Wang Fu, Chai Zhiguo, Deng Zaixi, Gao Jing, Wang Hui, Chen Jihua
State Key Laboratory of Medical Stomatology, Department of Prosthodontics, 2; Department of Dental Technical Laboratory, School of Stomatology, Fourth Military Medical University, Xi'an, PR China.
State Key Laboratory of Medical Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, PR China.
PLoS One. 2015 May 18;10(5):e0126896. doi: 10.1371/journal.pone.0126896. eCollection 2015.
The present study aimed to evaluate the influence of various heat-pressing procedures (different holding time and heat pressing temperature) on the microstructure and flexural strength of lithium disilicate glass ceramic. An experimental lithium silicate glass ceramic (ELDC) was prepared from the SiO2-Li2O-K2O-Al2O3-ZrO2-P2O5 system and heat-pressed following different procedures by varying temperature and holding time. The flexural strength was tested and microstructure was analyzed. The relationships between the microstructure, mechanical properties and heat-pressing procedures were discussed in-depth. Results verified the feasibility of the application of dental heat-pressing technique in processing the experimental lithium disilicate glass ceramic. Different heat-pressing procedures showed significant influence on microstructure and flexural strength. ELDC heat-pressed at 950℃ with holding time of 15 min achieved an almost pore-free microstructure and the highest flexural strength, which was suitable for dental restorative application.
本研究旨在评估各种热压程序（不同保温时间和热压温度）对二硅酸锂玻璃陶瓷微观结构和抗弯强度的影响。由SiO2-Li2O-K2O-Al2O3-ZrO2-P2O5系统制备了一种实验性锂硅酸盐玻璃陶瓷（ELDC），并通过改变温度和保温时间按照不同程序进行热压。测试了抗弯强度并分析了微观结构。深入讨论了微观结构、力学性能和热压程序之间的关系。结果验证了牙科热压技术在加工实验性二硅酸锂玻璃陶瓷中的应用可行性。不同的热压程序对微观结构和抗弯强度有显著影响。在950℃保温15分钟热压的ELDC获得了几乎无孔隙的微观结构和最高的抗弯强度，适用于牙科修复应用。
