| abstract |
(57) Abstract: To obtain a crystallized glass dental restorative material having excellent mechanical strength and chemical durability and having sufficient aesthetics. A (CaO + SrO) / molar ratio of P 2 O 5 is from 0.81 to 0.86, and, in the plate thickness t (mm), the absorbance due to the hydroxyl group represented by beta OH is Calcium phosphate-based glass having a size of 0.5 to 4 mm -1 . |