[新型IPS-Empress 2牙科玻璃陶瓷的微观结构与力学性能]
[Microstructure and mechanical property of a new IPS-Empress 2 dental glass-ceramic].
作者信息
Luo Xiao-ping, Watts D C, Wilson N H F, Silsons N, Cheng Ya-qin
机构信息
Department of Prosthodontics, Nanjing Stomatological Hospital, Nanjing 210008, China.
出版信息
Zhonghua Kou Qiang Yi Xue Za Zhi. 2005 Mar;40(2):147-9.
OBJECTIVE
To investigate the microstructure and mechanical properties of a new IPS-Empress 2 dental glass-ceramic.
METHODS
AFM, SEM and XRD were used to analyze the microstructure and crystal phase of IPS-Empress 2 glass-ceramic. The flexural strength and fracture toughness were tested using 3-point bending method and indentation method respectively.
RESULTS
IPS-Empress 2 glass-ceramic mainly consisted of lithium disilicate crystal, lithium phosphate and glass matrix, which formed a continuous interlocking structure. The crystal phases were not changed before and after hot-pressed treatment. AFM showed nucleating agent particles of different sizes distributed on the highly polished ceramic surface. The strength and fracture toughness were 300 MPa and 3.1 MPam(1/2).
CONCLUSION
The high strength and fracture toughness of IPS-Empress 2 glass ceramic are attributed to the fine lithium disilicate crystalline, interlocking microstructure and crack deflection.
目的
研究新型IPS-Empress 2牙科玻璃陶瓷的微观结构和力学性能。
方法
采用原子力显微镜（AFM）、扫描电子显微镜（SEM）和X射线衍射仪（XRD）分析IPS-Empress 2玻璃陶瓷的微观结构和晶相。分别采用三点弯曲法和压痕法测试其弯曲强度和断裂韧性。
结果
IPS-Empress 2玻璃陶瓷主要由二硅酸锂晶体、磷酸锂和玻璃基质组成，形成连续的互锁结构。热压处理前后晶相未发生变化。AFM显示不同尺寸的成核剂颗粒分布在高度抛光的陶瓷表面。强度和断裂韧性分别为300MPa和3.1MPam(1/2)。
结论
IPS-Empress 2玻璃陶瓷的高强度和断裂韧性归因于细小的二硅酸锂晶体、互锁的微观结构和裂纹偏转。
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