本文利用有限元素軟體，建立重建後的下顎骨三維有限元素模型，在相同邊界條件與材料性質下，探討移植骨位置的選擇對分析結果的影響；鈦重建板移除後，對下顎骨所造成的應力遮蔽效應；移植骨高度值的變化對分析結果的影響；使用鈦板做初期重建時，板位置的選擇對分析結果的影響；以及調整板所造成的殘留應力分佈。以主應力與等效應力探討所有案例的受力狀況。
分析結果顯示，移植骨選擇在頂部的位置應力會最小；板移除後，最大的應力遮蔽現象出現在移植骨與下顎骨相連處；移植骨高度值愈小，應力愈大，應力遮蔽現象也愈大；初期重建時，板的位置在底部最好，但差異不大，綜觀所有結果後，仍建議選擇頂部的位置；調整鈦板時，最好避免逆時針調整，或降低調整的角度，以減緩疲勞破壞的發生。

The purpose of this study is to generate a three dimensional finite element model of the reconstructed mandible and to provide a comparison of mechanical responses for different positions and geometry of graft. The principal and von Mises stresses are computed to evaluate the effects of all influence factors on the integrated reconstructed structure. There exists the stress shielding effect on the mandible when reconstruct plate is removed. It is important to understand the influence of plate position on the stress distribution when the mandible is reconstructed by using the titanium plate. The residual stresses on the plate should also be considered when the fatigue failure is evaluated.
The results show that the stress in mandible can be deviated when the graft is located at upper position. The stress shielding effect occurs near the connection of mandible and graft when reconstructed plate is removed, especially when the graft is located at lower position. If the titanium plate is used, no differences in stress distribution are observed for upper, middle, or lower position where the plated is attached. In conclusion, we suggest that the graft is designed at upper position with or without titanium plate for reconstruct mandible. Before reconstructing surgery, the residual stress induced in the plate depends on the way how to bend the titanium plate. The result shows that the residual stress will enhance the fatigue possibility if the plate is bent counterclockwisely.

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