Discipline of Anatomy & Histology F13, The University of Sydney, Sydney, NSW 2006, Australia.
Forensic Sci Int. 2010 Jun 15;199(1-3):29-37. doi: 10.1016/j.forsciint.2010.02.025. Epub 2010 Mar 20.
Sex determination of juvenile skeletal remains is a problematic area affecting physical anthropology, forensic science and archaeology. Sexual dimorphism in the morphometric crown traits of the deciduous dentition may be used to help resolve this issue. Dental stone casts from a European derived Australian sample (n=151) were used to investigate variation within crown traits of the deciduous canine and molars. The metric traits investigated were crown size, trigonid size and talonid size. The morphological features included Carabelli's trait and molar cusp number. Metric crown traits were significantly larger in males (p<0.05). The morphological crown traits were not significantly different between the sexes. The largest degree of sexual dimorphism was 11.11% in the trigonid mesiodistal diameter of the first deciduous molar. This is the first recording of the measurement in a European derived sample. Two multivariate statistics, linear functional discriminant analysis and binary logistic regression, were used to determine the success rate of sex classification from the crown traits. The most suitable was linear functional discriminant analysis, however similar results were found when using binary logistic regression. When using all variables investigated in this study, sex could be classified with accuracy of 70.2% from linear functional discriminant analysis (cross validated). The mandibular teeth had greater sexual dimorphism, classifying sex correctly 74.8% of the time compared to maxillary variables that had a success rate of 55.6%. Our results have shown that morphometric crown traits in the deciduous dentition can be used to classify sex of juvenile skeletons (11 months to 12 years) of European descent from linear functional discriminant analysis with accuracy between 70.2% and 74.8%.
少年骨骼的性别鉴定是一个影响体质人类学、法医学和考古学的问题领域。在乳牙的形态学冠特征上的性二态性，可能被用来帮助解决这个问题。使用来自欧洲裔澳大利亚样本（n=151）的牙石铸型来研究乳牙的恒齿冠特征的变异。研究的度量特征包括冠大小、三角嵴大小和尖牙窝大小。形态特征包括 Carabelli 特征和磨牙尖的数量。男性的度量冠特征明显较大（p<0.05）。性别之间的形态冠特征没有显著差异。在第一颗乳牙的三角嵴近远中直径上，性二态性最大程度为 11.11%。这是在欧洲裔样本中首次记录到的测量值。使用线性功能判别分析和二元逻辑回归两种多元统计方法来确定从冠特征进行性别分类的成功率。线性功能判别分析是最合适的，但是使用二元逻辑回归时也发现了类似的结果。当使用本研究中调查的所有变量时，线性功能判别分析的准确率为 70.2%（交叉验证）。下颌牙齿的性二态性更大，正确分类性别的比例为 74.8%，而上颌变量的成功率为 55.6%。我们的结果表明，从线性功能判别分析来看，乳牙的形态学冠特征可以用于对欧洲裔少年骨骼（11 个月至 12 岁）进行性别分类，准确率在 70.2%至 74.8%之间。
