Sexual dimorphism involved in the mesiodistal and buccolingual dimensions of permanent teeth


  • Ticiana Medeiros Sabóia
  • Patricia Nivoloni Tannure Discipline of Pediatric Dentistry, School of Dentistry, Veiga de Almeida University, RJ, Brazil
  • Ronir Raggio Luiz Institute of Public Health Studies, Federal University of Rio de Janeiro, RJ, Brazil.
  • Marcelo de Castro Costa Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, RJ, Brazil
  • Jose Mauro Granjeiro Unit of Clinical Research, Fluminense Federal University, Niterói, RJ, Brazil;
  • Erika Calvano Küchler Unit of Clinical Research, Fluminense Federal University, Niterói, RJ, Brazil
  • Leonardo Santos Antunes Department of Specific Formation, School of Dentistry, Fluminense Federal University, Nova Friburgo, RJ, Brazil



Sex Determination, tooth crown, tooth class


Studies indicate that tooth crown diameters are clinical markers for sex differentiation. Therefore, the aim of this study was to assess the degree of sexual dimorphism in different teeth. Maximum mesiodistal (MD) and buccolingual (BL) dimensions of 2400 permanent teeth from 100 pretreatment orthodontic dental study casts and clinical records (50 males and 50 females) from the Department of Pediatric Dentistry and Orthodontics, Federal University of Rio de Janeiro, Brazil, were examined. Comparison of the MD and BL dimensions between males and females was performed using the Student’s t test with alpha 0.05, effect size, and discriminant function analysis. Comparisons in MD and BL widths between sexes demonstrated that the combined mean in the female group presented reduction when compared with the male group, except for the BL dimension of tooth 26. In regard to the MD dimensions, statistically significant differences were observed in various dental groups. The greatest sexual dimorphism was observed in the left mandibular canine (p<0.001) with effect size over 0.8 (0.94), which characterizes large effect. In BL dimension, numerous teeth demonstrated statistical differences between the sexes. Our findings reinforced the magnitude of sexual dimorphism in tooth size, and, in addition, highlighted the differences in specific dental groups.


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Development of Craniofacial Structures