Effect of Heat-Pressing on the Microstructure and Properties of a Novel Lithium Disilicate Glass-ceramic
The purpose of this study was to investigate the effects of heat pressing on the microstructure and properties of a novel lithium disijicate glassceramic located in Li2O-SiO2-K2O-Al2O3-ZrO2-P2O5 system. Before and after respective heat pressing,the crystalline phase composition and microstructures were analyzed by X-ray diffraction (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 heatpressed 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. SEM examination indicated crystals were aligped 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 propefly. With the results under the present conditions,the novel Iithium disilicate glass-ceramic may be considered as a promising candidate material for dental all-ceramic application.
Heat pressing Glass-ceramic Lithium disilicate Flexural strength
Gao Jing Chen Ji-hua Wang Fu Deng Zai-xi Li Feng Wu Dan
Department of Prosthodontics,College of Stomatology,Fourth Military Medical University,Xian 710032, Department of Dental Laboratory Center,College of Stomatology,Fourth Military Medical University,Xi
国际会议
Frist Annual Meeting on Testing and Evaluation of Inorganic Materials(第一届全国无机材料测试与评价学术年会)
南昌
英文
441-446
2010-04-28（万方平台首次上网日期，不代表论文的发表时间）