ZIRCONIA SINTERED BODY, ZIRCONIA COMPOSITION AND ZIRCONIA CALCINED BODY, AND DENTAL PROSTHESIS

摘要

Zirconia sintered body having similar appearance to natural tooth. On straight line extending in first direction from one end to the other end of zirconia sintered body, when chromaticity (L*, a*, b*) by a L*a*b* colorimetric system of first point positioned in section from the one end to 25% of the whole length is (L1, a1, b1) and chromaticity (L*, a*, b*) by L*a*b* colorimetric system of second point positioned in section from the other end to 25% of whole length is (L2, a2, b2), L1 ranges from 58.0 to 76.0, a1 ranges from −1.6 to 7.6, b1 ranges from 5.5 to 26.3, L2 ranges from 71.8 to 84.2, a2 ranges from −2.1 to 1.8, b2 ranges from 1.9 to 16.0, L1a2, b1>b2, and tendency to increase or decrease chromaticity by the L*a*b* colorimetric system from first point to second point does not change.

主权项

1. A zirconia sintered body,
wherein, on a straight line extending in a first direction from one end to the other end, when a chromaticity (L*, a*, b*) by a L*a*b* colorimetric system of a first point positioned in a section from said one end to 25% of a whole length is (L1, a1, b1) and a chromaticity (L*, a*, b*) by the L*a*b* colorimetric system of a second point positioned in a section from said other end to 25% of the whole length, is (L2, a2, b2), L1 ranges from 58.0 to 76.0, a1 ranges from −1.6 to 7.6, b1 ranges from 5.5 to 26.3, L2 ranges from 71.8 to 84.2, a2 ranges from −2.1 to 1.8, b2 ranges from 1.9 to 16.0, L1a2, b1>b2, and a tendency to increase or decrease the chromaticity by the L*a*b* colorimetric system from said first point to said second point does not change.