[全瓷冠不同外形设计的三维有限元应力分析]
[Three-dimensional finite element stress analysis of different designs of shape in all-ceramic crowns].
作者信息
Cheng Bihuan, Zhao Yunfeng, Wang Huarong, Zhang Jian
机构信息
West China School of Stomatology, Sichuan University, Chengdu 610041, China.
出版信息
Sichuan Da Xue Xue Bao Yi Xue Ban. 2003 Apr;34(2):265-6.
OBJECTIVE
The purpose of this study was to examine the effect of different occlusal thickness on the stress distribution of all-ceramic crowns of the mandibular first molar.
METHODS
Three-dimensional finite element analysis was made.
RESULTS
It was found that under the simulated applied loads, the values of tensile and shear stress varied with the occlusal thickness, and much greater values of such stresses were noticed in the all-ceramic crowns 1.0 mm in occlusal thickness, compared with those in the crowns 1.5 mm and 2.0 mm in occlusal thickness.
CONCLUSION
These results could serve as a theoretic foundation for the clinical application of all-ceramic crown, suggesting that the occlusal thickness of the crown should not be lower than 1.5 mm in order that the resistance of the all-ceramic crown against fracture might be strengthened.
目的
本研究旨在探讨不同咬合厚度对下颌第一磨牙全瓷冠应力分布的影响。
方法
进行三维有限元分析。
结果
发现在模拟加载条件下，拉应力和剪应力值随咬合厚度而变化，与咬合厚度为1.5mm和2.0mm的全瓷冠相比，咬合厚度为1.0mm的全瓷冠中此类应力值要大得多。
结论
这些结果可为全瓷冠的临床应用提供理论依据，表明为增强全瓷冠的抗折性，冠的咬合厚度不应低于1.5mm。
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