Sexual dimorphism in the enamel‐dentine junction (EDJ) of permanent canines of European modern humans

Author:

García‐Campos Cecilia12ORCID,Yacobi Izquierdo Cecilia23ORCID,Modesto‐Mata Mario14ORCID,Martín‐Francés Laura156ORCID,Martínez de Pinillos Marina17ORCID,Martinón‐Torres María18ORCID,Perea Perez Bernárdo9ORCID,Bermúdez de Castro José María17ORCID,García‐Martínez Daniel1310ORCID

Affiliation:

1. Centro Nacional de Investigación sobre la Evolución Humana Burgos Spain

2. Universidad Autónoma de Madrid Ciudad Universitaria de Cantoblanco Madrid Spain

3. Physical Anthropology Unit, Department of Biodiversity, Ecology, and Evolution, Faculty of Biological Sciences Complutense University of Madrid Madrid Spain

4. Universidad Internacional de La Rioja (UNIR) La Rioja Spain

5. Institut Català de Paleoecologia Humana i Evolució Social (IPHES) Tarragona Spain

6. Centro Mixto Universidad Complutense de Madrid ‐ Instituto de Salud Carlos III de Evolución y Comportamiento Humanos Madrid Spain

7. Laboratorio de Evolución Humana (LEH) Universidad de Burgos Burgos Spain

8. Anthropology Department University College London London UK

9. Laboratorio de Antropología Forense, Escuela de Medicina Legal y Forense Universidad Complutense de Madrid Madrid Spain

10. Laboratory of Forensic Anthropology, Centre for Functional Ecology, Department of Life Sciences University of Coimbra Coimbra Portugal

Abstract

AbstractObjectivesDental anthropological investigations into sexual dimorphism have conventionally concentrated on evaluating the dimensions and configuration of the enamel cap of canines. However, the morphology of the crown dentine surface can be closely linked to that of the enamel surface. This link can facilitate examination of crown morphology even when the enamel surface is slightly worn. Here, we determine if the morphology of the enamel‐dentine junction (EDJ) differs within (maxillary vs. mandibular) and between a sample of male (n = 26) and female (n = 21) contemporary human permanent canines from Europe.MethodsThe morphological data of the EDJ were gathered employing a template comprising 96 landmarks and sliding semilandmarks. Subsequently, the data underwent analysis through form space principal component analysis following Procrustes registration, utilizing standard 3D geometric morphometric techniques.ResultsSignificant differences in the morphology of the EDJ were observed between the sexes, particularly concerning the overall shape of the crown, the symmetry of the mesial and distal edges, and the development of the distal accessory ridge.ConclusionsSex differences in the morphology of the EDJ could relate in part to retention of the canine‐premolar honing complex in males. Our results indicate that analyses of the permanent canine EDJ may potentially provide a novel method for estimating the sex of adult and nonadult skeletons.

Funder

Leakey Foundation

Publisher

Wiley

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