Vita MK Ⅱ切削陶瓷的颜色分析

Color Analysis of Vita MKⅡ Machinable Ceramic

采用视觉观察和仪器测量２种方法对ＶｉｔａＭＫⅡ切削瓷块的颜色（共５种）进行分析，结果显示：ＶｉｔａＭＫⅡ切削瓷块的颜色虽然不多，但基本位于Ｖｉｔａ烤瓷比色板的Ａ、Ｂ色系，具有较强的实用性。其颜色参数范围为：Ｌ＊（４２．０９～４７．０７）、Ａ＊（－１．４２～０．９６）、Ｂ＊（２．０８～９．６５），与Ｖｉｔａ烤瓷比色板及中国人牙的颜色范围相比，其颜色的明度不够，且缺乏高明度。

Visual observation with Vita shade guide and color measurement by spectraphotometer were used to analyze the five colors of Vita MKⅡ machinable ceramic and the results were described by CIE1976 L *A *B * color system. The results showed that most of the colors of Vita MKⅡ ceramic belonged to the A and B shade of Vita shade guide and is commonly seen in Chinese natural teeth , and the color ranges in CIE L *A *B * system were L *(42 09￣47 07), A *(-1 42￣0 96), B *(2 08￣9 65). The results suggest that compared with Vita shade guide and Chinese natural teeth, the color of Vita MKⅡ machinable ceramic is lack of red and yellow colors of high value and high chroma.