Development of new dental Ceramic corermy natural tooth Color

天然牙齿的颜色受种族背景、年龄、性别和漂白经历的影响，表明了一个巨大的色彩空间。本研究的目的是开发在陶瓷冠上再现天然牙颜色所需的新的客观色序。首先，我们使用分光光度计测量了包括四个种族背景的500名受试者的上颌中切牙，包括高加索人、西班牙人、非裔美国人和亚洲人，并定义了天然牙的颜色空间。其次，我们通过视觉评价和计算机评价(CCS：计算机色彩搜索)两种方法，从90个常规比色器中确定了所需的比色卡(CCS选项卡)。然后指出了比色板与天然牙的颜色差异。CCM标签是针对传统比色板没有覆盖的牙齿颜色而制造的。计算了由36种CCS标签和16种CCM标签组成的52种阴影标签的颜色深度，即代表颜色的单一指数，并根据颜色深度值对这些阴影标签进行编号。该色序由52种色标组成，涵盖了天然牙颜色，是一种新发展起来的能够客观评价天然牙颜色的色序。根据本研究的结果，可以说，结合牙齿颜色测量的三个步骤：CCS；计算机颜色搜索和CCM；计算机颜色搜索，是一种新的自然牙齿颜色再现方法。

Natural tooth color is affected by the ethnic background, age, gender and bleaching experience and indicates a huge color space. The purpose of this study to develop the new objective color order that is required for reproducing natural tooth color on the ceramic crown.First of all, we measured upper central incisors of 500 subjects including four ethnic backgrounds ; Caucasian, Hispanic, Afro-American and Asian using a spectrophotometer, and defined the color space of natural tooth. Second, we clarified the necessary shade tabs (CCS tab) out of 90 pieces of the conventional shade guides by two methods of visual evaluation and computerized evaluation (CCS : Computer Color Searching). Then, the color discrepancy between shade guides and natural tooth was indicated. CCM tabs were made for the tooth color that was not covered by the conventional shade guides. Color depth that is the single index representing the color was calculated for 52 kinds of shade tabs consisting of 36 kinds of CCS tabs and 16 kinds of CCM tabs, and these shade tabs were numbered according to the value of color depth. This color order consisting of 52 kinds of shade tabs covering natural tooth color is the newly developed color order that makes it possible to evaluate the natural tooth color objectively.Base on the results of this study, it could be said that methodology combined with three procedures of the tooth color measurement, CCS ; Computer Color Searching and CCM ; Computer Color Searching, is the new color reproducing methodology for the natural tooth color.