下颌后牙固定桥支持骨组织应力的三维有限元法分析：Ⅰ.固定桥 …

目的：研究下颌后牙固定桥基牙周围牙槽骨表面的应力状态。方法：以成人下颌骨为解剖学基础，建立固定桥及基牙支持组织的三维有限元模型。分别在６种垂直向载荷和１种水平向载荷条件下，计算出基牙周围牙槽骨表面的最大主应力、最步主应力值。结果：垂直向载荷下，应力集中在根尖和颈部牙槽骨，颈部主要为拉应力，根尖区均为压应力；双尖牙周围牙槽骨应力最大值约为的２．１倍；水平向载荷下应力明显增加，约为垂直向载荷的３．５倍

Three-dimensional finite element analysis of stress in supporting bone of mandibular posterior fixed bridge. I. Stress analysis of the surface of alveolar bone around bridge abutments]

OBJECTIVE: Stress levels of the surface of alveolar bone around bridge abutment of posterior fixed bridge were studied. METHODS: The three-dimensional finite element model was developed on the basis of a try adult mandible. 6 vertical and 1 horizontal loadings were applied respectively, and the Maximum stress(epsilon max) and the Minimum stress(epsilon min) of the surface of alveolar bone around bridge abutment were calculated. RESULTS: The stress concentration exhibited at the apical and cervical regions. The stress of the bicuspid was about 2.1 times as high as that of the molar. When transverse loading was applied, the stress level was about 3.5 times as high as that when vertical loading was applied. CONCLUSION: The results were greatly valuable to design of posterior fixed bridge.