| abstract |
A glass material of the invention contains SiO 2 , MgO, Al 2 O 3 , and TiO 2 as main components in amounts of 40-65% by weight of SiO 2 , 9-30% by weight of MgO, 8-31% by weight of Al 2 O 3 , and 6-15% by weight of TiO 2 , and satisfies expression I: {100 - (A + S + T)}/S ≧ 0.340 wherein A, S and T are contents in % by weight of Al 2 O 3 , SiO 2 , and TiO 2 , 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. |