Zirconia sintered body, zirconia composition, zirconia pre-sintered body and dental prosthesis
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United States of America Patent
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Sep 1, 2020
Grant Date -
Mar 24, 2016
app pub date -
May 8, 2014
filing date -
May 10, 2013
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Abstract
A zirconia sintered body is provided in which the strength between layers of powders is improved. A flexural strength of a test sample of the zirconia sintered body, measured pursuant to JISR1601, is not less than 1100 MPa. The test sample is formed by preparing a plurality of zirconia powders, each containing zirconia and a stabilizer that suppresses phase transition of zirconia, the zirconia powders differing in a composition, layering the zirconia powders to form a zirconia composition, and sintering the zirconia composition to form a zirconia sintered body. The flexural strength is measured such that a load point is positioned at a boundary of the zirconia powders, the boundary traversing the test sample of the sintered body along a direction of load application.
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