Cecilia García-Campos1,2, María Martinón-Torres1,2, Laura Martín-Francés1,3, Marina Martínez de Pinillos1,2, Mario Modesto-Mata1,2,4, Bernardo Perea-Pérez5, Clément Zanolli6, Elena Labajo González5, José Antonio Sánchez Sánchez5, Elena Ruiz Mediavilla5, Claudio Tuniz7, José María Bermúdez de Castro1,2. 1. Departamento de Paleobiología de Homínidos, Centro Nacional de Investigación sobre la Evolución Humana, Paseo de la Sierra de Atapuerca 3, Burgos, 09002, Spain. 2. Anthropology Department, University College London, London, WC1H 0BW, United Kingdom. 3. De la Préhistoire à l'Actuel : Culture, Environnement et Anthropologie, University of Bordeaux, CNRS, MCC, PACEA, UMR 5199 F_33615, Pessac Cedex, France. 4. Equipo Primeros Pobladores de Extremadura, Casa de la Cultura Rodríguez Moñino, Cáceres, Spain. 5. Laboratorio de Antropología Forense, Escuela de Medicina Legal y Forense, Universidad Complutense de Madrid, Spain. 6. Laboratoire d'Anthropobiologie Moléculaire et d'Imagerie de Synthèse, UMR 5288 CNRS, University Toulouse III-Paul Sabatier, France. 7. Multidisciplinary Laboratory, International Centre for Theoretical Physics (ICTP) of Trieste, Trieste, Italy.
Abstract
OBJECTIVES: Accurate sex estimation is an essential step for the reconstruction of the biological profile of human remains. Earlier studies have shown that elements of the human permanent dentition are sexually dimorphic. The aims of this study are to determine the degree of sexual dimorphism in the dental tissue volumes and surface areas of mandibular canines and to explore its potential for reliable sex determination. METHOD: The teeth included in this study (n = 69) were selected from anthropological collections from Spain, South Africa and Sudan. In all cases, the sex of the individuals was known. The teeth were scanned and three-dimensional (3D) measurements (volumes and surfaces areas) were obtained. Finally, a dsicriminant function analysis was applied. RESULTS: Our results showed that sexual dimorphism in canine size is due to males having greater amounts of dentine, whereas enamel volume does not contribute significantly to overall tooth size dimorphism. Classification accuracy of the multivariable equations tested on slightly worn teeth ranged from 78 to 90.2% for the crossvalidation, and from 71.43 to 84.62% for the hold-out sample validation. When all functions were applied together, the sex was correctly assigned 92.30% of the time. CONCLUSIONS: Our results suggest that the 3D variables from mandibular canine dental tissues are useful for sex determination as they present a high degree of dimorphism. The results obtained show the importance of 3D dental tissue measurements as a methodology in sex determination, which application should be considered as a supplemental method to others.
OBJECTIVES: Accurate sex estimation is an essential step for the reconstruction of the biological profile of human remains. Earlier studies have shown that elements of the human permanent dentition are sexually dimorphic. The aims of this study are to determine the degree of sexual dimorphism in the dental tissue volumes and surface areas of mandibular canines and to explore its potential for reliable sex determination. METHOD: The teeth included in this study (n = 69) were selected from anthropological collections from Spain, South Africa and Sudan. In all cases, the sex of the individuals was known. The teeth were scanned and three-dimensional (3D) measurements (volumes and surfaces areas) were obtained. Finally, a dsicriminant function analysis was applied. RESULTS: Our results showed that sexual dimorphism in canine size is due to males having greater amounts of dentine, whereas enamel volume does not contribute significantly to overall tooth size dimorphism. Classification accuracy of the multivariable equations tested on slightly worn teeth ranged from 78 to 90.2% for the crossvalidation, and from 71.43 to 84.62% for the hold-out sample validation. When all functions were applied together, the sex was correctly assigned 92.30% of the time. CONCLUSIONS: Our results suggest that the 3D variables from mandibular canine dental tissues are useful for sex determination as they present a high degree of dimorphism. The results obtained show the importance of 3D dental tissue measurements as a methodology in sex determination, which application should be considered as a supplemental method to others.