Finite Element Stress Analysis of Reconstrcuted Operation on Mandibular Defects in the Anterior Region

• Main Authors: Shih-WeiLu, 盧仕偉
• Other Authors: Ching-Hwei Chue
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/53701139714690234404

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 98 === The purpose of this paper is to establish a three-dimensional finite element model of operation on mandibular defects in the anterior region and to discuss the influence of stress distribution between different reconstructed methods. We provide a comparison when the mandible is reconstructed at different positions by using the graft bone or titanium plates. In the same boundary conditions and material properties, the effect of applying bilateral bite forces is discussed as it is compared with the case of unilateral bite force. The stress distribution of the titanium plate is also investigated when the mandible is reconstructed by using two titanium plates. The results show that the stress shielding effect at the fillet regions of graft bone in the bottom reconstructed cases is obvious as it is compared with the middle reconstructed cases. When the mandible is reconstructed with the titanium plate only, the equivalent stress for the anterior surface and fillet regions of titanium plate in the bottom reconstructed cases is smaller than in the middle reconstructed cases. Comparing with one titanium plate, the equivalent stress at the fillet regions of titanium plate can be reduced by 40~50% if the two titanium plates are used. In conclusion, we suggest that the reconstructed case of operation by using the graft bone is designed at middle position. And if the mandible is reconstructed by using one titanium plate, we suggest that the titanium plate is designed at bottom position. In the all reconstructed cases of operation, the maximum equivalent stress for the titanium plate almost occurs near the connection of mandibular defects and graft bone. Stress can be reduced by enlarging cross-section size of the titanium plate along width or thickness direction.