[Study on thermal treatment schedule of leucite microcrystallization to reinforce dental glass ceramics].

OBJECTIVE: To explore the thermal treatment schedule of leucite microcrystallization to reinforce dental glass ceramics. METHODS: After component analysis and selection, the raw material were treated by different temperature schedules. The products were analyzed by polaring microscope and X-ray diffractometer to determine the appropriate thermal treatment schedule. RESULTS: The temperature of melting, nuclearing and crystalizing was 1,600 degrees C, 1,200 degrees C and 1,500 degrees C. Leucite microcrystals dispersed in the glass matrix evenly and the size of leucite particle was about 0.8 micro m. CONCLUSION: Leucite can be microcrystalized according to an appropriate thermal treatment schedule.