A new type of glass-ceramic for novel dental fillers, which require excellent chemical durability, was investigated. A 40CaO-5CaF{sub}2-25TiO{sub}2-30P{sub}2O{sub}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{sub}4(PO{sub}4){sub}6, titanium phosphates, such as (TiO){sub}2P{sub}2O{sub}7 and Ti(PO{sub}3){sub}3, and TiO{sub}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.
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