Methods:The color of 150 maxillary incisors and its metal ceramic restorations was measured by MinoltCR 321 chromaticity instrument(D65 daylight simulator inside),the color reproduction ratio was calculated with CIE 1976 L*a*b* system.

• 方法 :用美能达 CR- 32 1色差计 (D6 5光源 )以 CIE1976 - L* a* b*色度系统分别对 15 0个上颌中切牙及其金瓷修复体色度值进行测色、计算色彩复现率并进行统计。