Brief communication: Enamel thickness trends in the dental arcade of humans and chimpanzees

Wiley - Tập 136 Số 2 - Trang 237-241 - 2008
Tanya M. Smith1, Anthony J. Olejniczak1, Stefan Reh1, Donald J. Reid2, Jean‐Jacques Hublin1
1Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Max Planck Society
2Department of Oral Biology, School of Dental Sciences, Newcastle University, Newcastle upon Tyne NE2 4BW, UK

Tóm tắt

AbstractIn addition to evidence for bipedality in some fossil taxa, molar enamel thickness is among the few characters distinguishing (thick‐enameled) hominins from the (thin‐enameled) African apes. Despite the importance of enamel thickness in taxonomic discussions and a long history of scholarship, measurements of enamel thickness are performed almost exclusively on molars, with relatively few studies examining premolars and anterior teeth. This focus on molars has limited the scope of enamel thickness studies (i.e., there exist many fossil hominin incisors, canines, and premolars). Increasing the available sample of teeth from which to compare enamel thickness measurements from the fossil record could substantially increase our understanding of this aspect of dental biology, and perhaps facilitate greater taxonomic resolution of early hominin fossils. In this study, we report absolute and relative (size‐scaled) enamel thickness measurements for the complete dentition of modern humans and chimpanzees. In accord with previous studies of molars, chimpanzees show lower relative enamel thickness at each tooth position, with little overlap between the two taxa. A significant trend of increasing enamel thickness from anterior to posterior teeth is apparent in both humans and chimpanzees, indicating that inter‐taxon comparisons should be limited to the same tooth position in order to compare homologous structures. As nondestructive imaging techniques become commonplace (facilitating the examination of increasing numbers of fossil specimens), studies may maximize available samples by expanding beyond molars. Am J Phys Anthropol, 2008. © 2008 Wiley‐Liss, Inc.

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Tài liệu tham khảo

10.1016/0047-2484(87)90062-5

10.1098/rstb.1991.0109

10.1126/science.284.5414.629

10.1038/378273a0

10.1038/nature03392

10.1038/nature00879

10.1002/oa.1390030404

10.1046/j.0021-8782.2001.00001.x

10.1002/ajpa.10277

Grine FE, 1988, Evolutionary history of the “Robust” Australopithecines, 3

10.1038/35084063

10.1002/ajpa.1330550202

10.1537/ase.03106

10.1038/35068500

10.1002/ajpa.1330920208

10.1002/ajpa.1330940304

MartinLB.1983.The relationships of the later Miocene hominoidea. PhD thesis. London University College London.

10.1038/314260a0

10.1002/ajpa.1330010103

10.1002/ar.a.20307

Olejniczak AJ, Dental tissue proportions and enamel thickness in Neandertal and modern human molars, J Hum Evol

10.1002/ajpa.20711

10.1016/j.jhevol.2005.09.003

Reid DJ, Variation in modern human premolar enamel formation times: implications for Neanderthals, J Hum Evol

10.1006/jhev.1998.0248

10.1093/oxfordjournals.molbev.a025761

10.1002/ajpa.20211

Senut B, 2001, First hominid from the Miocene (Lukeino Formation. Kenya), Comptes Rendus Acad Sci Ser II‐A, 332, 137

10.1016/j.jhevol.2005.02.004

10.1016/j.archoralbio.2006.04.012

Smith TM, 2006, Molar crown thickness, volume, and development in South African middle Stone Age humans, S Afr J Sci, 102, 513

10.1016/j.jhevol.2006.09.004

TafforeauP.2004.Phylogenetic and functional aspects of tooth enamel microstructure and three‐dimensional structure of modern and fossil primate molars. PhD thesis Montpellier Montpellier University II.

10.1038/371306a0

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Wiley

Tập 136 Số 2

237-241

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