Preparation and Characterization of P۲O۵ Containing Canasite Glass-Ceramics as Potential Materials for Dental Restorations

Various analysis techniques were used to investigate the effects of P۲O۵ on the crystallization, mechanical features, and chemical resistance of canasite-based glass-ceramics. The results showed that canasite-type crystals were the primary crystalline phase in the examined glass-ceramics subjected to the two-step heat treatment, while fluorapatite was the secondary crystalline phase in some specimens. The microstructural observations by field emission electron microscope indicated that the randomly oriented interlocked blade-like canasite crystals decreased with an increase in the P۲O۵ content of the parent glasses. Among the examined glass-ceramics, the Base-P۲ composition (containing ۲ weight ratios of P۲O۵ in the glass) showed the most promising mechanical features (flexural strength of ۱۷۶ MPa and fracture toughness of ۲.۹ MPa.m۱/۲) and chemical resistance (solubility of ۲۵۶۸ µg/cm۲). This glass-ceramic could be further considered as a core material for dental restorations.

Keywords:

Glass-ceramic , Dental restorations , Canasite , Mechanical properties , Chemical durability