.

10. The dental implant of claim 1, wherein the porous metal includes tantalum.

11. The dental implant of claim 1, wherein the bore is formed by porous metal, and wherein the porous metal forms internal threads for connection to an abutment anchor.

12. The dental implant of claim 1, wherein the reinforcing collar is made of a material different than that of the porous metal and is disposed and configured for receiving mastication forces.

13. The dental implant of claim 12, wherein the reinforcing collar includes titanium.

14. The dental implant of claim 1, wherein the reinforcing collar further comprises a less than entirely smooth exterior surface to promote bone growth against the exterior surface.

15. The dental implant of claim 1, wherein the array of outwardly extending ribs extends around at least a portion of the reinforcing collar and is made of a same material as the core.

16. The dental implant of claim 1, wherein the body has an outer surface formed by the porous metal, at least a portion of the porous metal forming threads for engaging bone.

17. The dental implant of claim 16, wherein the implant can be press-fit into the bone.

18. The dental implant of claim 1, wherein the body further comprises an abutment portion.

19. The dental implant of claim 1, wherein at least one reinforcing member extends through the porous metal portion.

20. The dental implant of claim 19, wherein the reinforcing member extends in a helical arrangement through the porous metal portion.

21. The dental implant of claim 1, wherein the dental implant comprises a single porous metal portion.

22. A prosthetic device, comprising:

a bone-embedded section having a generally porous tantalum portion covering at least an exterior of the bone-embedded section, the porous tantalum portion having an outer height approximately the same as an outer diameter of the porous tantalum portion,

wherein the bone-embedded section includes a coronal end including a polygonal shaped anti-rotational interface defining an opening configured for receiving an apical end of an abutment, the opening providing access to an internally threaded axially extending bore, and

wherein the coronal end includes a reinforcing collar defining a head, an exterior surface of the reinforcing collar including an array of outwardly extending ribs elongated axially.

23. The prosthetic device of claim 22, wherein the bone-embedded section is an endosseous section.

24. The prosthetic device of claim 23, wherein the endosseous section further comprises a core made of a material different from the material forming the porous tantalum portion.

25. A prosthetic device, comprising:

an endosseous section having a generally porous tantalum portion with a porous material and covering at least an exterior of the endosseous section, the porous tantalum portion having an outer height of approximately 4 mm to approximately 6 mm and an outer diameter of approximately 4 mm to approximately 6 mm;

a coronal end of the endosseous section including a polygonal shaped anti-rotational interface defining an opening configured for receiving an apical end of an abutment, the opening providing access to an internally threaded axially extending bore;

a reinforcing collar defining a head disposed toward the coronal end, wherein an exterior surface of the reinforcing collar includes an array of outwardly extending ribs elongated axially; and

at least one reinforcing member that is other than the central core of the prosthetic device and having an outer surface embedded within the porous metal tantalum portion so that the entire outer surface is in contact with the porous material.

26. An implant, comprising:

a body having a porous metal section with porous material for engaging bone and including a coronal end including a polygonal shaped anti-rotational interface defining an opening configured for receiving an apical end of an abutment, the opening providing access to an internally threaded axially extending bore, the coronal end including a reinforcing collar defining a head, wherein an exterior surface of the reinforcing collar includes an array of outwardly extending ribs elongated axially; and

at least one reinforcing bar having an outer surface embedded within the porous metal section so that the entire outer surface is in contact with the porous material and wherein the at least one reinforcing bar is other than a central longitudinal core of the implant.

27. The implant of claim 26, wherein the porous metal section includes tantalum.

28. The implant of claim 26, wherein the at least one reinforcing bar is helical.

29. The implant of claim 26, wherein the body generally defines a longitudinal axis and, wherein the at least one reinforcing bar comprises an elongate body generally defining a longitudinal axis that is not the same as the longitudinal axis of the body.

30. An implant body for engaging bone comprising:

a longitudinal axis and a circumference transversely extending around the longitudinal axis;

a coronal end including a polygonal shaped anti-rotational interface defining an opening configured for receiving an apical end of an abutment, the opening providing access to an internally threaded axially extending bore;

a reinforcing collar disposed toward the coronal end, wherein an exterior surface of the reinforcing collar includes an array of outwardly extending ribs elongated axially;

a plurality of non-porous, radially extending ribs having alternating distal surfaces circumferentially spaced from each other around the circumference; and

at least one porous portion disposed circumferentially between the radially extending ribs around the circumference.

31. The implant of claim 30, further comprising at least two porous portions, and wherein the radially extending ribs entirely separate the porous portions from each other.

32. The implant of claim 30, wherein the at least one porous portion includes tantalum.

33. A dental implant, comprising:

a body having a porous metal portion for engaging bone and a coronal end including a polygonal shaped anti-rotational interface defining an opening configured for receiving an apical end of an abutment, the opening providing access to an internally threaded axially extending bore;

the porous metal portion having an outer apical to coronal height of about 4 mm to about 6 mm and an outer diameter of about 4 mm to about 6 mm wherein the height and diameter are approximately the same to create a short and wide porous metal portion;

wherein at least one reinforcing member extends in a helical arrangement through the porous metal portion.

34. An implant, comprising:

a body having a porous metal section with porous material for engaging bone and including a coronal end including a polygonal shaped anti-rotational interface defining an opening configured for receiving an apical end of an abutment, the opening providing access to an internally threaded axially extending bore, and

at least one helical reinforcing bar having an outer surface embedded within the porous metal section so that the entire outer surface is in contact with the porous material and wherein the at least one helical reinforcing bar is other than a central longitudinal core of the implant.