Enamel thickness variation of deciduous first and second upper
molars in modern humans and Neanderthals

J 2014

Enamel thickness variation of deciduous first and second upper molars in modern humans and Neanderthals

FORNAI, Cinzia, Stefano BENAZZI, Jiří SVOBODA, Ildikó PAP, Katerina HARVATI et. al.

Basic information

Original name

Enamel thickness variation of deciduous first and second upper molars in modern humans and Neanderthals

Name in Czech

Variace v tloušťce zubní skloviny první a druhé mléčné stoličky u moderního člověka a neandertálců

Authors

FORNAI, Cinzia (40 Austria, guarantor), Stefano BENAZZI (380 Italy), Jiří SVOBODA (203 Czech Republic, belonging to the institution), Ildikó PAP (348 Hungary), Katerina HARVATI (276 Germany) and Gerhard WEBER (40 Austria)

Edition

Journal of Human Evolution, Elsevier, 2014, 0047-2484

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

Archaeology, anthropology, ethnology

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 3.733

RIV identification code

RIV/00216224:14310/14:00079107

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1016/j.jhevol.2014.05.013

UT WoS

000345185000007

Keywords in English

Dental tissue proportions Tooth wear; Deciduous dentition; Homo neanderthalensis; Homo sapiens; Pleistocene

Abstract

V originále

Enamel thickness and dental tissue proportions have been recognized as effective taxonomic discriminators between Neanderthal and modern humans teeth. However, most of the research on this topic focused on permanent teeth, and little information is available for the deciduous dentition. Moreover, although worn teeth are more frequently found than unworn teeth, published data for worn teeth are scarce and methods for the assessment of their enamel thickness need to be developed. Here, we addressed this issue by studying the 2D average enamel thickness (AET) and 2D relative enamel thickness (RET) of Neanderthal and modern humans unworn to moderately worn upper first deciduous molars (dm1s) and upper second deciduous molars (dm2s). In particular, we used 3D mCT data to investigate the mesial section for dm1s and both mesial and buccal sections for dm2s. Our results confirmed previous findings of an Neanderthal derived condition of thin enamel, and thinner enamel in dm1s than dm2s in both Neanderthal and modern humans. We demonstrated that the Neanderthal 2D RET indices are significantly lower than those of modern humans at similar wear stages in both dm1s and dm2s (p < 0.05). The discriminant analysis showed that using 2D RET from dm1 and dm2 sections at different wear stages up to 93% of the individuals are correctly classified. Moreover, we showed that the dm2 buccal sections, although non-conventionally used, might have an advantage on mesial sections since they distinguish as well as mesial sections but tend to be less worn. Therefore, the 2D analysis of enamel thickness is suggested as a means for taxonomic discrimination between modern humans and Neanderthal unworn to moderately worn upper deciduous molars.

Citovat

FORNAI, Cinzia, Stefano BENAZZI, Jiří SVOBODA, Ildikó PAP, Katerina HARVATI and Gerhard WEBER. Enamel thickness variation of deciduous first and second upper molars in modern humans and Neanderthals. Journal of Human Evolution. Elsevier, 2014, vol. 76, November, p. 83-91. ISSN 0047-2484. Available from: https://dx.doi.org/10.1016/j.jhevol.2014.05.013.

@article{1226551,
   author = {Fornai, Cinzia and Benazzi, Stefano and Svoboda, Jiří and Pap, Ildikó and Harvati, Katerina and Weber, Gerhard},
   article_number = {November},
   doi = {http://dx.doi.org/10.1016/j.jhevol.2014.05.013},
   keywords = {Dental tissue proportions Tooth wear; Deciduous dentition; Homo neanderthalensis; Homo sapiens; Pleistocene},
   language = {eng},
   issn = {0047-2484},
   journal = {Journal of Human Evolution},
   title = {Enamel thickness variation of deciduous first and second upper molars in modern humans and Neanderthals},
   volume = {76},
   year = {2014}
}

TY  - JOUR
ID  - 1226551
AU  - Fornai, Cinzia - Benazzi, Stefano - Svoboda, Jiří - Pap, Ildikó - Harvati, Katerina - Weber, Gerhard
PY  - 2014
TI  - Enamel thickness variation of deciduous first and second upper molars in modern humans and Neanderthals
JF  - Journal of Human Evolution
VL  - 76
IS  - November
SP  - 83-91
EP  - 83-91
PB  - Elsevier
SN  - 00472484
KW  - Dental tissue proportions Tooth wear
KW  - Deciduous dentition
KW  - Homo neanderthalensis
KW  - Homo sapiens
KW  - Pleistocene
N2  - Enamel thickness and dental tissue proportions have been recognized as effective taxonomic discriminators between Neanderthal and modern humans teeth. However, most of the research on this topic focused on permanent teeth, and little information is available for the deciduous dentition. Moreover, although worn teeth are more frequently found than unworn teeth, published data for worn teeth are scarce and methods for the assessment of their enamel thickness need to be developed. Here, we addressed this issue by studying the 2D average enamel thickness (AET) and 2D relative enamel thickness (RET) of Neanderthal and modern humans unworn to moderately worn upper first deciduous molars (dm1s) and upper second deciduous molars (dm2s). In particular, we used 3D mCT data to investigate the mesial section for dm1s and both mesial and buccal sections for dm2s. Our results confirmed previous findings of an Neanderthal derived condition of thin enamel, and thinner enamel in dm1s than dm2s in both Neanderthal and modern humans. We demonstrated that the Neanderthal 2D RET indices are significantly lower than those of modern humans at similar wear stages in both dm1s and dm2s (p < 0.05). The discriminant analysis showed that using 2D RET from dm1 and dm2 sections at different wear stages up to 93% of the individuals are correctly classified. Moreover, we showed that the dm2 buccal sections, although non-conventionally used, might have an advantage on mesial sections since they distinguish as well as mesial sections but tend to be less worn. Therefore, the 2D analysis of enamel thickness is suggested as a means for taxonomic discrimination between modern humans and Neanderthal unworn to moderately worn upper deciduous molars.
ER  -

FORNAI, Cinzia, Stefano BENAZZI, Jiří SVOBODA, Ildikó PAP, Katerina HARVATI and Gerhard WEBER. Enamel thickness variation of deciduous first and second upper molars in modern humans and Neanderthals. \textit{Journal of Human Evolution}. Elsevier, 2014, vol.~76, November, p.~83-91. ISSN~0047-2484. Available from: https://dx.doi.org/10.1016/j.jhevol.2014.05.013.

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