Enamel extension rate patterns in modern human teeth: Two approaches designed to establish an integrated comparative context for fossil primates

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dc.contributor.author Guatelli-Steinberg, D en
dc.contributor.author Floyd, Bruce en
dc.contributor.author Dean, MC en
dc.contributor.author Reid, DJ en
dc.date.accessioned 2017-07-09T23:46:06Z en
dc.date.issued 2012-09 en
dc.identifier.citation Journal of Human Evolution 63(3):475-486 Sep 2012 en
dc.identifier.issn 1095-8606 en
dc.identifier.uri http://hdl.handle.net/2292/34114 en
dc.description.abstract Enamel extension rates (EERs), the rates at which ameloblasts differentiate, determine how fast tooth crowns grow in height. Studies of fossil primate (including hominin) enamel microstructure usually focus on species differences in enamel formation time, but they have also begun to address species-level variation in enamel extension rates. To improve our ability to compare EERs among primate species, a better understanding how EERs vary within species is necessary. Using a large and diverse modern human histological sample, we find that initial EERs and patterns of EER change along the enamel-dentine junction (EDJ) vary in relation to EDJ length. We also find that enamel formation time varies in relation to EDJ length, but that it does so independently of initial EERs. These results suggest that EDJ length variation within a species sample can affect interspecific comparisons not only of EERs but also of enamel formation times. Additionally, these results lend within-species support to the hypothesis, based on comparisons among hominin species, that EERs and crown formation times can vary independently (. Dean, 2009). In a second approach, we analyzed EER changes specifically in the lateral enamel of two modern human population samples as these changes relate to the distribution of perikymata. As surface manifestations of internal enamel growth increments, perikymata provide a valuable source of information about enamel growth in fossils. We find that EER declines in the lateral enamel are associated with an increase in perikymata density from first to last-formed lateral enamel. Moreover, variation in the extent of EER decline among individuals is associated with variation in the distribution of perikymata along their enamel surfaces. These latter findings suggest that the distribution of perikymata on the enamel surface provides information about rates of EER decline in lateral enamel, at least in modern humans. © 2012 Elsevier Ltd. en
dc.publisher Academic Press en
dc.relation.ispartofseries Journal of Human Evolution en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Enamel extension rate patterns in modern human teeth: Two approaches designed to establish an integrated comparative context for fossil primates en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.jhevol.2012.05.006 en
pubs.issue 3 en
pubs.begin-page 475 en
pubs.volume 63 en
dc.rights.holder Copyright: Elsevier en
dc.identifier.pmid 22748383 en
pubs.end-page 486 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 361110 en
pubs.org-id Arts en
pubs.org-id Social Sciences en
pubs.org-id Anthropology en
pubs.record-created-at-source-date 2012-10-15 en
pubs.dimensions-id 22748383 en

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