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A geometric morphometric approach to the study of variation of shovel-shaped incisors

Carayon, Delphine and Adhikari, Kaustubh and Monsarrat, Paul and Dumoncel, Jean and Braga, José and Duployer, Benjamin and Delgado, Miguel and Fuentes-Guajardo, Macarena and de Beer, Frikkie and Hoffman, Jakobus W. and Oettlé, Anna C. and Donat, Richard and Pan, Lei and Ruiz-Linares, Andres and Tenailleau, Christophe and Vaysse, Frédéric and Esclassan, Rémi and Zanolli, Clément A geometric morphometric approach to the study of variation of shovel-shaped incisors. (2018) American Journal of Physical Anthropology, 168 (1). 229-241. ISSN 0002-9483

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Official URL: https://doi.org/10.1002/ajpa.23709

Abstract

Objectives : The scoring and analysis of dental nonmetric traits are predominantly accomplished by using the Arizona State University Dental Anthropology System (ASUDAS), a standard protocol based on strict definitions and three‐dimensional dental plaques. However, visual scoring, even when controlled by strict definitions of features, visual reference, and the experience of the observer, includes an unavoidable part of subjectivity. In this methodological contribution, we propose a new quantitative geometric morphometric approach to quickly and efficiently assess the variation of shoveling in modern human maxillary central incisors (UI1). Materials and methods : We analyzed 87 modern human UI1s by means of virtual imaging and the ASU‐UI1 dental plaque grades using geometric morphometrics by placing semilandmarks on the labial crown aspect. The modern human sample was composed of individuals from Europe, Africa, and Asia and included representatives of all seven grades defined by the ASUDAS method. Results : Our results highlighted some limitations in the use of the current UI1 ASUDAS plaque, indicating that it did not necessarily represent an objective gradient of expression of a nonmetric tooth feature. Rating of shoveling tended to be more prone to intra‐ and interobserver bias for the highest grades. In addition, our analyses suggest that the observers were strongly influenced by the depth of the lingual crown aspect when assessing the shoveling. Discussion : In this context, our results provide a reliable and reproducible framework reinforced by statistical results supporting the fact that open scale numerical measurements can complement the ASUDAS method.

Item Type:Article
HAL Id:hal-02296695
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Centre Hospitalier Régional Universitaire de Montpellier - CHRU Montpellier (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Institute of Vertebrate Paleontology and Paleoanthropology - IVPP (CHINA)
Other partners > Nanjing Institute of Geology and Palaeontology (CHINA)
Other partners > University College of London - UCL (UNITED KINGDOM)
Other partners > Universidad Nacional de la Plata - UNLP (ARGENTINA)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Universidad de Tarapacá (CHILE)
Other partners > Consejo Nacional de Investigaciones Científicas y Técnicas - CONICET (ARGENTINA)
Other partners > Centre Hospitalier Universitaire de Toulouse - CHU Toulouse (FRANCE)
French research institutions > Institut National de Recherches Archéologiques Préventives - INRAP (FRANCE)
Other partners > South African Nuclear Energy Corporation - NECSA (SOUTH AFRICA)
Other partners > Shanghai University (CHINA)
Other partners > University of Pretoria (SOUTH AFRICA)
Other partners > University of the Witwatersrand - WITS (SOUTH AFRICA)
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Deposited On:13 Nov 2019 09:23

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