下颌后牙固定桥支持骨组织应力的三维有限元法分析：Ⅱ.固定桥 …

目的：观察固定桥桥体下皮质骨应力的分布。方法：建立固定桥及其支持组织的三维有限元模型，分别在垂直向和水平向共６种载荷下，用三维有限元法计算出固定桥桥下上质骨的最大主应力和最小主应力值。结果：修复前缺牙区皮质骨存在极小的应力，固定桥修复后，应力有所增加，但仅为基牙牙槽骨应力的９．５％（垂直向载荷）和２．２％（水平向载荷）。结论：固定桥桥体下皮质骨的应力极小，固定桥所受的力绝大部分由基牙牙周支持组织承

Three-dimensional finite element analysis of stress in supporting bone of mandibular posterior fixed bridge. II. Stress distribution of the cortical bone beneath pontic of fixed bridge]

OBJECTIVE: Stress distribution of the cortical bone beneath the pontic of the fixed bridge was observed. METHODS: The three-dimensional finite element model was developed. 6 loadings were applied respectively and the Maximum Stress (epsilon max) and the Minimum Stress(epsilon min) of the cortical bone beneath the pontic of the fixed bridge were calculated. RESULTS: The stress values were very small before the bridge was inserted. After the bridge was inserted the stress increased, but the stress level in the cortical bone was much lower than that in the alveolar bone. The stress values of the cortical bone were only 9.5% (vertical loading) and 2.2% (horizontal loading) of the alveolar bone's. CONCLUSION: The stress value of the cortical bone beneath the pontic was very small. The load was born mainly by supporting tissue around the bridge abutment.