Cervical and Crown Outline Analysis of Worn Neanderthal and Modern Human Lower Second Deciduous Molars
Stefano Benazzi
(1, 2)
,
Cinzia Fornai
(1)
,
Laura Buti
,
Michel Toussaint
,
Francesco Mallegni
,
Stefano Ricci
(3, 4)
,
Giorgio Gruppioni
,
Gerhard W. Weber
(1)
,
Silvana Condemi
(5)
,
Annamaria Ronchitelli
(6)
Stefano Benazzi
- Fonction : Auteur
- PersonId : 1056748
- ORCID : 0000-0003-4305-6920
Cinzia Fornai
- Fonction : Auteur
- PersonId : 765096
- ORCID : 0000-0002-0911-0164
Laura Buti
- Fonction : Auteur
Michel Toussaint
- Fonction : Auteur
Francesco Mallegni
- Fonction : Auteur
Giorgio Gruppioni
- Fonction : Auteur
Silvana Condemi
- Fonction : Auteur
- PersonId : 750422
- IdHAL : silvana-condemi
- ORCID : 0000-0002-6516-0879
- IdRef : 030687802
Résumé
Despite the general increase in digital techniques for dental morphometric analyses, only a few methods are available to study worn teeth. Moreover, permanent dentitions are studied much more frequently than deciduous teeth. In this study, we address both issues by providing a taxonomic classification of Nean- derthal and modern human (MH) lower second decidu- ous molars (dm 2 s) through the analysis of crown and cer- vical outlines. Crown and cervical outlines were obtained from a three-dimensional (3D) digital sample of uni- formly oriented dm 2 s. Both outlines were centered on the centroid of their area and represented by 16 pseudo- landmarks obtained by equiangularly spaced radial vec- tors out of the centroid. We removed size information from the oriented and centered outlines with a uniform scaling of the pseudolandmark configurations to unit Centroid Size. Group shape variation was evaluated sep- arately for the dm 2 crown and cervical outlines through a shape-space principal component (PC) analysis. Finally, quadratic discriminant analysis of a subset of PCs was used to classify the specimens. Our results demonstrate that both outlines successfully separate the two groups. Neanderthals showed a buccodistal expan- sion and convex lingual outline shape, whilst MHs have buccodistal reduction and straight lingual outline shape. Therefore, we confirmed that the cervical outline repre- sents an effective parameter for distinguishing between the two taxa when dealing with worn or damaged dm 2 s.
Domaines
Anthropologie biologiqueFormat du dépôt | Notice |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Cervical and Crown Outline Analysis of Worn Neanderthal and Modern Human Lower Second Deciduous Molars
|
Résumé |
en
Despite the general increase in digital techniques for dental morphometric analyses, only a few methods are available to study worn teeth. Moreover, permanent dentitions are studied much more frequently than deciduous teeth. In this study, we address both issues by providing a taxonomic classification of Nean- derthal and modern human (MH) lower second decidu- ous molars (dm 2 s) through the analysis of crown and cer- vical outlines. Crown and cervical outlines were obtained from a three-dimensional (3D) digital sample of uni- formly oriented dm 2 s. Both outlines were centered on the centroid of their area and represented by 16 pseudo- landmarks obtained by equiangularly spaced radial vec- tors out of the centroid. We removed size information from the oriented and centered outlines with a uniform scaling of the pseudolandmark configurations to unit Centroid Size. Group shape variation was evaluated sep- arately for the dm 2 crown and cervical outlines through a shape-space principal component (PC) analysis. Finally, quadratic discriminant analysis of a subset of PCs was used to classify the specimens. Our results demonstrate that both outlines successfully separate the two groups. Neanderthals showed a buccodistal expan- sion and convex lingual outline shape, whilst MHs have buccodistal reduction and straight lingual outline shape. Therefore, we confirmed that the cervical outline repre- sents an effective parameter for distinguishing between the two taxa when dealing with worn or damaged dm 2 s.
|
Auteur(s) |
Stefano Benazzi
1, 2
, Cinzia Fornai
1
, Laura Buti
, Michel Toussaint
, Francesco Mallegni
, Stefano Ricci
3, 4
, Giorgio Gruppioni
, Gerhard W. Weber
1
, Silvana Condemi
5
, Annamaria Ronchitelli
6
1
Department of Anthropology [University of Vienna]
( 173195 )
- Althansstrasse 14 1090 Vienna
- Autriche
2
Department of Human Evolution [Leipzig]
( 86037 )
- Deutscher Platz 6, D-04103 Leipzig, Germany
- Allemagne
3
Dipartimento di Scienze Ambientali
( 68867 )
- Università di Siena, Siena
- Italie
4
Istituto Italiano di Preistoria e Protostoria
( 173191 )
- Via S. Egidio 50122 Firenze
- Italie
5
ADES -
Anthropologie bio-culturelle, Droit, Ethique et Santé
( 186857 )
- Faculté de Médecine Secteur Nord 51, Boulevard Pierre Dramard 13344 MARSEILLE CEDEX 15
- France
6
U.R. Ecologia Preistorica
( 105953 )
- Università degli Studi di Siena, Via delle Cerchia 5, 53100 Siena
- Italie
|
Comité de lecture |
Oui
|
Vulgarisation |
Non
|
Langue du document |
Anglais
|
Nom de la revue |
|
Audience |
Non spécifiée
|
Date de publication |
2012
|
Volume |
149
|
Numéro |
4
|
Page/Identifiant |
537-546
|
Domaine(s) |
|
Mots-clés |
en
deciduous teeth, crown and cervical outlines, geometric morphometrics, wear
|
DOI | 10.1002/ajpa.22155 |
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