牙科可切削云母微晶玻璃呈色的研究

目的 研制用于牙科计算机辅助设计与辅助制作磨牙冠、可提供多种颜色选择的可切削四硅酸氟云母微晶玻璃。方法 采用正交设计技术，对影响微晶玻璃颜色的基础配方、色料组成及热处理制度进行筛选。结果 从基础配方中选择出影响呈色的2个主要因素：晶核剂F含量、Mg^2 ／K^ 比例；从多种色料中选择出主要色料CeO2；从热处理制度中选择出成核制度：650℃保持1h和晶化制度：1000℃或1050℃保持3h～4h,，结论 所研制的云母微晶玻璃，可提供4～5种牙科颜色，其切削性能良好，完全可以满足计算机辅助设计．辅助制作(CAD／CAM)系统的要求。

Coloration of mica glass ceramic for use in dental CAD/CAM system

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.