Shankar S, Anuthama Krishnamurthy, Kruthika M, Kumar V Suresh, Ramesh K, Jaheerdeen A, Yasin M Mohamed
Department of Public Health Dentistry, KSR Institute of Dental Science and Research, KSR Kalvi Nagar, Thokkavadi (PO), Tiruchengode 637215, Tamilnadu, India.
J Forensic Leg Med. 2013 Aug;20(6):752-6. doi: 10.1016/j.jflm.2013.04.009. Epub 2013 May 29.
Anthropological research relies on skeletal and dental remains for the identification of species. Sexual dimorphism is the systematic difference in form between males and females of the same species. This study is designed to compute a new formula for sex determination using discriminant function analysis in the deciduous crown dimensions of a paediatric population of South Indian origin and to check its accuracy. The sample consisted of 93 females and 90 males of South Indian origin aged between 5 and 13 years. Alginate impressions of the upper dental arch were made and casts were poured immediately. A digital vernier calliper was used to obtain measurements. Teeth considered for measurement were deciduous maxillary canines and molars. Our study is a maiden attempt in considering diagonal measurements along with mesiodistal (MD) and buccolingual (BL) dimensions as predictor variables for sex determination. Statistical analysis was performed using the Statistical Package for the Social Science version 17.0 software. By using the Student t-test, the different predictor variables of teeth selected between male and females were found to be significant (p < 0.05). Highly significant sexual dimorphism was found in the mean MD dimension of maxillary right canine and right and left first molar, BL dimension of right first molar, distobuccal-mesiolingual of right and left first molar and right second molar and mesiobuccal-distolingual of right second molar. The percentage of sexual dimorphism in MD dimensions revealed that the right upper first molar was the most dimorphic tooth and the upper first molar of the left side was the least dimorphic of the six teeth studied. The present study found the level of sexual dimorphism in the deciduous crown dimensions of a selected group of South Indian population, which is sufficiently large to determine sex with an accuracy of 87.2-88% by discriminant function analysis. Hence the formula derived from the present study could be of some value in sex determination of paediatric populations of South Indian origin.
人类学研究依靠骨骼和牙齿遗骸来鉴定物种。两性异形是同一物种的雄性和雌性在形态上的系统性差异。本研究旨在利用判别函数分析，计算出一种基于南印度裔儿童乳牙冠尺寸的性别判定新公式，并检验其准确性。样本包括93名年龄在5至13岁之间的南印度裔女性和90名南印度裔男性。制作了上牙弓的藻酸盐印模，并立即灌注石膏模型。使用数字游标卡尺进行测量。测量的牙齿为上颌乳尖牙和磨牙。我们的研究首次尝试将对角线测量以及近远中（MD）和颊舌（BL）尺寸作为性别判定的预测变量。使用社会科学统计软件包第17.0版软件进行统计分析。通过学生t检验发现，男性和女性之间所选牙齿的不同预测变量具有显著性（p < 0.05）。在上颌右尖牙、左右第一磨牙的平均MD尺寸、右第一磨牙的BL尺寸、左右第一磨牙和右第二磨牙的远颊-近舌尺寸以及右第二磨牙的近颊-远舌尺寸中发现了高度显著的两性异形。MD尺寸的两性异形百分比显示，右上第一磨牙是六颗研究牙齿中两性异形最明显的牙齿，而左侧上第一磨牙是两性异形最不明显的牙齿。本研究发现了南印度特定人群乳牙冠尺寸中的两性异形水平，通过判别函数分析，该水平足以以87.2% - 88%的准确率判定性别。因此，本研究得出的公式在南印度裔儿童人群的性别判定中可能具有一定价值。
