US Patent 7795164 Dental glass

The present invention relates to a dental glass containing 50 to 70 wt. % of SiO2,5 to 18 wt. % of Al2O3,6.1 to 30 wt. % of MgO,1 to 15 wt. % of La2O3,1 to 15 wt. % of WO3,0.1 to 8 wt. % of ZrO2,and optionally further oxides except for the oxides of Sr, Ba or alkali metals, wherein the stated quantities in total add up to 100 wt. %.