Body made of ceramic material

Abstract

Body made of a ceramic material, the body having as an integral part thereof a surface region reaching from the surface of the body down to a predetermined depth. According to the invention, the surface region is enriched with a magnesium component thereby forming a hydrophilic surface area.

Claims

1. An implant system in contact with a bone, the implant system comprising a body made of a ceramic material, wherein the body comprises as an integral part thereof a surface region reaching from a surface of the body down to a predetermined depth; the surface region is enriched with a magnesium component thereby forming a hydrophilic surface area; and the hydrophilic surface area is formed at least on the portion of the body in direct contact with the bone.

2. The implant system according to claim 1, wherein the magnesium component is integrated in the ceramic material of the surface region.

3. The implant system according to claim 1, wherein the magnesium component is magnesium ions or magnesium oxide.

4. The implant system according to claim 1, wherein the surface region reaches down to a depth of 10 μm at most.

5. The implant system according to claim 1, wherein the proportion of the magnesium component increases continuously from the predetermined depth towards the surface of the body.

6. The implant system according to claim 1, wherein the hydrophilic surface area is defined by a contact angle of less than 90°.

7. The implant system according to claim 1, wherein the body is a dental implant.

8. The implant system according to claim 1, wherein the hydrophilic surface area is formed on an entire surface of the body.

9. The implant system according to claim 1, wherein the ceramic material comprises zirconia.

10. The implant system according to claim 9, wherein the ceramic material comprises yttria-stabilized zirconia.

11. The implant system according to claim 1, wherein at least a part of the hydrophilic surface area has a surface roughness obtainable by a surface roughness treatment.

12. An implant system in contact with a soft tissue, the implant system comprising a body made of ceramic material, wherein the body comprises as an integral part thereof a surface region reaching from a surface of the body down to a predetermined depth; the surface region is enriched with a magnesium component thereby forming a hydrophilic surface area; and the hydrophilic surface area is formed at least on the portion of the body in direct contact with the soft tissue.

13. The implant system according to claim 12, wherein the magnesium component is integrated in the ceramic material of the surface region.

14. The implant system according to claim 12, wherein the surface region reaches down to a depth of 10 μm at most.

15. A method for producing the implant system according to claim 1, said method comprising a) applying at least one magnesium compound selected from the group consisting of a magnesium salt, magnesium oxide, magnesium hydroxide, metallic magnesium and a magnesium containing gel onto the surface of a basic ceramic body, and b) thermally treating the basic ceramic body with the magnesium compound applied thereon at a temperature higher than 200° C., whereby a magnesium component based on the magnesium compound diffuses into the ceramic material.

16. The method according to claim 15, wherein the magnesium compound of step a) is selected from the group consisting of MgCO.sub.3, Mg(NO.sub.3).sub.2, MgCl.sub.2, MgSO.sub.4, Mg-acetate, and combinations thereof.

17. The method according to claim 15, wherein after step b) residual magnesium compound is removed from the surface of the body by rinsing with a liquid, air streaming, brushing acid washing or polishing.

18. The method according to claim 17, wherein the liquid used for rinsing is pure water or an aqueous solution.

Description

DETAILED DESCRIPTION

(1) The present invention likewise relates to the use of the body as an abutment for such an implant. All features and advantages mentioned above for an implant, in particular a dental implant, likewise apply to an abutment.

(2) The present invention is further illustrated by way of the following example:

EXAMPLE

(3) Preparation of Samples

(4) Discs of yttria-stabilized zirconia (MZ111 HIP of CeramTec AG) having a machined surface, a thickness of about 1 mm and a diameter of about 5 mm were used.

(5) The discs were cleaned with Deconex 15 PF for 5 minutes using ultra-sound and subjected to a plasma treatment Specifically, the plasma treatment was performed using an apparatus of the type “Femto” (Diener Electronics GmbH+Co. KG, Ebhausen) using the following parameters: power 35 W, 6 sccm oxygen gas flow (sccm: standard cubic centimeter per minute; 1 sccm=1 cm3 per minute at normal pressure, i.e. 1013 mbar), pressure≈0.1 mbar, time 2.5 minutes).

(6) A MgCO.sub.3 slurry prepared by mixing MgCO.sub.3 with water in a weight ratio of 1:1 was applied to the discs in a thickness of about 1 to 2 mm.

(7) The discs with the slurry applied thereon were heated to 1150° C. for 2 hours and then cooled in air. The cooled samples were then rinsed using pure water and dried under a stream of argon.

(8) The chemical composition of the surface and the surface region of the discs were determined using X-ray Photoelectron Spectroscopy (XPS). XPS analysis included determination of the normalised atomic percentage as a function of the depth of the material. To this end, the surface material of the sample was subtracted using an argon sputter gun and XPS spectra were taken at different depths. During sputtering, the samples were rotated in order to allow a homogenous subtraction of the material.

(9) Contact Angles (CA)

(10) For three samples, the contact angles were determined using pure water according to the sessile drop method (Easyl)prop DSA20 E, Krüss GmbH). A drop size of 0.3 μl was chosen. The contact angles were calculated by fitting a circular segment function to the contour of the droplet placed on the surface (“circle fitting method”).

(11) The results of the contact angles as a function of the exposure time to laboratory air are represented below:

(12) TABLE-US-00001 Storage CA [°] of CA [°] of CA [°] of Standard time Sample Sample Sample Mean CA Deviation [days] 1.1 1.2 1.3 [°] CA [°] 0 0.0 0.0 0.0 0.0 0.0 2 35.0 25.8 20.5 27.1 7.3 5 47.4 41.9 39 42.8 4.3 7 49.5 43.8 41.9 45.1 4.0
Chemical Composition

(13) The chemical composition of the disc (i.e. the atomic percentage of the respective elements at a given depth from the surface) as determined by XPS is represented below:

(14) TABLE-US-00002 Depth/[nm] Zr [%] Y [%] C [%] O [%] Al [%] Mg [%] 0 22.8 1.9 11.8 54.7 6.1 2.7 50 38.8 3.0 0.0 54.8 1.8 1.7 100 40.9 3.0 0.0 55.1 0.8 0.3 200 42.0 3.0 1.0 53.8 0.0 0.2 350 42.4 3.1 0.0 53.3 1.0 0.2 500 43.0 3.1 0.0 53.7 0.0 0.2