| 摘要 |
A porcelain blank comprising a porcelain composition for dental restorations comprising a leucite crystallite phase and a glass matrix phase, wherein the leucite crystallites possess diameters not exceeding about 10 micron. Preferably, the porcelain composition has a maturing temperature from about 750° C. to about 1050° C. and a coefficient of thermal expansion from about 9x10-6/° C. to about 17.5x10-6/° C., and comprises: SiO2 57-67 Al2O3 7-15 K2O 7-15 Na2O 6-15 Li2O 0.5-3.
|
