【摘要】 目的研究指定位移约束对颌骨的应力分布影响。方法建立一个实用局部模型 ,采用三维有限元分析法 (FEM) ,计算此模型在不同指定位移情况下的各节点的应力和位移。结果种植体周围骨组织的应力沿种植体轴线对称分布 ,在皮质骨层应力值很大 ,在孔底部分松质骨层应力值较小 ;应力值大小与指定位移大小呈正比的线性关系。结论在研究和预估测种植体周围颌骨组织内应力分布时 ,指定位移是一个不可忽略的因素更多还原

【Abstract】 Objective To study stress distribution in jawbone tissues around dental implant under displacement constraints. Method A local and ideal model was constructed. According to the anatomic structure of jawbone, the top and the bottom part of the model were assigned to cortical bone and cancellous bone properties respectively. Stresses and displacements of all nodes of this model under various displacement constraints were computed with finite element method (FEM). Result It was found that stress distribution was symmetric with the axis of dental implant and these stresses decreased with the distance increase off axis of these studied points. The maximal stress occurred on the cortical bone and the minimum was located on the bottom of the cavity where cancellous bone tissues predominating. The stresses were directly proportional to the magnitude of displacement constraints. Conclusion Displacement constraint is an important factor and can not be ignored in analysis and evaluation of stress distribution in jawbone tissues.更多还原