后牙烤瓷修复冠\桥疲劳寿命的测定
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[摘要]目的：测定后牙烤瓷修复冠、桥的疲劳寿命。方法：制作后牙烤瓷冠、桥试件各3个，进行疲劳寿命测定，分别在实验进行0、16、48、80、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的微裂隙长达30～50μm。结论：烤瓷修复体具有相当优良的机械力学性能，可以作为后牙的永久性修复体。
[关键词]后牙；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)06-0990-03
Measuring the fatigue life of porcelain fused metal crown and bridge of posterior teeth
LI Ming-yong1,MA Xuan-xiang2,LI Yu-long3,LI Zhun1,AI Lin1,ZHOU Zhang-hua1,ZHANG Hai-xia
(1.Department of Stomatology,No.451 Hospital of PLA,Xi'an 710054,Shaanxi,China;2. College of Stomatology, The Fourth Military Medical University;3.College of Aircraft Engineering of Northwestern Polytechnical University)
Abstract:ObjectiveTo measure the fatigue life of porcelain fused metal (PFM) crown and bridgeof posterior teeth. Methods PFM 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. Results Each PFM crown and bridge of posterior teeth had no procelain cracks in evidence after experiment,however there were some microscopic wears among 30～50μm appeared on the surface of functional area by SEM after simulating mastication 20 years.Conclusion PFM restorations of posterior teeth have rather fine mechanics characteristic. It may last 20 years even longer by using normal masticatory force.
Key words:posterior teeth;porcelain fused to metal(PFM);crown;bridge;fatigue life;fatigue wear
后牙是食物咀嚼的主要部位,其修复体应有足够的抗力性能、抗疲劳性能。以往对后牙的美观要求不太高，因而在后牙固定修复时，多选用金属铸造冠、桥。随着烤瓷修复技术的普遍开展，烤瓷材料的性能不断加强，后牙烤瓷修复也成为主流[1]。本实验的目的是通过对后牙烤瓷冠、桥的疲劳寿命进行测定，进一步了解烤瓷修复冠、桥的抗疲劳性能，为解决修复体使用寿命提供依据。
1材料和方法
1.1 实验设备、材料：口腔疲劳测试试件：选用后牙单冠基牙模型和后牙桥基牙模型；对应下颌选用后牙桥基牙模型[2]、口腔修复体疲劳寿命测试机[3]、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后牙桥基牙模型上制作B5-B7金属铸造桥1个，基牙单冠厚度0.5～1.0mm，牙合面形态用标准模型的后牙蜡型翻制；再用后牙单冠基牙模型和后牙桥基牙模型制作相对应的D区第一磨牙烤瓷冠、D区第一磨牙缺失的三单位D5-7烤瓷桥 ......
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