石英纤维桩复合树脂核全冠修复无髓牙的疲劳抗性  

Fatigue resistance of pulpless teeth restored with quartz-fiber post crown

作　　者：亓莉莉[1] 聂二民[1] 陈霞云[2] 黄颖荷[1] 刘伟[1] 张春元[1] 

机构地区：[1]中山大学附属第一医院口腔科,广东省广州市510080 [2]中山大学附属第三医院口腔科,广东省广州市510630

出　　处：《中国组织工程研究与临床康复》2010年第12期2167-2170,共4页Journal of Clinical Rehabilitative Tissue Engineering Research

基　　金：广东省科技厅社会发展项目(2008B080703032)。课题名称:口腔生物力学循环测试机的实验研究~~

摘　　要：背景:研究表明口腔的日常咀嚼功能会对纤维桩核修复体的抗折性能产生影响。目的:评价石英纤维桩复合树脂核全冠修复的下颌前磨牙的疲劳抗性。方法:将正畸拔除的44颗单根前磨牙分为实验组和对照组,每组22颗,离体牙行石英纤维桩复合树脂核金属烤瓷冠修复,实验组行频率为6Hz、次数为120万次的45°循环加载,对照组不进行循环加载,然后两组分别行速率为1mm/min的45°侧向加载。记录牙根出现折裂时的破坏力值、牙根的折裂模式以及桩核脱位情况。结果与结论:实验组和对照组的抗荷载力均值分别为(733.88±254.99)N和(869.14±280.26)N,两组之间差异无显著性意义(P>0.05)。实验组有1例垂直根折,其余均为可修复性根折,两组未见桩核脱位现象。说明石英纤维复合树脂桩核系统修复后的离体牙整体疲劳抗性优异。BACKGROUND：Studies demonstrate that there are some effects of oral masticatory function on the fracture resistance ability of the fiber post-core prosthesis.OBJECTIVE：To evaluate the fatigue resistance of lower premolars restored with quartz-fiber post-core and full crown.METHODS：Totally 44 single rooted lower premolars recently extracted from orthodontic patients were divided into the experimental and the control groups,with 22 teeth in each group.All the teeth were restored with fiber post-core and full crown.In the experimental group,loads were applied at an 45° to the long axis of the teeth with a cyclic loading at a 6 Hz frequency,and then both two groups were loaded at an 45° to the long axis of the teeth at a crosshead speed of 1 mm/min.The destructive force values,the fracture mode of root and the situation of post-core dislocation with root fracture were recorded.RESULTS AND CONCLUSION：The mean loading force was（733.88N±254.99）N and（869.14N±280.26）N in the experimental group and the control group,respectively,and there was no significant difference in two groups（P 0.05）.The experimental group had one case with vertical root fracture,the others had repairable root fracture and the dislocation of post-core did not happen in the two groups.The results demonstrated that there is a good fatigue resistance in the removed teeth with quartz-fiber post-core and full crown.

关 键 词：疲劳抗性 石英纤维桩 复合树脂核 循环加载 口腔生物材料 

分 类 号：R318[医药卫生—生物医学工程]