前牙烤瓷修复冠-桥疲劳寿命测定.docVIP

前牙烤瓷修复冠\桥疲劳寿命测定[摘要]目的：测定前牙烤瓷修复冠、桥的疲劳寿命。方法：制作前牙烤瓷冠、桥试件各3个进行疲劳寿命测定，分别在实验进行0h、16h、48h、80h、160h时，用体视显微镜下咬合部位瓷层表面状态，至320h后实验结束，在扫描电镜下观察。结果：各组烤瓷冠、桥体均未出现明显的瓷崩裂现象，但在咬合部位及其附近均出现不同程度的微裂隙(列席小于20μm)。结论：前牙烤瓷修复体不仅具有良好的美学特性，而且也具有相当优良的抗疲劳特性。 [关键词]前牙；烤瓷；冠；桥；疲劳寿命；疲劳性磨耗 [中图分类号]R783 [文献标识码]A [文章编号]1008-6455（2011）05-0831-03 Measuring the fatigue life of porcelain fused metal crown and bridge of anterior teeth LI Ming-yong1,MA Xuan-xiang2,LI Yu-long3,SUO Tao3,LI Hao-ping1,MENG Yuan1,HUO Li1,LIU Fang-xia1 （1.Department of Stomatology, No. 451 Hospital of PLA, Xi’an 710054, Shaanxi,China;2. School of Stomatology,The Fourth Military Medical University;3. Aviation Institute, Northwestern Polytechnical University） Abstract:ObjectiveTo measure the fatigue life of porcelain fused metal (PFM) crown and bridgeof anterior teeth.MethodsPFM crown and bridge of anterior teeth were made for measurement of its fatigue life. The surface of porcelain on bitting area were observed by stereoscopic zoom microscopes after 0h、16h、48h、80h、160h, and by scaning electric microscopes(SEM) after 320h.ResultsEach PFM crown and bridge of anterior teeth had no procelain cracks in evidence after experiment, however there are some microscopic wears by SEM (under 20μm).ConclusionPFM restorationsof anterior teeth have not only esthetics capability but also rather fine anti-fatigue characteristic. Key words:anterior teeth;porcelain fused to metal(PFM);crown;bridge;fatigue life;fatigue wear 前牙的大面积缺损、严重变色一般选择烤瓷冠、桥修复。由于前牙的美观要求较高，口腔医学工作者多把注意力集中于其色彩和形态的研究上[1-2]，而对其力学性能关注较少。本实验的目的是通过自行研制的口腔修复体疲劳寿命测试机对前牙烤瓷冠、桥的疲劳寿命进行测定，以全面认识前牙烤瓷修复体的各项性能。 1材料和方法 1.1 实验设备、材料：口腔疲劳测试试件选用前牙单冠基牙模型和前牙桥基牙模型、对应下颌选用前牙桥基牙模型[3]、口腔修复体疲劳寿命测试机[4]（自行研制）、YD-15动态电阻应变仪（华东电子仪器厂）、Micro-measurements Division EP-08-031DE-120应变片（Measurement Group Inc. ,U.S.A ）4张、Tektronic K420示波器（Tektronic Inc.,U.S.A）、Nikon SMZ800体视显微镜（Nikon Inc.,Japan），Jeol JSM-5800扫描电镜（Jeol electric Ltd.,Japan）。 1.2 方法 1.2.1 在选用的下前牙桥基牙模型上制作C1-D2金属铸造桥1个，基牙单冠厚度0.5～1.0m