除了改善、探究材料的功能性以外，學者們發現人們對於材料的要求已不僅專注於其功能性，隨著生活水平的提升，人們開始更要求美觀的重要性。
以牙科使用鈦金屬而論，由於其優異的生物相容性、耐蝕性、且比重佳、配戴舒適等優點，使得牙科鈦金屬植體的臨床應用日益增多，然而發展至今隨著科技進步，人們對於假牙的要求已不僅專注於咀嚼、使用壽命…等功能，反而更要求美觀，也因而出現了陶瓷材料、高分子材料製成的假牙的多項研究發展，此二者與金屬假牙比較，其最大優點乃在於美觀性。
以探討使用在活動式假牙之金屬來說，鈦金屬較貴金屬、鈷鉻合金等，具有良好生物相容性、耐蝕性佳、重量輕、配戴舒適、X光可透射等優點，因此作為義齒和植體的開發逐漸增多，然而其金屬顏色外觀仍有改善空間。為了擁有鈦金屬的機械性質，且使鈦金屬外表顏色更能在口腔牙齒中匹配，本實驗參考了微弧氧化處理法和陽極處理法，許多研究已指出，對於鈦金屬的微弧氧化處理和陽極處理法可形成各種顏色的氧化層，研究參數主要有不同電解液、電解時間、電解質濃度、初始粗糙度、工作電壓、工作電流，隨著不同參數形成的氧化膜具有各種光譜中的顏色，同時考量到該方法的低成本優點，無疑為功能性和美觀的外在開拓一條新的道路。
本研究目的是以微弧氧化處理使純鈦表面發色期許達到顏色均勻且和自然牙之色度進行比較，同時也討論了陽極氧化法，可得到不同於微弧氧化處理之多色系氧化層，期許達到顏色均勻且與口腔協調性較高的黃、紅色，進而達到美觀和功能性的應用可能，此後使用DC數位相機進行數位比色、膜層厚度分析、粗糙度測試分析、以SEM分析其表面微結構推論成色機制，並以EDS分析表面元素此外 ，以分光光譜儀測量不同處理條件下的發色鈦金屬之色度值，並將其與自然牙冠、牙齦和商用樹脂間的色差比較，並評估將其浸泡在不同的溶液中之色度變化，探討其顏色的耐久性。

Micro-arc oxidation (MAO) is a novel surface engineering process for titanium and its alloys. In an electrolytic tank with high electric energy, the dense and hard ceramic oxide coating can be formed on pure titanium surface during the process. Owing to its simplified process, good corrosion resistance performance and cost consideration, MAO technology has emerged as an important role, and it could be an alternative to anodizing treatment, and it may also be beneficial in prosthetic dentistry.
In this study, our research is to develop a method to form the bright, uniform, smooth, and white coating on pure titanium metal surface by micro-arc oxidation treatment, and it is expected to be useful in denture field, by improving the aesthetics of titanium in the oral cavity. Besides the white color, this method could also formed the special micro-structure on titanium surface which may effect the outward appearance. During the surface treatment process, the surface color of the pure titanium were mainly affected by many factors such as surface roughness, coating thickness, electrolyte composition, concentration, oxidation time, and applied voltages.
The present study discusses influence of the above mentioned parameters on the color development of the oxide layer and analyzed the oxide film’s color compositions, micro-structure by the SEX and EDS. In addition, we use the standardized shooting method which is recommended by CIEL*a*b* to implement the colorimetric, and compare the color difference between the titanium with white film and the natural tooth and gingival tissues by chromatic values in CIE L*a*b* color space, thereby obtaining the better aesthetic appearances. Finally, the samples will be immersed in different solutions to test the durability of its color.

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