No alkali containing biocompatible glass ceramic with apatite, wollastonite and diopside crystals mixed

Abstract From the Canadian patent

s, A biocompatible glass ceramic comprises by, weight, 7 - 16% MgO, 20 - 45% CaO, 41 - 50% SiO2 8 -, 30% P2O5, 0 - 5% B2O3, 0 - 5% F2, and 0 - 10% Al2O3 and, has a crystal structure where a number of fine crystals of apatite, wollastonite, and diopside are densely dispersed and interlace with one another in a glass phase. The glass ceramic is non-porous and has an increased mechanical strength of 2,000 Kg?f/cm2 without degradation of the chemical bonding with the bone of the living body. The glass ceramic contains no alkali and is chemically stable in the living body. The glass ceramic is useful for replacement materials of tooth roots and crowns as well as bones.