| abstract |
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 9×10 −6 /° C. to about 17.5×10 −6 /° C., and comprises: n n n n n n n n n n n n SiO 2 n 57-67 n n n Al 2 O 3 n 7-15 n n n K 2 O n 7-15 n n n Na 2 O n 6-15 n n n Li 2 O n 0.5-3. |