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US 6,280,863 B1Granted
Translucent apatite glass ceramic
AssigneeIvoclar AG
InventorsMartin Frank, Helga Drescher, Wolfram Höland, Volker Rheinberger
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Abstract
An apatite glass ceramic is described which is characterized by good chemical stability, a low expansion coefficient and high translucence, and is particularly suitable, by itself or together with glasses or other glass ceramics, as a veneering material for ceramic dental restorations.
Claims28
Translucent needle-shaped apatite glass ceramic, which comprises the following components:
- Component Wt. % SiO2 45.0 to 70.0 Al2O3 5.0 to 22.0 P2O5 0.5 to 6.5 K2O 3.0 to 8.5 Na2O 4.0 to 13.0 CaO 1.5 to 11.0 F 0.1 to 2.5
- and wherein the main crystal phase is formed by apatite crystals.
Translucent apatite glass ceramic, which comprises the following components:
- Component Wt. % SiO2 50.0 to 68.0 Al2O3 7.0 to 21.0 P2O5 0.5 to 4.0 K2O 4.0 to 8.0 Na2O 4.0 to 11.0 CaO 2.0 to 8.0 F 0.2 to 2.0 B2O3 0.2 to 4.0 La2O3 0 to 3.0 Li2O 0 to 3.0 BaO 0 to 4.0 MgO 0 to 4.0 ZnO 0 to 4.0 SrO 0 to 5.0 TiO2 + ZrO2 0.2 to 5.0 CeO2 0 to 2.0
- and wherein the main crystal phase is formed by apatite crystals.
Dependencies are inferred from the claim text.