Department of Anthropology, University of Nevada, Reno
April 22, 2017 , Studio 6
Various sex estimation methods exist; however, few are population-specific, which can make estimations of sex across populations problematic. Additionally, sex estimation becomes increasingly difficult with fragmentary remains. This study attempts to address both problems in skeletal analyses by presenting a study in which various dental measurements can be used in a population-specific method to estimate sex.
Data were collected on Japanese individuals (males=75 and females=22) who lived in the late nineteenth to early twentieth century, comprising part of a skeletal collection housed at Chiba University in Chiba, Japan. Maximum crown and cervical dimensions (mesiodistal and buccolingual) were collected on the left dental arcade; the right antimere was substituted in the case of a missing tooth. Univariate t-tests indicate sexual dimorphism in both crown dimensions of UI2; crown buccolingual dimensions of UC, UM2, LI1, and LC; both cervical dimensions of UI2, UP3, LC; cervical buccolingual dimensions of UP4, UM2, LI1, LP3, LP4; and cervical mesiodistal dimensions of UC and LM2. A step-wise discriminant function utilizing the cervical buccolingual dimensions of the maxillary canine and mandibular lateral incisor and second molar worked moderately well at classifying individuals by sex (75.9% of original group correctly classified, 59.3% of cross-validated group). Finally, various equations were created to aid in the estimation of sex in the case of an unknown individual. This study highlights the variability in sexual dimorphism between populations and the importance of producing population-specific equations.