Low-temperature-sintering potassium-zinc-silicate glass

• US 20020035025A1
• Filed: 06/22/2001
• Published: 03/21/2002
• Est. Priority Date: 06/28/2000
• Status: Active Grant

• Current Assignee: Ivoclar Vivadent AG
• Original Assignee: Ivoclar Vivadent AG
• Inventors: Rheinberger, Volker, Schweiger, Marcel, Holand, Wolfram
• Granted Patent: US 6,626,986 B2
• Time in Patent Office: Days
• US Class Current: 501/72
• CPC Class Codes: A61K 6/16 Refractive index
• CPC Class Codes: A61K 6/17 Particle size
• CPC Class Codes: A61K 6/20 Protective coatings for natural or artificial teeth, e.g. sealings, dye coatings or varnish
• CPC Class Codes: A61K 6/75 Apatite
• CPC Class Codes: A61K 6/78 Pigments
• CPC Class Codes: A61K 6/807 comprising magnesium oxide
• CPC Class Codes: A61K 6/816 comprising titanium oxide
• CPC Class Codes: A61K 6/822 comprising rare earth metal oxides
• CPC Class Codes: A61K 6/824 comprising transition metal oxides
• CPC Class Codes: A61K 6/833 Glass-ceramic composites
• CPC Class Codes: A61K 6/836 Glass
• CPC Class Codes: C03C 10/16 Halogen containing crystalline phase
• CPC Class Codes: C03C 3/078 containing an oxide of a divalent metal, e.g. an oxide of zinc
• CPC Class Codes: C03C 3/095 containing rare earths

Abstract

Potassium-zinc-silicate glasses are described which because of their high chemical stability as well as their optical properties and favorable working properties are suitable in particular as coating or veneering materials for ceramic dental suprastructures and thus for the preparation of all-ceramic dental restorations, such as crowns or bridges.

Claims

1. Low-temperature-sintering potassium-zinc-silicate glass, which comprises the following components:

2. Glass according to claim 1, which additionally comprises at least one of the following components:

3. Glass according to claim 1 or 2, wherein the amounts of some components are independently of each other as follows:

4. Glass according to any one of claims 1 to 3, wherein the amounts of some components are independently of each other and as follows:

5. Glass according to any one of claims 1 to 4, which does not crystallize during thermal treatment in the range of 600°

C. to 800°

C. for 1 minute to 1 hour.

6. Glass according to any one of claims 1 to 5, which has a sintering temperature of less than 800°

C. and in particular of 760°

C. or less.

7. Glass according to any one of claims 1 to 6, which has a linear thermal coefficient of expansion of less than 12.3×

10<sup>−

6</sup> K<sup>−

1</sup>, measured in the range of 100°

C. to 400°

C.

8. Dental material, which comprises the glass according to any one of claims 1 to 7.

9. Dental material according to claim 8, which additionally comprises an apatite glass ceramic.

10. Dental material according to claim 9 or 10, wherein the apatite glass ceramic comprises the following components and the main crystal phase is formed by apatite crystals:

11. Dental material according to any one of claims 8 to 10, which has a sintering temperature of less than 800°

C. and in particular of 760°

C. or less.

12. Use of the dental material according to any one of claims 8 to 12 for coating a substrate and in particular a dental restoration.

13. Use according to claim 13, wherein the dental material is applied to the substrate, optionally shaped in the desired manner, and then sintered, in order to produce a coating adhering firmly to the substrate.

14. Use according to claim 12 or 13, wherein a substrate is used which is based on ceramic or glass ceramic material.

15. Use according to claim 14, wherein the glass ceramic material is a lithium disilicate glass ceramic which comprises the following components:

16. Use according to any one of claims 13 to 15, wherein the dental material is applied to the substrate and sintered at temperatures of less than 800°

C.

17. Shaped dental product, which comprises potassium-zinc-silicate glass according to any of claims 1 to 7 or the dental material according to any one of claims 8 to 11.

18. Shaped dental product according to claim 17, which is a dental restoration.

19. Shaped dental product according to claim 17 or 18, which has a core based on ceramic or glass ceramic material and a coating applied to it which comprises the potassium-zinc-silicate glass.

20. Shaped dental product according to claim 19, wherein the glass ceramic material is a lithium disilicate glass ceramic.