下颌第一磨牙种植固定桥的受载分析

目的 观察下颌第一磨牙种植固定桥的位移和应力分布规律。方法 采用了三维有限元法进行受载分析。结果 发现第二双尖牙的最大位移值较大；由于固定桥的支架作用，垂直分散载荷下天然基牙和种植基牙的位移均值之间差异无显著性。基牙颈部为应力集中区，第二双尖牙根尖的应力较小。集中载荷加于基牙时，位移和应力值明显增加。结论 提示应注意末端种植基牙的载荷和咬合状态，该设计是临床可使用的特殊固定桥。

A study of load stress on an implant and a tooth supported fixed bridge for the first mandibular molar

Objective and Methods A study of load stress on an implant and a tooth supported fixed bridge for the first mandibular molar was performed by means of 3 D FEA in order to reveal the displacement and stress distribution.Results The results show that the maximum displacement of the second premolar is greater than that of the terminal implant, but there is no difference between the mean () under dispersed load statistically, due to the framework function of the bridge. The stress concentration appears around the neck of the abutments, on the contrary, a little stress is found around the apical portion of the second premolar. When the load concentrates on to the abutments, the displacement and stress value incease obviously. Conclusion The attention should be paid to the load and occlusion of the terminal implant. This kind of bridge design may be used in clinical practice.