桩核冠修复不同程度缺损下颌前磨牙的三维有限元分析  

Three Dimensional Finite Element Analysis of Defected Mandibular Premolar Restored with Post and Core Crown

作　　者：宋亮[1] 徐斌[1] 陈慧娟[1] 刘柳慧[1] 胡开明[2] 

机构地区：[1]复旦大学附属上海市第五人民医院口腔科,上海200240 [2]上海交通大学机械动力学院,上海200240

出　　处：《口腔医学研究》2015年第10期1013-1016,共4页Journal of Oral Science Research

基　　金：上海市闵行区卫生局课题(2012MW10);闵行区青年医师资助项目;上海市第五人民医院曙光青年资助项目(2013YSGQN10)

摘　　要：目的:利用三维有限元分析法研究下颌第二前磨牙牙冠不同程度缺损的情况下,纤维桩树脂核修复后的应力分布,为临床桩核冠的修复设计提供理论依据。方法:利用多层螺旋CT扫描结果,建立缺损区牙本质肩领高度分别为0mm、1mm、2mm,缺损部位分别为牙冠部360°缺损、牙冠部近远中邻面各缺损1/3、牙冠远中邻面缺损1/2、牙冠远中邻面缺损1/3的实验模型。比较12组不同程度牙冠缺损情况下,纤维桩树脂核全瓷冠修复后牙体和桩核的应力分布情况。结果:剪切应力最大值出现在无牙本质肩领、牙冠360°缺损的情况下;最大主应力出现在颊舌侧有牙本质存在而邻面牙本质缺损的情况下。结论:冠部无牙本质肩领时要避免使用纤维桩树脂核修复;当颊舌侧牙本质的宽度不足时,需要通过增加牙本质肩领的高度来提高纤维桩树脂核修复的安全性。Objective：To investigate the effect of different degrees of dentin defect on the stress distribution of post and core restored mandibular premolar by three dimension finite element analysis.Methods：Spiral CT based threedimensional finite element models of post and core restored mandibular premolar were established.The ferrule heights of the defective area were respectively 0mm,1mm,2mm.The defect sites and extent were respectively the whole crown defect,1/3of the mesial and distal proximal surface,1/2of distal proximal surface,and 1/3of distal proximal surface.The stress distribution of the defect models restored by fiber post and resin core was analyzed.Results：The maximum shear stress occurred in the whole crown defect models and the models without ferrule.The maximum principal stress appeared in the mesiodistal dentin defect models.Conclusion：Fiber post and resin core restoration should be avoided where the dentin ferrule is not left.When the buccal-lingual dentin width is insufficient,the dentin ferrule height should be increased to secure the fiber post and resin core restoration.

关 键 词：三维有限元 纤维桩树脂核 应力分析 下颌前磨牙 

分 类 号：R783[医药卫生—口腔医学]