With the help of a portable Minolta-CR 100 colour difference meter,measurement of upper incisors' surface colour was for the first time domestically carried out in 100 young and middle-aged Shanghai residents,and their mean parameters were also determined.Our method was met he requirements of CIE1931 XYZ surface colour system as well as that of CIE1976 L*a*b* surface colour system.The meter has a quality of high accuracy and the figures thus obtained are concentrated and representative.
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