皮質骨厚度、植入角度、和材料組成應用於迷你骨釘初期穩定度之研究

Influence of cortical bone thickness, insertion angle, and material composition on the primary stability of miniscrews

何峻瑞(Ho Jun-Rui)

指導教授 ： 蔡吉陽

臺北醫學大學/口腔醫學院/牙醫學系碩博士班/碩士(2015年)

https://doi.org/10.6831/TMU.2015.00010

摘要

實驗目的
本研究主要目的為使用有限元素分析和共振頻率分析分別探討不同
皮質骨厚度，植入角度，和材料組成對於迷你骨釘初期穩定度的影響。
實驗方法
本實驗分為兩個部份，有限元素分析和共振頻率分析。有限元素分析：總共建構了八種有限元素模型來模擬迷你骨釘及骨釘周圍骨頭的生物力學行為特性，並進一步計算其周圍骨頭Von Mises應力和迷你骨釘對於周圍骨頭的相對位移。共振頻率分析：總共有八個實體模型來對應到有限元素的模型設計。每個模型分別有五組試驗樣本，因此總共分析了四十組迷你骨釘，並以雙因子變異數分析來探討各項因子的影響。
結果
有限元素模型的結果顯式不同材質對於周圍骨頭的應力，和骨釘骨頭之間相對位移有顯著性的差異。不同的植入角度僅對相對位移有明顯的差異，而不同的皮質骨厚度在本實驗中則對於周圍骨頭的應力和相對位移皆無顯著性的差異。在共振頻率分析中，上述三項因子對於迷你骨釘的初期穩定度都有明顯的影響。
結論
目前絕大多數市場上常見的迷你骨釘系統所使用的材質為純鈦或是鈦合金。在矯正治療中，使用不銹鋼的迷你骨釘可成為另一種新選項。共振頻率分析為一種實用、非侵入性，評估迷你植體穩定性的方式。仍須進一步的研究，而未來也許可成為輔助臨床醫師的一種工具。

關鍵字

迷你骨釘, 有限元素,

並列摘要

Objective
This study evaluates the influence of different cortical bone thickness, insertion angle, and compositions on the primary stability of orthodontic miniscrews using the finite element method and the resonance frequency analysis.
Methods
For the finite element method, eight finite element models were constructed to simulate the biomechanical response of the bone surround the miniscrew. Von Mises stress of the surrounding bone and the relative displacement between the miniscrew and the adjacent bone were calculated. For the resonance frequency analysis, a total of eight models corresponding to the FEA model were tested. Five identical specimens of each model were prepared. Therefore, a total of 40 miniscrew samples were analyzed. Two-way ANOVA analysis was preformed to calculate the comparative influence of each factor.
Results
The finite element model results showed that different miniscrew compositions contribute a significant influence to the surrounding bone stress and relative displacement. Insertion angles only have an influence to the relative displacement, while cortical bone thickness does not seem to affect both. Resonance frequency analysis show that all three factors have a significant influence to a miniscrews’ stability.
Conclusion
Currently, for orthodontic miniscrews, most well known systems are commercially available pure titanium or titanium alloy. The use of stainless steel as an orthodontic miniscrew can be another choice of temporary anchorage device(TADs) in orthodontic treatment. The resonance frequency analysis is a practical, noninvasive method to evaluate the stability of mini-implants. Further research is required, and it may be applied extensively to assist clinicians in the future.

並列關鍵字

miniscrew, finite element analysis

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