关键词: 玻璃/超微结构;四硅氟云母;径厚比

    摘 要:目的 研究晶化温度对牙科CAD/CAM加工用四硅氟云母微晶玻璃微观结构的影响. 方法 选用K2 O-MgO-MgF2 -SiO2 系统来制备云母微晶玻璃，通过差热分析(DTA)、X射线衍射分析(XRD)、扫描电子显微镜观测(SEM)及三点弯曲强度的测试，比较了三种不同晶化温度对四硅氟云母微晶玻璃的晶化特性、微观结构及抗弯强度的影响. 结果 随着晶化温度的逐步升高，四硅氟云母晶粒的形态由球形转变为片层状，晶粒尺寸和径厚比逐步增大，微晶玻璃的抗弯强度也逐步升高，但其晶相组成未发生明显变化. 结论 晶化温度对四硅氟云母微晶玻璃的微观结构起决定作用.

    Influence of crystallization temperature on mi┐crostructures of mica┐based glass┐ceramics for den┐tal restorations

    QIN Yan-Jun ，WANG Zhong-Yi ，CAO Xiao-Gang ，TIAN Jie-Mo

    1 Department of Restorative Dentistry，Stomatologi-cal College，Fourth Military Medical University，Xi'an710033，China;

    2 State Key Laboratory of New Ceramics&Fine Processing，Tsinghua Univer-sity，Beijing100084，China

    Keywords:glass/ultrastructure;tetrasilicic fluormica;aspect ratio

    Abstract:AIM To investigate the influence of crystalliza-tion temperature on microstructures of mica-based machin-able glass-ceramics used for CAD/CAM dental restorations.

    METHODS According to the requirements of dental restorative materials，K2 O-MgO-MgF2 -SiO2 glass-ceramics system was chosen to make tetrasilicic fluormica glass-ceram-ics and three different temperatures were used to finish the crystallization procedure.Differential thermal analysis(DTA) ......