錨定對於牙齒矯正計畫的訂定有著深遠的影響，錨定的喪失會造成某些牙齒發生移動，進而影響整個矯正治療的結果。矯正用骨板可以提供齒列矯正時一個絕對的錨定力量使得整個治療更有效率，對於矯正的結果也更加能夠被預期。在使用矯正骨板時有些因素會影響到矯正骨板的成功率，這些因素包括骨板的型態、皮質骨的厚度、骨釘長度及植入的深度、力量的大小、力量的方向、骨釘的數目、以及骨頭本身的狀況。回顧過去研究，目前並沒有任何的研究針對這些影相因素做一個生物力學方面的探討。所以本實驗的目的，利用有限元素的方式對於這些可能影響矯正骨板的幾個因素做一個生物力學的探討和比較，並且比較骨板與骨釘生物力學的異同。最後分析結果，期望給臨床醫師在使用矯正骨板時的一個參考。實驗中，先收集相關臨床資料共計12位患者，分析其目的結果並利用這些資料建立分析模型及參考變數，隨後利用3D有限元素的方式來分析影響矯正骨板成功的因素。在模擬部分，參考臨床上可能的狀況先改變了幾個參數，包括骨板形狀、皮質骨的厚度、骨釘長度及數量、施力的大小及方向以及模擬臨床上骨板可能被彎折的狀況來觀察其對整個系統在應力及形變的差異。從模擬結果可發現各結構中應力都集中在接近骨釘的區域。在各變數中施力的方向是影響應力表現最重要的一個因素，施力方向平行骨板長軸時應力值最小，Y及T骨板在較I及L骨板有較佳的應力表現，應力隨著施力增大而等比增加，骨釘數量增加可降低最大應力值。在目前設定下骨釘長度及皮質骨的厚度的變化對於應力的變化並沒有決定性的影響。在與骨釘的比較中骨板為較佳的選擇，如果患者骨條件好且盡量減少骨釘露出的量，此時選用何種系統就沒有太多的差異性。另外根據研究及臨床運用，設定最常見的狀況：皮質骨厚度1.75mm以及6mm骨釘露出量，在這條件下選用骨板會有較佳的表現，尤其當施力平行於骨板長軸時差異性尤為明顯。根據實驗的結果，在選用骨性錨定時，施力方向、骨板種類的選擇會影響到應力的大小，而患者皮質骨條件及骨釘露出量決定臨床上骨釘或骨板系統的選擇

Anchorage plays an important role in the planning of tooth movement for orthodontic treatment. Unwanted tooth movement known as loss of anchorage can be a determinate effect on the treatment outcome. The bone plate can provide an absolute anchorage, and allow treatment to proceed more effectively with more predictable results. With bone plate as the orthodontic anchorage, some biomechanical factors could influence its success rate such as: type of bone plate, thickness of cortical bone, screw length, screw implanted depth, orthodontic force magnitude, force direction, screw number, and bone quality. Unfortunately, there were limited studies focused on these biomechanical factors. The purpose of this study is to analyze the biomechanical factors which influence the bone plate success rate by using finite element simulation. In this study, we collect the data form twelve patients who had bone plate as orthodontic anchorage to intrude teeth and move posterior teeth or full arch teeth distally at the NCKUH since 2004. Then, we set up the model and variation according to these data. The biomechanical influences of success factors on bone plate were quantified by using the three-dimensional finite element method (FEM). In the FEM analysis, we found that stress in all structure was concentrated around the screw. Different type of bone plate, different direction and magnitude of force, screw number and plate bending influenced the stress distribution. The screw length and thickness of cortical bone effect were not significant to influence the peak value of the stress. In comparing between miniscrew and bone plate, the bone plate system was better than miniscrew system, but if the patient had thick cortex with short screw exposure length there were no significant different between the two systems. The setting of miniscrew system used in maxillary with 1.75mm cortical bone and 6mm screw exposure length was closed to average situation and the stress in this setting was larger than bone plate system. According to this study, the force direction and the plate type influence the stress value and the cortical bone thickness and screw exposure length determinate what system should we chose

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