实验的目的是分析牙科热压技术对新型二硅酸锂玻璃陶瓷微观结构和化学稳定性的影响.对Li2O-SiO2-K2O-Al2O3-Zr02-P2O2玻璃系统进行晶化热处理,应用牙科热压技术制备化学稳定性测试试件.X射线衍射(XRD)分析热压前后玻璃陶瓷的物相组成,扫描电镜(SEM)观察微观结构,根据ISO6872标准测试材料的化学稳定性.结果表明,热压前后玻璃陶瓷的晶相组成均以二硅酸锂(Li2Si2O5)为主,热压后,主峰强度增高,晶体尺寸增大,并且呈现沿热压方向的定向排列趋势.热压前后玻璃陶瓷的化学稳定性均符合ISO6872标准要求,热压组试件对化学腐蚀有较强的抵抗性.牙科热压技术能够改变实验玻璃陶瓷的微观结构,进而提高材料的化学稳定性.
The purpose of this study was to investigate the effects of dental heat-pressing on the microstructure and chemical stability of a novel lithium disilicate glass-ceramic. The parent glass derived from SiO2-Li2O-K2O-Al2O3-ZrO2-P2O5 system was melted and heat-treated. Then half glass-ceramic specimens were subjected to dental heat-pressing. The crystalline phase composition and microstructures were analyzed by X-ray diffractom-etry (XRD) and scanning electron microscopy(SEM). Chemical stability of glass-ceramic specimens was meas-ured following the instruction of ISO 6872. Results demonstrated that lithium disilicate (Li2Si2O5) represented the main crystalline phase for both heat-pressed and controlled specimens. Increased relative intensities of major peaks and prolonger crystalline size were observed after heat pressing, which was attributed to the rearrange-ment of the monoclinic lithium disilicate crystals. Heat-pressed glass-ceramic showed stronger resistance to chemical corrosion. Dental heat-pressing could result in the change in microstructure and improve the chemical stability of experimental glass-ceramic.
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