Body made of a ceramic material

Patent metadata

Field	Value
Publication number	US-10759706-B2
Application number	US-201314654567-A
Country	US
Kind code	B2
Filing date	Dec 23, 2013
Priority date	Dec 24, 2012
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A body made of a ceramic material having a surface region extending from the surface of the body to a predetermined depth and a core region being integrally formed with the surface region. The ceramic material in the surface region includes a calcium containing crystalline phase.

First claim

The invention claimed is:

1. A body made of a ceramic material comprising zirconia and having a surface region extending from the surface of the body to a predetermined depth and a core region being integrally formed with the surface region,
wherein the ceramic material in the surface region comprises a calcium containing crystalline phase and an yttrium or yttria stabilizing agent, which is obtained by depositing calcium carbonate as a calcium component and the yttrium or yttria stabilizing agent in one step on a surface of the ceramic material and thermally treating the ceramic material thereby causing co-diffusion of the calcium component and the stabilizing agent,
wherein the body is an implant or an abutment for an implant, and
wherein a proportion of calcium of the ceramic material decreases continuously in a direction from the surface of the body to the core region, and
wherein said thermal treatment is carried out for a temperature and time sufficient to result in a normalized atomic concentration of calcium of at least 10% at a depth of 5 μm.

2. The body according to claim 1 , wherein the calcium containing crystalline phase is solely present in the surface region.

3. The body according to claim 1 , wherein the crystal structure of the ceramic material in the surface region is such that the content of monoclinic phase is less than 25%.

4. The body according to claim 1 , wherein the surface region extends from the surface of the body to a depth of at least 5 nm.

5. The body according to claim 1 , wherein the surface region extends from the surface of the body to a depth ranging from 5 nm to 200 μm.

6. The body according to claim 1 , wherein at least a part of the surface of the body has a roughened surface.

7. The body according to claim 1 , wherein the body is made of a ceramic material additionally comprising alumina.

8. The body according to claim 7 , wherein the calcium containing crystalline phase is a Ca—Zr—O phase.

9. The body according to claim 8 , wherein the calcium containing crystalline phase is a CaO—ZrO 2 phase.

10. The body according to claim 1 , wherein the body is made of a ceramic material comprising yttria-stabilized zirconia.

11. The body according to claim 9 wherein the CaO—ZrO 2 phase is selected from the group consisting of a monoclinic CaZr 4 O 9 phase, a cubic CaZrO 3 phase and an orthorhombic CaZrO 3 phase.

12. The body according to claim 11 , wherein the CaO—ZrO 2 phase is an orthorhombic CaZrO 3 phase.

13. The body of claim 1 , wherein the implant or the abutment for an implant is a dental implant, or an abutment for a dental implant.

14. The body of claim 1 , wherein the normalized atomic concentration of calcium is at least 20% at the surface.

15. A process for preparing a body according to claim 1 , said process comprising the steps of
applying the calcium component and the yttrium or yttria stabilizing agent in one step onto the surface of a basic ceramic body; and
thermally treating the basic ceramic body with the calcium component and yttrium or yttria stabilizing agent applied thereon at a temperature of at least 500° C., whereby the calcium component diffuses into the basic ceramic body in an amount sufficient that a calcium containing crystalline phase is formed.

16. The process according to claim 15 , further comprising the step of roughening at least a part of the surface of the basic body by a subtractive treatment before applying the calcium compound.

17. The process according to claim 15 , wherein the subtractive treatment comprises an etching step.

18. The body obtained by the process according to claim 15 .

Assignees

• Straumann Holding Ag

Inventors

• Berner Simon

Classifications

• A61C8/0012 Primary

  characterised by the material or composition, e.g. ceramics, surface layer, metal alloy (use of specific materials A61K6/00) · CPC title

• C04B2235/65

  Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes · CPC title

• C04B2235/9669

  Resistance against chemicals, e.g. against molten glass or molten salts · CPC title

• C04B2235/443

  Nitrates or nitrites · CPC title

• C04B2235/3208

  Calcium oxide or oxide-forming salts thereof, e.g. lime · CPC title