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目的建立利用牙齿钙化程度推断未成年人年龄的方法。方法选取河南省安阳市1 575名(男性900名,女性675名)6～15周岁人群的全口曲面断层影像片,依照牙齿钙化分级标准对下颌恒牙钙化程度进行评分分级;所得数据经SPSS 13.0软件统计分析,建立根据牙齿钙化程度推断年龄的方程;采用拟合优度检验、模型方差分析、回归系数检验和共线性诊断、残差分析对方程的合理性进行检验及盲测。结果下颌同名牙间钙化分级评分值无统计学差异(P>0.05),而下颌同名牙性别间钙化评分值在部分年龄组存在差异(P<0.05);下颌恒牙的钙化程度与年龄相关系数r均大于0.7;所建方程模型调整决定系数均大于0.8,估计值标准误男性为0.92岁至1.04岁、女性为0.92岁至1.00岁;推测年龄与真实年龄的平均误差男性为0.433±0.288岁、女性为0.502±0.297岁。结论本研究建立的方法在推断相关地区、相关年龄段人群的年龄推断中有较好的应用前景。
Objective To establish a method to infer the age of minors by using the degree of dental calcification. Methods The total mouth curved images of 1 575 (900 males and 675 females) aged 6 to 15 years in Anyang City of Henan Province were collected. The calcifications of mandibular permanent teeth were graded according to the criteria of dental calcification. The data were analyzed by SPSS 13.0 Software statistical analysis, the establishment of the equation based on the age of the tooth calcification; using goodness of fit test, model analysis of variance, regression coefficient test and collinearity diagnosis, residual analysis to test the validity of the equation and blind test. Results There was no significant difference (P> 0.05) in the grade of calcification between mandibular teeth, while the value of calcification score between mandibular teeth in the same name was different in some age groups (P <0.05). The degree of calcification in mandibular permanent teeth was positively correlated with age-related coefficient r were all greater than 0.7; the established equation model adjustment decision coefficients were greater than 0.8, the standard error estimates of males from 0.92 to 1.04 years, females from 0.92 to 1.00 years; presumption of age and true age, the average error of male 0.433 ± 0.288 years And 0.502 ± 0.297 years in women. Conclusion The method established in this study has a good prospect of application in inferring age-related population in the relevant areas and related age groups.