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目的:探讨不同桩核材料对全瓷冠应力分布规律的影响,为临床修复设计提供依据。方法:利用螺旋CT断层图像,构建上颌第一磨牙舌侧1/2缺损桩核及全瓷冠修复的有限元分析模型,设计垂直集中载荷600N的加载方式,利用ANSYS软件分析全瓷冠的最大张应力和von mises应力值。结果:全瓷冠的von mises应力和最大张应力均集中于载荷加载部位,并呈放射状向周围递减,von mises应力的集中区域向颊侧方向延伸。结论:桩核材料弹性模量不同对全瓷冠的应力分布影响较大,临床上应根据牙体缺损情况选择桩核材料。
Objective: To investigate the effect of different post-core materials on the stress distribution of all-ceramic crowns, and provide the basis for the clinical repair design. Methods: The finite element model of the defect of the maxillary first molar with 1/2 defect and the all-ceramic crown restoration was constructed by using spiral CT tomography. The loading mode with a vertical concentrated load of 600 N was designed. The maximum of all ceramic crowns was analyzed by ANSYS software Tensile stress and von mises stress values. Results: The von mises stress and the maximum tensile stress of the all-ceramic crowns were all concentrated on the load-loading site and decreased radially. The concentrated area of von mises stress extended to the buccal direction. CONCLUSIONS: Different elastic moduli of post-core materials have a great influence on the stress distribution of all-ceramic crowns. The post-core materials should be selected according to the dental defects.