【摘要】 目的　了解西南地区中国人正常前牙冠颜色的分布范围及性别、年龄对颜色的影响。方法　以CIE 1931XYZ、CIE 1976L a b 颜色空间为基础 ,采用人体牙齿颜色测量系统对 16 2名2 0～ 73岁出生地为云南、四川、贵州等西南省区人的 1944枚前牙进行切、中、颈 3个位点的测量分析。结果①西南地区中国人天然牙的各色度指标范围为 :L 42 383～ 6 7 42 8,a - 4 75 0～ 1 371,b 1 88～ 2 0 2 6 8,x :0 2 98～ 0 393,y:0 332～ 0 392 ,Y :19 383～ 34 0 2 5。 95 %可信限的最大值与最小值之间的色差值为 31 6 6 7CIEL a b ΔE单位。②男、女性别之间虽有一定差异 ,但无统计学意义(P >0 0 5 )。③除b 值、x值在切 1/ 3与年龄因素无明显相关外 ,其余指标在各个部位均与年龄因素呈明显相关 (P <0 0 5 )。④L 、a 值与年龄呈负相关 (r<0 ,P <0 0 1) ,随年龄增长牙冠明度下降 ,颜色趋于偏绿 ,且切、中、颈部位颜色变化一致。b 值与年龄呈正相关 (r>0 ,P <0 0 1)随年龄增长 ,中、颈 1/ 3颜色趋于偏黄 ,但切 1/ 3变化不明显 (P >0 0 5 )。结论　西南地区中国人的正常牙颜色范围较广 ,前牙颜色无性别差异。牙齿颜色随年龄增加 ,明度下降 ,牙齿趋于偏黄、绿 ,但黄、蓝色相在不同的部位变化不一致更多还原

【Abstract】 Objective To study the color distibution space of natural anterior tooth crowns of people in southwest China and effects of sex and age on tooth color. Methods The subjects studied consisted of 162 persons aged from 20 to 73 years a n d born in southwest China. A total of 1 944 healthy anterior teeth were meas ured in-vivo with a fiber-optical spectrophotometery system. Results Statistical analysis showed that the color distribution space of Chinese too th crowns was wide. The value of L* varied from 42383 to 67428, the va lue o f a* from -4750 to 1371, the value of b* from 188 to 20268, the val ue of x from 0298 to 0393, the value of y from 0332 to 0392, and the val ue of Y from 19383 to 34025. The color difference between the upper and lowe r limits of 95% confidence was 31667 CIE ΔE units. The difference in colorime try between male and female was not significant. The results showed that in thre e sections of teeth (incisal, middle and cervical) the values of L* and a* w ere negatively related to age (r<0, P<001); the value of b* was posi tively related to age just at the cervical and middle sites of teeth (r>0, P<001) and was not related to age at the incisal site of teeth (P>00 5). Conclusion The color distribution space of Chinese anterior tooth crowns is wide. There is no difference in the anterior tooth color betwee n male and female subjects. The values of L* and a* and negatively related t o age except the value of b*.更多还原