High zirconia containing glass ceramic cement

摘要: A glass ceramic cement comprising by weight 20% to 45% ZrO2, 60% Al2 O3, 0% 27% SiO2, 30% CaO, 10% Na2 O, the including at least one material selected from group B2 O3 and PbO, in amounts up 35% 25% respectively, sufficient assist taking ZrO2 into solution during melting of said cement, absence PbO being an amount more than 5%, 2%.