Babu Sharlene Sara, Nair Sunil Sukumaran, Gopakumar Devi, Kurian Nisha, Parameswar Arjun, Baby Tibin Kaithappillil
Reader, Department of Oral & Maxillofacial Pathology, Pushpagiri College of Dental Sciences , Kerala, India .
Professor and Head, Department of Oral & Maxillofacial Pathology, Pushpagiri College of Dental Sciences , Kerala, India .
J Clin Diagn Res. 2016 May;10(5):ZC24-8. doi: 10.7860/JCDR/2016/18677.7741. Epub 2016 May 1.
Sex determination in forensic anthropology is an essential step for medico-legal purposes and crucial for identification as the number of possible matches is reduced to 50%. Teeth are an excellent material for anthropological, genetic, odontological and forensic investigations as they are known to resist a variety of ante-mortem and post-mortem insults. Sexual dimorphism in tooth size and the accuracy of odontometric sex prediction is found to vary in different population and therefore it is necessary to determine specific population values in order to make identification possible. Hence, the present study was undertaken to evaluate the existence of sexual dimorphism in South Kerala population.
To evaluate and estimate the degree of odontometric sexual dimorphism in all permanent teeth except third molars and the variations in odontometric dimensions between the left and right side teeth of the maxillary and mandibular arches in male and female groups.
The MesioDistal (MD) and BuccoLingual (BL) measurements of 28 teeth were estimated from the preorthodontic casts of 132 subjects; male group (66 males) and female group (66 females) of age range 15-25 years using digital Verniers' Caliper. The data obtained were analysed using SPSS version 17 and the Students' t-test for two independent samples.
The MesioDistal (MD) and BuccoLingual (BL) parameters of all permanent teeth in the study group showed sexual dimorphism. Over 39% of the tooth variables showed reverse dimorphism. The comparison of mean values of MD and BL diameters of the maxillary and mandibular, right and left side teeth in male and female groups showed statistical significance in males whereas females show non-significant values in both MD and BL diameters.
The study showed a varied percentage of sexual dimorphism and variation in the mean values of MD and BL dimensions in males, but not in females between right and left side teeth of the maxillary and mandibular arches of the study population.
法医人类学中的性别鉴定是法医学目的的重要步骤，对于身份识别至关重要，因为可能的匹配数量会减少到50%。牙齿是人类学、遗传学、牙科学和法医调查的优质材料，因为它们能抵抗各种生前和死后的损伤。牙齿大小的性别二态性以及牙测量性别预测的准确性在不同人群中有所不同，因此有必要确定特定人群的值以便进行身份识别。因此，本研究旨在评估喀拉拉邦南部人群中性别二态性的存在情况。
评估和估计除第三磨牙外所有恒牙的牙测量性别二态性程度，以及男性和女性组上颌和下颌牙弓左右侧牙齿在牙测量尺寸上的差异。
使用数字游标卡尺，从132名年龄在15至25岁的受试者（男性组66名男性和女性组66名女性）的正畸治疗前模型中估计28颗牙齿的近远中（MD）和颊舌（BL）测量值。使用SPSS 17版对获得的数据进行分析，并对两个独立样本进行学生t检验。
研究组所有恒牙的近远中（MD）和颊舌（BL）参数均显示出性别二态性。超过39%的牙齿变量显示出反向二态性。男性和女性组上颌和下颌、右侧和左侧牙齿的MD和BL直径平均值的比较显示，男性具有统计学意义，而女性在MD和BL直径上均无显著差异。
研究表明，在研究人群的上颌和下颌牙弓的左右侧牙齿中，男性的性别二态性百分比和MD及BL尺寸平均值存在差异，而女性则没有。
