| 摘要 |
PROBLEM TO BE SOLVED: To provide a zirconia sintered body having an external appearance similar to a natural tooth.SOLUTION: On a straight line extending in a first direction from one end toward other end of a zirconia sintered body, the chromaticity (L,a,b) in the Labcolor system of a first point in the section reaching 25% of the total length from the one end is represented by (L1,a1,b1), and the chromaticity (L,a,b) in the Labcolor system of a second point in the section reaching 25% of the total length from the other end is represented by (L2,a2,b2). In this case, L1 is 58.0 or more and 76.0 or less, a1 is -1.6 or more and 7.6 or less, b1 is 5.5 or more and 26.3 or less, L2 is 71.8 or more and 84.2 or less, a2 is -2.1 or more and 1.8 or less, b2 is 1.9 or more and 16.0 or less, and the following expressions are satisfied: L1<L2, a1>a2, and b1>b2. The increase/decrease tendency of the chromaticity in the Labcolor system is not changed from the first point toward the second point. |
