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[Coloration of mica glass ceramic for use in dental CAD/CAM system]
Ying Sun1, Zhong-yi Wang, Jie-mo Tian
1Depatment of Prosthodontics, College of Stomatology, Fourth Military Medical University, Xian 710032, China.
Objective:
An intrinsically colored machinable glass-ceramic containing tetrasilicic fluormica as the predominant crystal phase was studied, which was used in molar crown in dental CAD/CAM system.
Methods:
Orthogonal design analysis was used to select appropriate base formula, coloration and heat treatment process.
Results:
Factors influencing the color appearance of mica glass ceramic were nucleation agent and the ratio of Mg(2+) to K(+) in base formula; Cerium oxide (CeO(2)) was used as the main coloration; The preferred heat treatment was 650 degrees C for 1 h and 1,000 degrees C or 1,050 degrees C for 3 h - 4 h.
Conclusions:
This mica glass-ceramic could provide 4 to 5 color appearance for dental use, it showed excellent machinability which was eminently suitable for use in dental CAD/CAM system.
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