IPS-Empress 2 玻璃陶瓷结构及性能的研究

目的 研究新型IPS-Empress 2牙科高强度陶瓷的显微结构和机械性能。方法采用原子力显微镜、扫描电子显微镜和X射线衍射仪，分析IPS-Empress 2的显微结构和晶相，用三点弯曲实验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和磷酸锂晶体组成，二者形成相互交错的三维网络式结构；这种玻璃陶瓷在热压铸前后晶体相保持不变，其三点弯曲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韧性与高含量的二硅酸锂晶体、相互锁结的网络结构和裂纹偏转有关。

Microstructure and mechanical property of a new IPS-Empress 2 dental glass-ceramic

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 toughnedd 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.