Patent ID: 8097077

Claim:
A pressable glass-ceramic composition for dental purposes comprising: ZrO 2 40-70 wt. %; SiO 2 17-59 wt. %; Al 2 O 3 2-15 wt. %; Y 2 O 3 0-6 wt. %; K 2 O 3-12.5 wt. %; Na 2 O 0.2-8.5 wt. %; Li 2 O 0-1.5 wt. %; CaO 0.3-2 wt. %; B 2 O 3 0.1-5 wt. %; F 0-2.5 wt. %; CeO 2 0.2-2 wt. %; and TiO 2 0-1.5 wt. %; and being pressable in a dental furnace at a temperature of 880 to 1200° C.