Gradient composition zirconia dental materials
AssigneeIvoclar Vivadent AG
InventorsJörg Reinshagen, Henning Meyhöfer, Frank Rothbrust
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Abstract
Provided are pre-sintered and sintered zirconia dental ceramic materials. The materials have a gradient in yttria content. The materials may have a gradient in one or more physical/mechanical property and/or one or more optical property. The materials may be made by mixing at least two zirconia ceramic powders having different yttria content. A sintered zirconia dental ceramic material may be in the form of a dental article.
Claims33
A pre-sintered zirconia dental ceramic material having a linear gradient or non-linear gradient that is continuous and uninterrupted in yttria content in at least a portion or all of the pre-sintered zirconia dental ceramic material, wherein the gradient is defined by the following equation:
- y=ax+b, wherein a is 0.05 to 3, and b is −50 to 10 or
- y=−0.0167x3+0.5286x2−5.0119x+17.44, wherein y is the yttria content.
Dependencies are inferred from the claim text.