Abstract: CaO-MgO-P₂O₅-SiO₂ glass-ceramic is a new medicinal biologic material. It not only has good
biocompatibility but also improves mechanical properties. The kinetic parameters of this glass-ceramic were calculated by differential thermal
analysis (DTA) and the JMA equation. The results indicate that the content of TiO₂ effects on the crystallization activation energy (E) and the
crystal growth index (n). E increases with the increasing of TiO₂ content. And E reaches a max value when TiO₂ content is about
8.7%. When TiO₂ content increases further (>8.7%), E decreases inversely. The rule of n vs TiO₂ content is consistent with that
of E vs TiO₂ content.

Key words: biologic glass-ceramic, crystallization, ceramic restorations