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目的研究广东省6～15周岁人群牙齿钙化的规律,建立根据牙齿钙化程度推断未成年人年龄的方法。方法观测2 710例(男性1 363例,女性1 347例)广东省6～15周岁汉族人全口曲面断层影像片,对其下颌牙齿钙化程度进行评分分级,所得数据经SPSS软件统计分析,建立根据牙齿钙化程度推断年龄的方程,并以100例(男60例、女40例)研究外样本进行盲测。结果数据统计显示,两侧同名牙钙化评分分级值的差异无显著性意义(P>0.05),而性别间差异有显著性意义(P<0.05);下颌单侧8颗牙齿的钙化评分分级值与年龄相关系数(r)女性为0.552～0.759,男性为0.672～0.838;所建回归模型拟合优度(R2)均在0.7以上,估计值标准误男性为0.91～1.11岁,女性为0.92～0.98岁;盲测推测年龄与真实年龄平均误差男性为0.429±0.282岁、女性为0.399±0.252岁。结论本研究所建方法推断结果准确可靠,可用于广东地区6～15周岁人群年龄推断。
Objective To study the regularity of tooth calcification in 6 ~ 15 years old population in Guangdong Province and to establish a method to infer the age of juvenile under the condition of tooth calcification. Methods A total of 2 710 Han Chinese people aged 6-15 years old in Guangdong Province were enrolled in 2 710 (1 363 males and 1 347 females) scans. The calcifications of mandibular teeth were graded and scored. The data obtained were statistically analyzed by SPSS software The age equation was deduced from the degree of tooth calcification. Blind measurements were performed on 100 samples (60 males and 40 females) of the study sample. Results The data showed that there was no significant difference in grading of dental calcifications on both sides (P> 0.05), but there was a significant difference between the sexes (P <0.05). Calcification score of 8 teeth The correlation coefficient (r) was 0.552-0.759 for women and 0.672-0.838 for males. The goodness of fit (R2) of the regression model was above 0.7, the estimated standard error of males was 0.91 to 1.11 years, and the female was 0.92 ~ 0.98 years old; the average error of blind speculation between age and true age was 0.429 ± 0.282 years for males and 0.399 ± 0.252 years for females. Conclusions The inferred results of this method are accurate and reliable and can be used to infer the age of 6 ~ 15 years old population in Guangdong.