[上前牙全瓷冠不同厚度的有限元应力分析]
[Finite element stress analysis of all-ceramic crown of the upper central incisor in differential thickness].
作者信息
Hu Jian, Zhang Feimin, Dai Ning, Li Shuanggao, Gu Weiping, Ma Junchi
机构信息
Institute of Stomatology, Nanjing Medical University, Nanjing 210029, China.
出版信息
Hua Xi Kou Qiang Yi Xue Za Zhi. 2012 Aug;30(4):356-9.
OBJECTIVE
To investigate the stress distributions under load in an all-ceramic crown of the upper central incisor in differential thickness.
METHODS
The 3-dimensional finite element model of all-ceramic crown of the upper central incisor in differential thickness was applied with differential loads (100, 150, 200 N). The stress values and distributions of all-ceramic crown were calculated and expressed.
RESULTS
The tendency of stress distributions in all-ceramic crown of differential thickness and loads was similar. The maximal stress intensity value was located in the loading site and the cervical region. As the thickness of all-ceramic crown increased, the stress concentration reduced. When the load increased, the stress values increased, especially in the loading site and the cervical region.
CONCLUSION
The increasing of the thickness of all-ceramic crown will decrease stress concentration. Because stress concentration is mainly in cervical region and loading site, these regions should be cared in fabrication of all-ceramic crown.
目的
研究不同厚度的上颌中切牙全瓷冠在加载情况下的应力分布。
方法
应用不同厚度的上颌中切牙全瓷冠三维有限元模型，施加不同载荷（100、150、200 N）。计算并表达全瓷冠的应力值及分布情况。
结果
不同厚度和载荷下全瓷冠的应力分布趋势相似。最大应力强度值位于加载部位和颈部区域。随着全瓷冠厚度增加，应力集中减小。当载荷增加时，应力值增大，尤其是在加载部位和颈部区域。
结论
全瓷冠厚度增加会降低应力集中。由于应力集中主要在颈部区域和加载部位，在全瓷冠制作过程中应关注这些区域。
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