3种不同光源对金瓷修复体颜色的影响

The color differences of metal ceramic restorations in three different light sources

目的:比较在日光色、冷白色和暖色3种不同光源下金瓷修复体之间及其与Vitapan classical比色板的色彩差异。方法:应用CIE1976L*a*b*颜色系统,采用高像素数码摄影及计算机处理技术,在中性灰背景下,采集3种光源下2组金瓷修复体的12件试件与6件Vitapan classical比色板A2比色片的图片,分别测量、分析其色度值。结果:同种金瓷修复体在3种不同光源之间的色度差明显大于1.5个NBS单位;在日光色光源下金瓷修复体与比色片的色度差最小。结论:3种不同光源下金瓷修复体之间及其与VITA比色板存在肉眼可见的颜色差异,日光色光源要优于其他两种。

Objective：To study the color differences of metal ceramic restorations and Vitapan classical shade guides in daylight-color,cool white and warm light sources.Methods：On the neutral gray background,CIE1976 L＊a＊b＊ color system,a digital camera and computer were selected to measure and compare the characteristics of A2 shade slice in the shade guides and two groups of metal ceramic restorations in three different light sources.Results：To the same group of metal ceramic restorations,the color differences were more obvious than 1.5NBS in three different light sources.The color difference between metal ceramic restorations and A2 shade slice was the most insignificant in the daylight-color light source.Conclusion：Color differences could be found between the shade guides and metal ceramic restorations in three different light sources.Daylight-color light source is better than the other two for the colorimetric.