Glass material, biological tissue replacement materials and orthodontic material

摘要

A glass material of the invention contains SiO2, MgO, Al2O3, and TiO2 as main components in amounts of 40-65% by weight of SiO2, 9-30% by weight of MgO, 8-31% by weight of Al2O3, and 6-15% by weight of TiO2, and satisfies expression I: ä100 - (A + S + T)ü/S /= 0.340 wherein A, S and T are contents in % by weight of Al2O3, SiO2, and TiO2, respectively, and Expression II: (S + M)/4 100 - (S + M + A + T) wherein M is a content in % by weight of MgO, and is substantially free of fluorine. It is used in the preparation of a living tissue replacement or orthodontic part. A living tissue replacement and orthodontic part which experience a minimal loss of material properties in a deleterious environment as in the oral cavity and should have a complex shape as in the case of a dental crown repair, high strength and aesthetic appearance can be briefly prepared in a safe manner without using a special manufacturing apparatus.