| abstract |
A dental zirconia ceramic that exhibits opalescence, has a particle size in the range of 10 nm to 300 nm, a density of at least 99.5% of theoretical density, a visible light transmission of 45% or more at 560 nm, and an intensity of at least 800 MPa. Such dental zirconia ceramic provides a zirconia green blank having zirconia nanoparticles having an average particle size of less than 20 nm; forming the zirconia green blank by CAD / CAM, LPIM, or dental hot press; Or heating the zirconia green blank to form a brown blank and molding the brown blank by CAD / CAM machining; forming the zirconia to provide an opalescent sintered zirconia body; Sintering a green blank or the brown blank at 1200 ° C. or lower. |