Kotrashetti Vijayalakshmi S, Hollikatti Kiran, Mallapur M D, Hallikeremath Seema R, Kale Alka D
Department of Oral Pathology and Microbiology, KLE VK Institute of Dental Sciences and Hospital, Nehru Nagar, Belgaum, Karnataka, India.
J Forensic Leg Med. 2011 Nov;18(8):360-5. doi: 10.1016/j.jflm.2011.07.007. Epub 2011 Aug 19.
Palatal rugae patterns are relatively unique to an individual and are well protected by the lips, buccal pad of fat and teeth. They are considered to be stable throughout life following completion of growth, although there is considerable debate on the matter, they can be used successfully in post mortem identification provided an antemortem record exists. Thus the aim of this study was to examine palatal rugae shape among two Indian populations and determine the accuracy in defining the Indian population using logistic regression analysis. The study comprises two groups from geographically different regions of India with basic origin from Maharashtra and Karnataka state. The sample includes 100 plaster cast equally distributed between two populations and genders with age ranging between 18 and 40 years. Impression of maxillary arch was obtained using alginate impression material and plaster cast was made. The rugae was delineated on the cast using a sharp graphite pencil under adequate light and magnification and recorded according to classification given by Kapali et al. and Thomas and Kotze (1983). Chi-Square analysis showed significant difference in wavy, circular and divergent pattern between the two populations. The straight and wavy forms were significant in logistic regression analysis. A predictive value of 71% was obtained in determining the original cases correctly when straight, wavy, curved and circular patterns were assessed. 70% of predictive value was achieved when all rugae patterns were assessed. Mean number of rugae was greater in females compared to males with straight pattern showing statistically significant difference between males and females. Significant difference was recorded among straight, wavy, circular and divergent pattern between two populations. Consequently this study demonstrates moderate accuracy of palatal rugae pattern using logistic regression analysis in identification of Indians.
腭皱襞形态相对因人而异，且受到嘴唇、颊脂垫和牙齿的良好保护。它们在生长完成后被认为在一生中保持稳定，尽管对此存在相当多的争论，但只要有生前记录，就可以成功用于死后身份鉴定。因此，本研究的目的是检查两个印度人群的腭皱襞形状，并使用逻辑回归分析确定定义印度人群的准确性。该研究包括来自印度地理上不同地区的两组人群，基本来自马哈拉施特拉邦和卡纳塔克邦。样本包括100个石膏模型，在两个人群和性别之间平均分配，年龄在18至40岁之间。使用藻酸盐印模材料获取上颌牙弓印模并制作石膏模型。在充足的光线和放大条件下，用尖锐的石墨铅笔在模型上描绘出皱襞，并根据卡帕利等人以及托马斯和科泽（1983年）给出的分类进行记录。卡方分析显示两个人群在波浪形、圆形和发散形模式上存在显著差异。在逻辑回归分析中，直线形和波浪形形式具有显著性。在评估直线形、波浪形、弯曲形和圆形模式时，正确确定原始病例的预测值为71%。在评估所有皱襞模式时，预测值达到70%。女性的皱襞平均数量多于男性，直线形模式在男性和女性之间显示出统计学上的显著差异。两个人群在直线形、波浪形、圆形和发散形模式之间记录到显著差异。因此，本研究表明，使用逻辑回归分析，腭皱襞形态在识别印度人方面具有中等准确性。
