| 摘要 |
PURPOSE:To provide the titled crystallized glass most suitable as an artificial bone and a dental material by composing the glass of the oxide of Cu, Li, La, Gd, Ti, Sm, Nb, Zr, or Ru and specified calcium phosphate, vitrifying, and then crystallizing the material. CONSTITUTION:The glass consists of 0.1-30wt% >=1 kind of oxide selected from the oxide of Cu, Li, La, Gd, Ti, Sm, Nb, Zr, and Ru and the remainder of calcium phosphate whose atomic ratio of calcium to phosphorus is regulated to 0.35-1.7, and the material is vitrified, then heat-treated and crystallized. When the content of the oxide is regulated to <0.1wt%, the effect is not fully exhibited, because the crystallization proceeds mostly with devitrification on the surface. Meanwhile, when the content is regulated to >=30wt%, the m.p. is gradually increased, the viscosity is also increased, and the moldability is unfavorably effected. When said atomic ratio exceeds the value of 1.7, the m.p. is raised, and the material is not vitrified. Meanwhile, when the ratio is lower than 0.35, crystallization becomes difficult, and the material is unfavorably made chemically unstable. |
