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US 12,686,641 B2Granted
Method and composition to produce high translucency dental ceramics
AssigneeJames R. Glidewell Dental Ceramics, Inc.
InventorsMay Yun Hsuan Lin, Yan Yang, Sreeram Balasubramanian, Hugo Gonzalez, Dimple Pradhan
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Abstract
Translucency of a yttria-stabilized zirconia ceramic is improved to achieve even higher translucency than what is currently offered on the market, without greatly altering its mechanical properties. The enhancement is done by incorporating magnesium-containing dopants into the microstructure of yttria-stabilized zirconia ceramic dental ceramics.
Claims11
A material comprising:
- a sintered yttria-stabilized zirconia ceramic, stabilized by 4.5 mol % to 6 mol % yttria, wherein the sintered ceramic has a transmittance of 65% to 70% at 700 nm (when measured on a 1 mm thick fully sintered ceramic body), an average grain size of less than 6 μm, a fracture toughness greater than 1.5 MPa·m1/2, and a cubic phase of 40% to 50%, and wherein the sintered ceramic comprises 0.1 wt % to 2 wt % MgO.
Dependencies are inferred from the claim text.