下颌后牙单端桥基牙骨支持组织应力的动力学分析  

A dynamic finite element analysis of stress distribution in supporting bone of mandibular cantilever fixed bridge abutment

作　　者：黄珊[1] 唐亮[2] 潘燕环[3] 殷仲达[2] 

机构地区：[1]暨南大学附属第一医院口腔科,广东广州510632 [2]暨南大学医学院口腔医学系,广东广州510632 [3]暨南大学理工学院土木工程系,广东广州510632

出　　处：《中国病理生理杂志》2012年第3期524-527,共4页Chinese Journal of Pathophysiology

基　　金：广东省自然科学基金资助项目(No.31912)

摘　　要：目的:建立下颌后牙单端固定桥及其支持组织的三维有限元模型,采用瞬态动力学分析,比较单端桥修复前后基牙骨支持组织的应力分布规律。方法:用ANSYS 10.0软件对模型施以不同部位和方向的冲击载荷,分析单端桥基牙骨支持组织的应力大小、分布及变化规律。结果:斜向载荷下,基牙骨支持组织存在明显应力集中;单端桥修复后,应力峰值77.676 MPa位于近缺隙侧基牙的皮质骨颈部;一个咀嚼周期末存在应力残余,其值不显著。结论:单端桥近缺隙侧基牙承受主要应力,载荷方向影响应力大小及分布,应力峰值小于下颌骨应变极限强度。AIM：To analyze the stresses induced in the supporting bone tissue of the fixed partial denture abutment in the mandible under transient dynamic loads.METHODS;A three -dimensional model was generated.Finite element analysis was performed on the model under dynamic loads in various directions and positions in a masticating cycle to study the magnitude and distribution of the stresses in the supporting bone of abutments.RESULTS：Oblique loads tended to produce more stress concentration.The peak stress value was 77.676 MPa at the neck of cortical bone with cantilever bridge.The residual stress in alveolar bone was not obvious in a masticating cycle.CONCLUSION;The stress on the abutment nearest to the pontic is the highest.The loading direction affects the magnitude and distribution of stresses.The peak stress value is less than the strain limit of mandible.

关 键 词：单端桥 牙槽骨 动态载荷 三维有限元法 应力 

分 类 号：R783.3[医药卫生—口腔医学]