二硅酸锂玻璃陶瓷与牛牙釉质磨损性能的体外实验研究

发布时间：2018-04-12 16:53

本文选题：二硅酸锂玻璃陶瓷 + 磨损　；参考：《实用口腔医学杂志》2017年01期

【摘要】：目的:研究模拟口腔环境下牛牙釉质与二硅酸锂玻璃陶瓷的磨损特性。方法:将18个长8 mm、直径3 mm的二硅酸锂玻璃陶瓷圆柱作为上颌磨头,分别与下颌二硅酸锂玻璃陶瓷或牛牙釉质试件配副,每组9个样本,利用摩擦磨损试验机,在人工唾液、室温环境、10 N载荷、转速100 r/min、回转半径2.5 mm、匀速圆周运动的条件下进行54万次循环磨损实验。在整个磨损周期中选取10个循环节点,用三维形貌仪测量每个节点下颌试件的磨损高度损失量并绘制相应磨损曲线,扫描电镜观察相应磨损阶段对应的磨损面微观形貌。结果:各循环节点牛牙釉质的磨损量均大于二硅酸锂玻璃陶瓷的磨损量(P0.05);实验循环周期内,牛牙釉质的磨损曲线呈现出"跑合期"、"稳定磨损期"、"剧烈磨损期"3个磨损阶段,而二硅酸锂玻璃陶瓷的磨损曲线呈现"跑合期"和"稳定磨损期"两个磨损阶段。2组的微观形貌也呈现出与磨损曲线相对应的阶段性动态衍化规律。结论:在模拟口腔环境下,牛牙釉质和二硅酸锂玻璃陶瓷的磨损行为均呈现出阶段性动态衍化规律;牛牙釉质的磨损量显著高于二硅酸锂的磨损量,提示应注意防止二硅酸锂玻璃陶瓷修复体对对颌天然牙的过度磨损。
[Abstract]:Aim: to study the wear characteristics of bovine enamel and lithium disilicate glass ceramics under simulated oral environment.Methods: 18 lithium disilicate glass ceramic cylinders, which were 8 mm long and 3 mm in diameter, were used as maxillary grinders, and matched with mandibular lithium disilicate glass ceramics or bovine enamel specimens respectively. Each group of 9 samples was used in artificial saliva with friction and wear tester.540000 cycling wear experiments were carried out under the condition of 10 N load at room temperature, 100 r / min rotational speed, 2.5 mm radius of rotation and uniform circular motion.The wear curve of LiSi2O _ 3 glass ceramics shows the phase dynamic evolution law corresponding to the wear curve in the two wear phases of "run-in" and "stable wear".Conclusion: under the simulated oral environment, the wear behavior of bovine enamel and lithium-disilicate glass ceramics showed a dynamic evolution law, and the wear amount of bovine enamel was significantly higher than that of lithium disilicate.It is suggested that attention should be paid to the prevention of excessive wear of natural jaw teeth by lithium disilicate vitreous ceramic restorations.
【作者单位】：军事口腔医学国家重点实验室口腔疾病国家临床医学研究中心陕西省口腔医学重点实验室第四军医大学口腔医院修复科;
【基金】：国家自然科学基金(编号:81371176) 陕西省科技统筹创新工程计划项目(编号:2015KTCL03-08)
【分类号】：R783.1

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