プレス成形可能な歯冠材料用CaO-MgO-SiO_2-TiO_2-Ag_2O系ガラスの作製

概要

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Glass-ceramics were searched for in the systems based on CaO-MgO-SiO_2-TiO_2-Ag_2O. The glasses melted at 1500℃ could be cast. The absorptions were measured. Silver colloids formed in the glasses of composition CaO・MgO・2SiO_2・0.375TiO_2・0.007Ag-2O, and CaO・MgO・2SiO_2・0.49TiO_2・0.007Ag_2O. The crystallization of diopside of these glasses are controlled by volume nucleation and growth processes. It is shown that the activation energy for crystallization of diopside decreases of these glasses. A fluidity of diopside glass was observed at 800-900℃ by the viscous flow mechanism. It can be formed precisely and crystallized under pressure of 0.15 MPa at 850℃ for 40 min, and the glass-cer-amics contained crystalline diopside. The bending strength was about 350 MPa. This glass-ceramics crystal phase look similar to natural teeth in color and translucency without any deformation. Such a press-forming method is superior to casting method because it is free from pores, and it can be formed lower temperature than 900℃ regardless of the glass has high melting point.
社団法人日本セラミックス協会の論文
1996-03-01