ZIRCONIA SINTERED BODY, ZIRCONIA COMPOSITION AND ZIRCONIA CALCINED BODY, AND PROSTHESIS FOR DENTISTRY

摘要

PROBLEM TO BE SOLVED: To provide a zirconia sintered body which suppresses distorted shrinkage deformation.SOLUTION: A plurality of zirconia powder which contains zirconia and a stabilizer and has different compositions is formed and laminated to form a zirconia composition, which is fired at 800°C-1,200°C to produce a zirconia calcined body 20. The zirconia calcined body 20 is molded into a rectangular parallelepiped having a width of 50 mm, a height of 10 mm and a depth of 5 mm to prepare a test piece. In the test piece, when the surface of a width of 50 mm and a depth of 5 mm is a bottom face, a boundary surface formed by laminating the zirconia powder is parallel to the bottoms surface. The test piece is fired at 1,500°C for two hours, and a bottom face 20a of two bottom faces that is deformed in a concave surface is set downward. The zirconia calcined body, in which a ratio of (maximum space between concave bottom face and contact surface) d/(distance between contact parts in width direction) L×100 is 0.15 or less, is fired at 1,400-1,600°C to obtain a zirconia sintered body.SELECTED DRAWING: Figure 3