| 摘要 |
A dental crown formed of a dental crown material comprising crystallized glass containing 40 to 45% by weight of SiO2, 11 to 15% by weight of Al2O3, 16 to 23% by weight of MgO, 6.5 to 8% by weight of F, 4.0 to 7.0% by weight of Na2O, 5 to 9% by weight of Li2O, not more than 1% by weight of TiO2, 2 to 4% by weight of ZrO2, and at least one oxide selected from the group consisting of Fe2O3, MnO, CeO2 and NiO, and having a bending strength of at least 2000 Kg/cm2. |
