三維有限元素法模擬微牙根植體在上顎骨靠近牙齒根部所產生靜態與動態應力分布行為之研究

Static and Dynamic Behaviors on Stress Distribution for A Mini-implant Close to The Roots of Adjacent Teeth in Maxilla Bone: A 3D Finite Element Analysis

陳筆仁(Tran, Viet Nhan)

指導教授 ： 江卓培

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2012年)

https://doi.org/10.6827/NFU.2012.00029

摘要

對於現代牙醫工程牙齒支架教正技術上，微型植體(mini-implants)支架是推廣使用且成功率可以提高的方法之一，使用微型植體(mini-implants)所進行的牙齒支架矯正術，可以成功的提高骨頭包含皮質骨與海綿骨對植入植體後所進行的骨整合效率。但使用微型植體(mini-implants)支架矯正術，所產生的骨整合和植體對牙槽骨之間的作用力與反作用力的相互關係，尚未被深入探討。因此、本研究目的在於利用有限元素模型(FEMS)來評估和分析微型植體(mini-implants)支架對其牙齒根部與骨整合之應力應變影響，用以修正微型植體(mini-implants)對其相鄰牙齒根部位置的應力分佈與微位移的影響。在材料的選擇方面、使用市面上所被廣泛運用之植體材料為鈦(Ti)與鋯(Zr)、比較兩種材料在鑲入同一個位置並進行靜態與動態負荷下的應力分析效應所造成骨整合的影響。
並且針對微型植體(mini-implants)所植入之位置進行探討其骨整合時，牙根所產生之應力與位移現象，藉此提供對用於微型植體(mini-implants)支架後所發生之現象，並且減少其支架鬆脫導致牙齒教正失敗的原因。最後本研究結果顯示在使用微型植體(mini-implants)支架教正時，如果將植體植入牙周膜且植體之螺紋部分崁入牙根表面是最理想的位置。

關鍵字

有限元素法 ； 微形植體 ； 生物力學

並列摘要

With the latest technology in dental implantology, mini-implants is the best way for denture problems. For the success rate improvement of mini-implants, the stress on the bone, the cortical bone and some parts relating to the mini-implant processing need to be investigated. The aim of this study was to evaluate stress in the bone when an orthodontic mini-implant closed to the roots of adjacent teeth using finite element models (FEMs). With two kind of mini dental implants were titanium and zirconia, the static, dynamic loading effects on the implants have been investigated and compared together. The results showed that the maximum von Mises stress of cortical bone concentrated in the compressed surface adjacent to the mini-implant and the maximum micromotion of mini-dental implant located at the neck in the all models. Stress and micromotion increased with the decreasing of cortical bone thickness and decreasing the distance of mini-implant to the root of tooth. In addition, the location of the implant was the significant factor related to failure of mini-implant anchorage. It suggests that the mini-implant should be avoid to be placed to the root proximity in the maxilla bone if the stability of mini-implant for orthodontic anchorage is in consent. This research showed the good position for mini-implant in the maxilla when the thread of mini-implant embedded in the periodontal membrane.

並列關鍵字

Finite element analysis ； Orthodontic anchorage ； Mini-implant ； Bone resorption ； Maxilla bone ； Biomechanics

參考文獻

[36] Huang. H. L., Chang. C. H., Hsu. J. T. , Fallgatter. A. M. and Ko. C. C., Comparison of implant body designs and threaded designs of dental implants: a 3- dimensional finite element analysis. Int J Oral Maxillofac Implants 2007 Jul-Aug;22(4):551-62.

[4] Adell. R., Hansson. B. O., Branemark. P.I. and Breine. U., Intra-osseous anchorage of dental prostheses.II. Review of clinical approaches. Scan J Plast Reconstr Surg 1970; 4: 19-34.

[5] Miyawaki. S., Koyama., Inoue. M., Mis. Hma. K., Sugawara. T. and Yamamoto. T., Factors associated with the stability of titanium screws placed in the posterior region for orthodontic anchorage. Amer J Orthodod Dentofac Orthop 2003: 124 : 373-378

[6] Motoyoshi. M., Hirabayashi. M., Uemura. M., Shimizu. N., Recommeded placement torque when tightening an orthodontic mini-implant. Clin Oral Impl Res 2006: 17: 109-114.

[7] Holmgren. E. P., Seckinger. R. J., Kilgreen. L. M. andMante. F., Evaluating parameter of osseointegrated dental implants using finite element analysis-a two dimensional comparative study examining the effects of implant diameter, implant shape, and load direction. J Oral Implantol 1998: 24 80-88.