Preparation of Apatite-Containing Calcium Phosphate Glass-Ceramics

摘要

A new type of glass-ceramic for novel dental fillers, which require excellent chemical durability, was investigated. A 40CaO-5CaF_2-25TiO_2-30P_2O_5 (in mol%) glass-ceramic was newly suggested. The glass-ceramic was prepared by a conventional two-step heating method. The resulting glass-ceramic included Nasicontype-CaTi_4(PO_4)_6, titanium phosphates, such as (TiO)_2P_2O_7 and Ti(PO_3)_3, and TiO_2 (anatase) with apatite crystal, which was induced by incorporation of fluorine. In the glass-ceramic, dissolution by acid-treatment was strictly controlled. The excellent chemical durability of the glass-ceramic was suggested to originate from increase in the amount of the crystalline phases and a high content of titanium constituent in the residual glassy phase.