Silva Ana Margarida, Pereira Maria Lurdes, Gouveia Sónia, Tavares João Nuno, Azevedo Álvaro, Caldas Inês Morais
Faculdade de Medicina Dentária da Universidade do Porto, Portugal.
Faculdade de Medicina Dentária da Universidade do Porto, Portugal EPIUnit - Instituto de Saúde Pública da Universidade do Porto, Portugal.
Med Sci Law. 2016 Jan;56(1):7-12. doi: 10.1177/0025802415575415. Epub 2015 Mar 22.
Rao et al.'s mandibular canine index (MCI) is a simple odontometric method which uses the mandibular canine as the key to sex estimation. This index is defined as the ratio between the right canine mesiodistal dimension and the mandibular canine arch width. The aim of this study was to contribute to sex estimation using dental techniques by analysing the MCI efficiency, and to propose a new approach for its use. Measurements were taken from 120 plaster casts (70 females) in the 16-30 year age group. Although statistically significant sexual dimorphism was observed in both the mesiodistal dimension and the mandibular canine arch width, the MCI showed a low accuracy in sex classification (54.2% correct identifications). This accuracy was improved to 64.2% using receiver operating characteristics curve analysis. Yet, despite the better accuracy, these results reinforce the idea that the MCI may not be particularly useful in sex prediction, since it may not reflect the same degree of sexual dimorphism as its absolute measures.
饶等人的下颌尖牙指数（MCI）是一种简单的牙测量方法，它以下颌尖牙作为性别估计的关键。该指数定义为右侧尖牙近远中径与下颌尖牙弓宽度之比。本研究的目的是通过分析MCI的有效性，为利用牙科技术进行性别估计做出贡献，并提出一种新的使用方法。对16至30岁年龄组的120个石膏模型（70名女性）进行了测量。尽管在近远中径和下颌尖牙弓宽度上均观察到具有统计学意义的性别二态性，但MCI在性别分类中的准确性较低（正确识别率为54.2%）。使用受试者工作特征曲线分析后，这一准确率提高到了64.2%。然而，尽管准确率有所提高，但这些结果强化了这样一种观点，即MCI在性别预测中可能并非特别有用，因为它可能无法反映与其绝对测量值相同程度的性别二态性。
