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研究生:謝豐祺
研究生(外文):Feng-Chi Hsieh
論文名稱:缺損下顎骨重建手術之有限元素分析
論文名稱(外文):Finite Element Analysis of Reconstructed Defect Mandible
指導教授:褚晴暉褚晴暉引用關係
指導教授(外文):Ching-Hwei Chue
學位類別:碩士
校院名稱:國立成功大學
系所名稱:機械工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:59
中文關鍵詞:下顎骨移植骨鈦重建板疲勞殘留應力應力遮蔽
外文關鍵詞:stress shieldinggraftresidual stressmandiblereconstruct platefatigue
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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.
摘要 ...............................................Ⅰ
英文摘要 ...........................................Ⅱ
致謝 ...............................................Ⅲ
目錄 ...............................................Ⅳ
表目錄 .............................................Ⅶ
圖目錄 .............................................Ⅷ
符號說明 ...........................................XI

第一章 緒論.........................................1
1.1前言.............................................1
1.2文獻回顧.........................................3
1.3研究動機與目的...................................6
1.4本文架構.........................................6
第二章 理論與分析方法...............................7
2.1醫學介紹.........................................7
2.1.1下顎骨構造.....................................7
2.1.2肌肉系統.......................................8
2.1.3下顎骨重建手術.................................10
2.2有限元素法.......................................13
2.2.1結構分析.......................................13
2.2.2接觸分析.......................................14
2.3應力與應變關係...................................16
2.3.1等向性材料之應力應變關係.......................17
2.3.2橫向等向性材料之應力應變關係...................18
2.4 Von Mises 降伏準則..............................20
2.5主應力 ..........................................21
2.6應力遮蔽效應.....................................21
第三章 有限元素模型建立………….....................22
3.1座標系統定義.....................................22
3.2有限元素模型建立.................................24
3.2.1 電腦斷層掃描圖(computer tomography,簡稱CT) ..24
3.2.2 下顎骨之有限元素模型建立 .....................25
3.2.3鈦板之有限元素模型建立.........................28
3.3材料性質.........................................32
3.4邊界條件.........................................35
第四章 結果與討論...................................37
4.1 定義特定節點位置................................37
4.2 移植骨位置對下顎骨應力值的影響..................39
4.3 保留鈦重建板之下顎骨應力分析....................42
4.4 移植骨高度變化對應力的影響......................45
4.5 使用鈦重建板初期重建之應力分析..................48
4.6 殘留應力 .......................................52
第五章 結論 ........................................55
參考文獻 ...........................................57
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