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題 名 | 局部鷹復體人工植牙型式之應力分析=Stress Analyses of Dental Prostheses with Various Implant Supported Design |
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作 者 | 黃恆立; 張志涵; 柯慶昌; 林峻立; 黃振勳; | 書刊名 | Journal of Medical and Biological Engineering |
卷 期 | 22:增刊 民91.12 |
頁 次 | 頁S17-S24 |
分類號 | 416.96 |
關鍵詞 | 局部贗復體人工植牙; 過度負荷; 有限元素分析; Dental implant-supported partial prostheses; Overload; Finite element model; |
語 文 | 中文(Chinese) |
中文摘要 | 人工牙根周圍齒槽骨流失是造成局部贋復體人工植牙植入後失敗的主要現象,由咬合力所造成之過度負荷乃是導致骨質流失重要原因之一,曾有學者提出改變人工牙根排列的型態可以降低齒槽骨之受力,目前此方式之臨床效果與生物力學的機制仍不是十分清楚。本研究的目的是要建立一精確的局部贋復體人工植牙的三維有限元素模型,探討(1)不同咬合型態下、(2)不同植牙型態(in-line以及off-line)下,對人工牙根本身及周圍骨組織所產生的影響。結果指出齒尖處承受-斜向咬合力會比齒窩處承受-垂直向下的咬合力得到高的應力值分佈,顯示不同咬合型態對局部贋復體人工植牙的應力分布有明顯的影響。在與in-line implants的比較下,改用off-line implants植入方式並無法有效降低人工牙根周圍齒槽骨的高應力值,此結果與之前學者之研究有所不同,其差異在於之前學者之研究並無將下顎骨之幾何外型的因素考慮在內,因此下顎骨幾何外型對局部贋復體人工植牙之植牙型態的效果應有重要影響。本研究之結果可對不同植牙型態的局部贋復體人工植牙在基本力學傳遞機制與應力分佈上有較完整的認識,期望提供此方面在臨床治療上的參考。 |
英文摘要 | The major failure of implant-supported dental partial prostheses was associated with the alveolar bone loss, which was though to have been induced by overload at bone around the implants. Some studies have indicated that change alignment of implants would reduce the overload status at alveolar bone. However, the biomechanical effect of this approach is still unclear. The purposes of this study were to investigate the effects of (1) types of the bite forces, and (2) the alignment (in-line and off-line) of the implant-supported partial prostheses. Three dimensional finite element models were constructed with the computed tomographic (CT) images of a human mandible and integrated with solid models of cylindrical dental implants to simulate the virtual implantation. The result showed that the bite force plays an important role in the evaluation of implant-supported partial prostheses and oblique force direction was more crucial than vertical bite force. Using off-line implant alignment alone did not always decrease stress values. This phenomenon was different with previous studies which neglect the influence of mandibular geometry. These outcomes suggested that a complicated interaction between the implant alignment and geometry of mandible. In this research, the outcome of these analyses could provide complete stress distribution of various designs of implant-supported partial prostheses which should offer the biomechanical rational of the structure and supply valuable information for clinical reference. |
本系統中英文摘要資訊取自各篇刊載內容。