临床折裂的全瓷修复体断口形貌分析

发布时间：2018-05-04 08:29

本文选题：全瓷临床折裂 + 断口表面形貌分析　；参考：《上海交通大学》2014年硕士论文

【摘要】：目的：针对临床收集的全瓷修复体折裂片，应用断口表面形貌学进行分析全瓷失效的裂纹起始源和有关缺陷，探究全瓷修复体的实际破坏方式，为改进临床设计和修复工艺提供依据。方法：收集2012年11月至2013年11月于上海交通大学医学院附属第九人民医院修复科就诊的患者中折裂的全瓷修复体(10例)。1.采用X射线荧光光谱仪，多晶X射线粉末衍射仪检测全瓷修复体的成分及结构。2.采用立体显微镜观察全瓷折裂片断面整体形貌。3.采用扫描电子显微镜(SEM)观察裂纹形态、断口表面形貌、结构缺陷等。结果：循环疲劳是全瓷修复体折裂的重要原因，，不同的全瓷材料，主要的疲劳损伤模式不同。饰瓷内部、饰瓷－核瓷交界面、连接区与饰瓷交界面的缺陷以及咬合接触区的磨损等均能降低陶瓷材料的强度，从而导致全瓷修复体的失效。结论：循环疲劳损伤是全瓷修复体折断的主要原因，其中放射状裂纹是修复体失效的主要模式，对瓷层的厚度高度敏感；饰瓷－核瓷界面是双层全瓷修复体的薄弱环节；结构缺陷和异常咬合导致的应力集中降低材料的强度，是修复体折断潜在的危险因素。连接体的面积也是影响修复体临床失效的重要原因。
[Abstract]:Objective: to analyze the crack origin and related defects of all-ceramic prosthesis by using fracture surface morphology, and to explore the actual failure mode of all-ceramic prosthesis. To provide basis for improving clinical design and repair process. Methods: from November 2012 to November 2013, 10 patients with broken all porcelain prosthesis were collected from the Department of Restoration of the Ninth people's Hospital affiliated to Shanghai Jiaotong University Medical College, Shanghai Jiaotong University. X ray fluorescence spectrometer and polycrystalline X ray powder diffractometer were used to detect the composition and structure of all ceramic restoration. A stereoscopic microscope was used to observe the overall morphology of the fracture section of all porcelain. The crack morphology, fracture surface morphology and structural defects were observed by scanning electron microscopy (SEM). Results: cyclic fatigue is an important reason for fracture of all ceramic restorations. The main fatigue damage modes are different for different all-ceramic materials. The strength of ceramic materials can be reduced, such as the interior of porcelain, the interface between porcelain and core, the defect of interface between porcelain and porcelain, and the wear of bite contact area, which leads to the failure of all ceramic restoration. Conclusion: cyclic fatigue damage is the main cause of fracture of all-ceramic prosthesis, in which radial crack is the main failure mode of restoration, highly sensitive to the thickness of porcelain layer, and the interface between porcelain and core porcelain is the weak link of double-layer all-ceramic prosthesis. The stress concentration caused by structural defects and abnormal bite reduces the strength of the material and is a potential risk factor for the fracture of restorations. The area of connective body is also an important reason for clinical failure of prosthesis.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R783.3

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