臺灣博碩士論文加值系統

本實驗乃是比較不同鎳鈦合金矯正線材的力量-形變關係。選取了23組不同的材料、形狀與粗細的鎳鈦合金矯正線各10條，在37℃的溫度下，以三點彎曲試驗來測試其機械性質。從實驗結果可得到以下結論：
1. 從力量-形變圖中，我們得知 Nitinol clasic與 Nitinol SE在其特性曲線中不具有明顯轉折點，乃因此二者為硬化加工成形而不具超彈性特性，故其特性曲線中不具有明顯轉折點。
2. 同一廠商相同形狀與截面積的鎳鈦合金矯正線，含有銅成份的鎳鈦合金矯正線，在受力形變與放力而恢復原狀的過程中，其能量滯墜確實低於不含銅成份者，但是有例外，例如0.016的圓線其相互之間便無統計學上的顯著差異。
3. 對相同材質與相同相轉換溫度的鎳鈦合金矯正線而言，截面積愈大者，在放力而恢復原狀的過程中，所能釋放出的能量愈大，但是有例外，例如0.016×0.022與0.017×0.025的Copper NiTi40方線之間以及0.016與0.018 的Copper NiTi27圓線之間，這兩組數值並無統計學上的顯著差異。
4. 針對放力曲線而言，在2mm、1.5mm與1mm形變時，0.017×0.025 Copper NiTi40方線與0.016×0.022 Copper NiTi40方線以及0.016 Copper NiTi35圓線所釋出的力是最小的。在2.5mm形變時，0.017x0.025Copper NiTi40方線、0.016 Copper NiTi35圓線、0.018 Copper NiTi35圓線、0.016x0.022 Copper NiTi40方線、0.018 Copper NiTi27圓線所釋出的力是最小的一組。而不論在2.5mm、 2mm、1.5mm或1mm形變時，0.017×0.025 NiTi方線皆為釋出力最大者。以上皆有統計學上的顯著差異。
5. 從各類鎳鈦合金矯正線，其放力曲線的力量與形變數值比較中，我們發現截面積小的鎳鈦合金矯正圓線其釋放出來的力未必比截面積大的其它種類鎳鈦合金矯正方線來得小；同理，截面積較大的鎳鈦合金矯正方線所釋放出來的力也未必比截面積小的其它種類鎳鈦合金矯正圓線來得大。
目前市場上充斥著各式各樣的鎳鈦合金矯正線材，因為其具有超彈性與形狀記憶等特性，矯正醫師在臨床操作時不易預估牙齒所受到的力，為了更進一步的預估牙齒在矯正過程中所受到的力，因此選取了數種目前市場上常見的鎳鈦合金矯正線材，在模擬臨床狀態的三點彎曲實驗模式下，測量在受力與放力的過程中，力量與形變量的關係，藉由本實驗結果，將能讓矯正醫師對鎳鈦合金矯正線的機械性質能有近一步的了解，而在臨床操作上若要選擇釋出合適矯正力的鎳鈦合金矯正線材時，能夠有一客觀的參考標準。

The purpose of this study was to compare the load-deflection characteristics among several nickel-titanium arch wires. In the study , 10 specimens each of 23 different nickel-titanium alloy orthodontic wires with varying sizes and brands were selected to evaluate the mechanical properties by conducting three-point bending test in 37℃ water bath. The following results were obtained :(1) Nitinol clasic and Nitinol SE , the work-hardened nickel-titanium wires, did not show significant deflection point in the force-deflection diagram. (2) For the nickel-titanium wires from the same manufacturer with the same cross-sectional dimension, the copper component decreased the energy lost, except the 0.016 inch round wires. (3) For the same brand nickel-titanium wires, greater cross-sectional dimension wires would store higher energy, with the exception of 0.016x0.022 inch and 0.017x0.025 inch Copper NiTi40, and 0.016 inch and 0.018 inch Copper NiTi27. (4) At 2.5 mm deflection in the deactivation curve, 0.017x0.025 inch Copper NiTi40, 0.016 inch Copper NiTi35, 0.018 inch Copper NiTi35, 0.016x0.022 inch Copper NiTi40, and 0.018 inch Copper NiTi27 released the lowest deactivation force. At 2 mm, 1.5 mm and 1 mm deflection in the deactivation curve, 0.017x0.025 inch Copper NiTi40, 0.016x0.022 inch Copper NiTi40 and 0.016 inch Copper NiTi35 released the lowest deactivation force. On the contrary, the wires of 0.017x0.025 inch NiTi released the highest deactivation force at 2.5 mm, 2 mm, 1.5 mm and 1 mm deflection. (5) The results of this study included that the general concept did not necessarily hold true for that the deactivation force is not proportionally corrected with the cross-section of the NiTi alloy wire.

誌謝…………………………………………...1
題目…………………………………………...3
中文摘要………………………………………4
英文摘要………………………………………6
前言……………………………………………7
文獻回顧………………………………………9
研究目的……………………………………..14
材料與方法…………………………………..16
結果…………………………………………..20
討論…………………………………………..26
結論…………………………………………..40
參考文獻……………………………………..42
圖表…………………………………………..48

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