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

• US 8,899,981 B2
• Filed: 08/27/2013
• Issued: 12/02/2014
• 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 Scott, Bassett, Jeffrey, Cahill, Sean
• Primary Examiner(s): LEWIS, RALPH A
• Application Number:
  US14/010,634
• Publication Number:
  US 20130344457A1
• Time in Patent Office: 462 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 including;

a core formed from a biocompatible material, the core defining a coronally accessible internal bore having an internally threaded surface for connection to a separate abutment;

a reinforcing collar integral with the core, the reinforcing collar formed from the biocompatible material and configured for receiving mastication forces, the reinforcing collar defining an opening of the coronally accessible internal bore; and

a porous metal layer including a first porous metal formed on at least a portion of the core for engaging bone, the porous metal layer having an outer apical to coronal height of about 4 mm to about 6 mm and defining a body outer diameter of about 4 mm to about 6 mm, wherein the first porous metal and the biocompatible material comprise different materials.

2. The dental implant of claim 1, wherein the outer apical to coronal height and the body outer diameter are approximately the same.

3. The dental implant of claim 1, wherein the outer apical to coronal height and body outer diameter are both approximately 6 mm.

4. The dental implant of claim 1, wherein the porous metal layer covers a majority of the body.

5. The dental implant of claim 1, wherein the implant generally defines a full circumference, and wherein the porous metal layer covers less than the full circumference of the implant.

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

7. The dental implant of claim 1, wherein the porous metal layer forms a sleeve covering the core.

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

9. The dental implant of claim 1, wherein the body further comprises a head portion with an abutment interface for connection to the separate abutment.

10. The dental implant of claim 9, wherein the abutment interface includes an anti-rotational surface.

11. The dental implant of claim 1, wherein the internally threaded surface of the bore is formed at least partially from a second porous metal.

12. 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.

13. The dental implant of claim 12, wherein the exterior surface forms an array of outwardly extending ribs generally around the reinforcing collar.

14. The dental implant of claim 1, wherein the biocompatible material includes titanium.

15. The dental implant of claim 1, wherein at least a portion of the porous metal layer forms threads for engaging bone.

16. The dental implant of claim 15, wherein the implant can be press-fit into the bone.

17. 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 core having a coronal end including a polygonal shaped anti-rotational interface defining an opening, the opening providing access to an internally threaded axially extending bore for connection to a separate abutment, and

wherein the coronal end includes a reinforcing collar integrally formed with the core, the reinforcing collar made of a biocompatible material different than that of the porous tantalum portion and configured for receiving mastication forces.