【摘要】 目的:研究不同形状和直径纤维桩核修复下颌第二前磨牙的应力分布。方法:分别在直径为根径的1/2、1/3、1/4和形状为柱形、锥形、梯形的玻璃纤维增强树脂桩核修复下颌第二前磨牙的三维有限元模型上,以垂直和斜向(45°)2种方式加载200N,应用Nastran软件进行三维有限元应力分析。结果:不论纤维桩核为何种形态,当其直径增大时,桩核及基牙的应力分布无明显变化;锥形桩和梯形桩在承受斜向加载时牙根最大应力峰值较垂直加载时牙根应力峰值的增幅最小。结论:纤维增强树脂桩核修复时锥形桩和梯形桩是较理想的设计。更多还原

【Abstract】 PURPOSE:To evaluate the stress distribution of mandibular second premolar restored with different shapes and diameters fiber post-core.METHODS:A load of 200N was distributed to the finite element model of mandibular second premolar restored with three different shapes(column post,cone post and trapezium post) and three different diameters(1/2,1/3 and 1/4 of root diameter) fiber post-core in vertical and lateral(45°) direction,and software of "Nastran" was applied to analyze the three-dimensional finite element distribution of stress respectively.RESULTS:Irrespective of the shapes,there was no significant change of stress distribution with the increase of post diameter.Under lateral load,the cone post and trapezium post created the least increased range of maximum stress than that under the vertical load.CONCLUSION:Cone and trapezium fiber posts are the more ideal designs to restore the residual crowns and roots.更多还原