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US 10,703,076 B2Granted
Zirconia composition, zirconia semi-sintered body and zirconia sintered body, as well as dental product
AssigneeKuraray Noritake Dental Inc.
InventorsYoshihisa Ito, Yasutaka Kudo
Life of this patent
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Abstract
A zirconia composition, a zirconia semi-sintered body, a zirconia sintered body, and a dental product are provided. The zirconia sintered body contains 4 mol % to 7 mol % of yttria as stabilizer, and a shielding material. The zirconia sintered body comprises first region and second region having a higher content ratio of the shielding material than the first region. Difference between content ratio of yttria in the first region and that of yttria in the second region is 1 mol % or less.
Claims12
A partially stabilized zirconia sintered body, comprising from 4 mol % to 7 mol % of yttria as a stabilizer,
- wherein
- the zirconia sintered body comprises a light shielding material,
- the zirconia sintered body comprises a first region, and a second region having a higher content ratio of the light shielding material than the first region,
- a difference between a content ratio of yttria in the first region and a content ratio of yttria in the second region is 1 mol % or less,
- a L* value of color degree in a L*a*b* color system measured on white background is defined as a first L* value,
- the L* value of color degree in the L*a*b* color system measured on black background is defined as a second L* value, and
- ΔL of the first region is larger than ΔL of the second region, wherein a value calculated by subtracting the second L* value from the first L* value is defined as ΔL.
4 more elements
Dependencies are inferred from the claim text.