中文摘要：

实验的目的是分析牙科热压铸造技术对Li2O-SiO2-K2O-Al2O3-ZrO2-P2O5系新型牙科二硅酸锂玻璃陶瓷的微观结构和性能的影响。X射线衍射（XRD）分析玻璃陶瓷的物相组成,扫描电镜（SEM）观察材料的微观结构,根据ISO6872标准测试材料的弯曲强度。结果表明,晶化热处理后的玻璃陶瓷的晶相组成以棒形的二硅酸锂为主,此新型陶瓷可以用商业化的设备进行热压铸造处理,热压后陶瓷的机械性能显著高于对照组,SEM显示与对照组相比,热压组陶瓷的晶体沿压铸方向呈现定向排列趋势,XRD显示热压后玻璃陶瓷的晶相组成未发生变化。通过牙科热压铸造技术,此种新型玻璃陶瓷内部形成各向异性的结构,获得较高的挠曲强度,可以满足牙科美学修复的要求。

英文摘要：

The purpose of this study was to investigate the effects of dental heat pressing on the microstructure and properties of a novel lithium disilicate glass-ceramic located in Li2O-SiO2-K2O-Al2O3-ZrO2-P2O5 system. Before and after respective heat pressing conditions,the crystalline phase composition and microstructures were analyzed by X-ray diffractometry（XRD） and scanning electron microscopy（SEM）. Three-point flexural strength of glass-ceramic specimens was measured following the instruction of ISO 6872. The results showed that the bonding strength of the heat-pressed specimens was higher than that of the heat treated controls. XRD examination showed the main crystallization in specimens after heat pressing was lithium disilicate as controls. The SEM examination indicated crysta1s were aligned along the direction of pressing,and while in control groups crystals randomly interlocked.Dental heat pressing procedure leads to an anisotropic structure in lithium disilicate glass-ceramic,which is a useful method to improve the mechanical property. With the results under the present conditions,the novel lithium disilicate glass-ceramic may be considered as a promising candidate material for dental all-ceramic application.