Lithium disilicate glass ceramics dental product

• US 6,342,458 B1
• Filed: 08/23/1999
• Issued: 01/29/2002
• Est. Priority Date: 09/05/1996
• Status: Expired due to Term

• Current Assignee: Ivoclar AG
• Original Assignee: Ivoclar AG
• Inventors: Rheinberger, Volker, Schweiger, Marcel, Frank, Martin, Hoeland, Wolfram
• Primary Examiner(s): Koslow, C. Melissa
• Application Number:
  US09/379,450
• Time in Patent Office: 890 Days
• Field of Search: 106/35, 501/5, 501/63, 501/64, 501/68, 501/69, 433/218, 433/215, 433/212.1, 433/202.1
• US Class Current: 501/5
• CPC Class Codes: A61K 6/17 Particle size
• CPC Class Codes: A61K 6/78 Pigments
• CPC Class Codes: A61K 6/807 comprising magnesium oxide
• CPC Class Codes: A61K 6/818 comprising zirconium oxide
• CPC Class Codes: A61K 6/824 comprising transition metal oxides
• CPC Class Codes: A61K 6/833 Glass-ceramic composites
• CPC Class Codes: C03C 10/0009 containing silica as main constituent
• CPC Class Codes: C03C 10/0027 containing SiO2, Al2O3, Li2O as main constituents

Abstract

High-strength sinterable lithium disilicate glass ceramics are described which can be further processed in particular by pressing in the viscous state to shaped dental products.

Claims

1. A dental product comprising a lithium disilicate glass ceramic comprising the following components:

2. The dental product according to claim 1, wherein the dental product is translucent.

3. The dental product according to claim 1, wherein the dental product has the color of a natural tooth.

4. The dental product according to claim 1, wherein the dental product has a bending strength of 200 to 400 MPa.

5. The dental product according to claim 1, wherein the dental product has an acid resistance below 75 μ

g/cm².

6. The dental product according to claim 1, wherein the dental product has fracture toughness value of 3 to 4.5 MPam^0.5.

7. The dental product according to claim 1, further comprising a coating.

8. The dental product according to claim 7, wherein the coating is a ceramic, a class ceramic, a glass, a glaze, or a composite.

9. The dental product according to claim 1, wherein the dental product has a dimensional stability at up to 900°

C.

10. The dental product according to claim 1, which is an inlay, an onlay, a bridge, a post construction, a veneer, a crown, or a partial crown.