TY - JOUR
T1 - A geometric morphometric approach to the study of variation of shovel-shaped incisors
AU - Carayon, Delphine
AU - Adhikari, Kaustubh
AU - Monsarrat, Paul
AU - Dumoncel, Jean
AU - Braga, José
AU - Duployer, Benjamin
AU - Delgado, Miguel
AU - Fuentes-Guajardo, Macarena
AU - de Beer, Frikkie
AU - Hoffman, Jakobus W.
AU - Oettlé, Anna C.
AU - Donat, Richard
AU - Pan, Lei
AU - Ruiz-Linares, Andres
AU - Tenailleau, Christophe
AU - Vaysse, Frédéric
AU - Esclassan, Rémi
AU - Zanolli, Clément
N1 - Funding Information:
This study is based on the PhD research program of the first author. It is supported by the French CNRS. The work of P. Monsarrat is supported by Université de Toulouse Hospital (CHU de Toulouse), Uni-versité Toulouse III—Paul Sabatier, the Midi-Pyrenées Region, and the research platform of the Toulouse Dental Faculty (PLTRO). J. Braga provided access to the ASUDAS plaque. We thank G. Krüger for granting access to the Pretoria Bone Collection (PBC) used in this study. For scientific discussion, we are also grateful to F. Duret. The authors are grateful to the editors and the three anonymous reviewers for their valuable comments that greatly helped to improve this article.
Funding Information:
information Toulouse Dental Faculty (PLTRO); Midi- Pyren?es Region; Universit? Toulouse III?Paul Sabatier; CHU de Toulouse; Universit? de Toulouse; French CNRS; Arizona State UniversityThis study is based on the PhD research program of the first author. It is supported by the French CNRS. The work of P. Monsarrat is supported by Universit? de Toulouse Hospital (CHU de Toulouse), Universit? Toulouse III?Paul Sabatier, the Midi-Pyren?es Region, and the research platform of the Toulouse Dental Faculty (PLTRO). J. Braga provided access to the ASUDAS plaque. We thank G. Kr?ger for granting access to the Pretoria Bone Collection (PBC) used in this study. For scientific discussion, we are also grateful to F. Duret. The authors are grateful to the editors and the three anonymous reviewers for their valuable comments that greatly helped to improve this article.
Publisher Copyright:
© 2018 Wiley Periodicals, Inc.
PY - 2018/1
Y1 - 2018/1
N2 - 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.
AB - 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.
KW - ASUDAS
KW - Procrustes and non-Procrustes superimpositions
KW - shovel-shape incisors
KW - virtual anthropology
UR - http://www.scopus.com/inward/record.url?scp=85054100945&partnerID=8YFLogxK
U2 - 10.1002/ajpa.23709
DO - 10.1002/ajpa.23709
M3 - Article
C2 - 30267417
AN - SCOPUS:85054100945
SN - 0002-9483
VL - 168
SP - 229
EP - 241
JO - American Journal of Physical Anthropology
JF - American Journal of Physical Anthropology
IS - 1
ER -