机构地区:[1]第四军医大学口腔医学院修复科,西安710032 [2]西安交通大学材料科学与工程学院
出 处:《中华口腔医学杂志》2013年第11期683-688,共6页Chinese Journal of Stomatology
基 金:国家自然科学基金(81371176);陕西省科学研究发展计划(2013K12-16-03)
摘 要:目的探讨模拟口腔环境下长石质玻璃陶瓷和二硅酸锂玻璃陶瓷材料随时间变化的摩擦学特性,从修复体在口内动态咀嚼过程的角度为临床合理评价齿科陶瓷材料的耐磨损性能提供参考。方法将半径为3mm的不锈钢小球分别与长石质玻璃陶瓷(CERAMCO3饰瓷)、二硅酸锂玻璃陶瓷(IPSe.maxPressHT型铸瓷)配副,每组样本量为6,固定于磨损实验机上,在人工唾液、室温环境、加载力10N(频率1.5Hz,匀速圆周运动,转速90r/min,半径0.5mm)的条件下,进行120万次循环的摩擦测试。在20万、40万、60万、80万、100万和120万次循环节点使用三维形貌扫描仪测量铸瓷和饰瓷的体积损失量,使用扫描电镜观测试件表面微观形貌。结果模拟口腔环境下,饰瓷20万、40万、60万、80万、100万和120万次循环时的磨损速率为(0.001204-0.00018)、(0.000104-0.00003)、(0.000504-0.00005)、(0.00010±0.00002)、(0.004104-0.00038)和(Q01900±Q00353)嗍。/万次。铸瓷20万,40万、60万、80万、100万和120万次循环时的磨损速率为(0.13950±0.03094)、(0.12440±0.03120)、(0.05480±0.00538)、(0.038804-0.00610)、(0.011104-0.00375)和(0.19890±0.04580)mm3/万次。两种陶瓷的磨损曲线均呈现跑合期、稳定磨损期和剧烈磨损期。饰瓷在跑合期及稳定磨损期均表现为由疲劳作用产生的表浅磨痕,进入剧烈磨损期后出现犁沟样磨痕;铸瓷在跑合期表现为密集而表浅的犁沟,稳定磨损期出现疲劳作用产生的片状剥脱痕迹,进入剧烈磨损期后在犁削作用下铸瓷瓷层被整片磨除。结论在模拟口腔环境条件下,每个节点铸瓷的磨损速率和磨损量均大于饰瓷。Objective To investigate the tribology characteristics of two ceramic materials in vitro: feldspathic glass-ceramic (veneer porcelain) and lithium disilicate glass-ceramic (heat-pressed ceramic) , and to evaluate the wear resistance of different ceramic materials from the dynamic chewing perspective. Methods Wear tests were performed in simulated oral environment with stainless steel ball antagonists( r = 3 mm), veneer porcelain ( CERAMCO 3 ) and heat-pressed ceramic ( IPS e. max Press HT type) in the chewing simulator. The tribological tests were carried out under artificial saliva lubrication condition in room temperature with a vertical load of 10 N for 1.2 × 106 cycles(f = 1.5 Hz, uniform circular motion, revolving speed = 90 r/min, radius = 0. 5 mm). The wear volumes were measured using three- dimensional profiling, and surface microscopic morphology were observed using scanning electron microscopy at time point of 200 000,400 000,600 000,800 000, 1 000 000, and 1 200 000 cycles. Results In a simulated oral environment, the wear rates of veneer porcelain were (0. 001 20 +0. 00 018), (0. 000 10 ± 0. 000 03), (0. 000 50 ± 0. 000 05), (0. 000 10 ±0. 000 02), (0. 004 10 +0. 000 38) ,and (0. 019 00 + 0. 003 53) ( × 104 mm3/cycles) at 200 000, 400 000, 600 000, 800 000, 1 000 000, 1 200 000 cycles. The wear rates of heat-pressed ceramic were (0. 139 50 ± 0. 030 94) , (0. 124 40 ± 0. 031 20) ,( 0. 054 80 + 0. 005 38 ), (0. 038 80 ± 0. 006 10 ), ( 0. 011 10 ± 0. 003 75 ), ( 0. 198 90 ± 0. 045 80 ) ( × 10 4 mm3/cycles) at 200 000, 400 000, 600 000, 800 000, 1 000 000, 1 200 000 cycles. Three stages were ohserved in the wear loss process of the two materials: running-in stage,steady wear stage and severe wear stage. In running-in and steady wear stage, the shallow weal tracks of veneer porcelain were produced by the fatigue effect. While in severe wear stage, the wear tracks turned into ploughing. In running-in stage
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