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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
Objective To understand the distribution of the color of the normal anterior crowns and the influence of sex and age on the color in the southwest of China. Methods Based on the color space CIE 1931XYZ and CIE 1976Lab, 1944 anterior teeth from 20 to 73 years old in Yunnan, Sichuan, Guizhou and other southwestern provinces were cut using human dental color measurement system. , Neck 3 measurement and analysis. Results ① The range of each color index of Chinese native teeth in Southwest China was: 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 to 0 392, and Y: 19 383 to 34 0 2 5. The color difference between the maximum and minimum 95% confidence limits is 31 6 6 7 CIEL a b ΔE units. ② Although there is a certain difference between male and female, there is no statistical significance (P> 0.05). ③ Except for the b value, the value of x is not significantly related to the age factor at the point of 1/3, while the other indicators are significantly related to the age at all sites (P <0.05). The values of L and a were negatively correlated with age (r <0, P <0.01). The brightness of the crown decreased with age, the color tended to be green, and the changes of the color of the middle, the neck and the neck were consistent. There was a positive correlation between b value and age (r> 0, P <0.01) with the age increasing. The color of 1/3 of the neck tended to be yellow, but the change of 1/3 was not significant (P> 0.05). Conclusion Chinese people in southwest China have a wide range of normal tooth color and no color difference of anterior tooth. Tooth color increases with age, brightness decreased, the teeth tend to be yellow, green, but yellow, blue in different parts of the inconsistent changes