美觀矯正線機械強度與浸泡測試之研究與探討

中文摘要隨著時代演進，大家對於美觀的要求是越來越高；不但希望藉由作矯正來讓自己的笑容更好看，而且還希望在矯正過程中依然保持不須妥協的笑容，所以美觀矯正線慢慢受到大家的重視。除了美觀的優點之外，在之前的多篇研究中指出，矯正線的表面塗層可以有效的抑制鎳離子的釋放，減少過敏的機會，因此矯正線的塗層應該是有很多好處。可是在一個新產品臨床普遍使用之前，我們應該先了解其特性；因此本篇研究的目的，在於探討經表面處理之後的矯正線材料，其機械性質是否有所改變。在本篇研究中我們利用萬用試驗機作拉伸試驗，比較經過表面塗層的鎳鈦矯正線跟傳統沒有塗層的鎳鈦矯正線的機械強度。另外利用浸泡試驗，模仿線材在患者口中的情形，查看經過21天的人工唾液浸泡，加上刷牙的磨耗之後，矯正線表面的塗層脫落的情況。拉伸試驗的測量結果顯示，表面塗層並不會影響線材本身的機械強度，有塗層的線與沒有塗層的鎳鈦金屬線並無顯著差異。而在荷重-位移曲線圖中，有塗層的線與沒有塗層的鎳鈦金屬線極相似。可是在浸泡試驗中，環氧樹脂塗層的矯正線，會因為刷牙的磨耗產生塗層脫落，鐵氟龍塗層的矯正線相對比較不易產生塗層脫落。由本實驗結果可知，矯正醫師使用有塗層的矯正線，不會影響矯正治療效果；但為達成患者美觀的要求，則需進一步研發不會脫落的塗層材料。

AbstractAs time goes by, esthetic issue becomes more and more important. People want to get a perfect smile via orthodontic treatment, but they prefer wearing an invisible or tooth- color appliance. Recently the esthetic orthodontic wires become more popular and get more attention! Besides esthetics, other merits were cited in previous studies. One of them is the prevention of corrosion of Ni-Ti wires by surface coating, and thus preventing Nickel ion release. Therefore, it would reduce the possibilities of Nickel hypersensitivity. Although the esthetic wires have some advantages, we still have to know more about their characteristics before widely clinical use. The main purpose of this study was to investigate the mechanical strength of the coated Ni-Ti wires after surface modificatiobn.Universal test machine was used to measure the tensile strength of coated Ni-Ti wires. Second, using artificial saliva to imitate the oral situation, immersion test was applied for 21 days to discover wether the coating would peel off after immersion and friction of brushing. The result showed that there was no statistic difference between coated wires and uncoated conventional wires in tensile strength, and the load-displacement curve of both wires looked simliar. The coating has no effect on mechanical strength of the base wires. However, after 21-day immersion test, the epoxy resin coatings were peeled off more easily than teflon coatings under friction and brushing. The orthodontist may achieve the same expected treatment result with new esthetic wires. But the prevention of coating peeling off needs further study.