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Title: Brief communication: contributions of enamel‐dentine junction shape and enamel deposition to primate molar crown complexity
Authors: Skinner, Matthew M.
Evans, Alistair
Smith, Tanya M.
Jernvall, Jukka
Tafforeau, Paul
Kupczik, Kornelius
Olejniczak, Anthony J.
Rosas, Antonio
Radovčić, Jakov
Thackeray, John Francis ‎
Toussaint, Michel
Hublin, Jean-Jacques
Keywords: Tooth morphology;Enamel-dentine junction;Crown complexity;Micro‐computed tomography;Dental topographic analysis
Issue Date: May-2010
Publisher: Wiley
Citation: American Journal of Physical Anthropology, 2010, 142 (1), 157-163
Abstract: Molar crown morphology varies among primates from relatively simple in some taxa to more complex in others, with such variability having both functional and taxonomic significance. In addition to the primary cusps, crown surface complexity derives from the presence of crests, cuspules, and crenulations. Developmentally, this complexity results from the deposition of an enamel cap over a basement membrane (the morphology of which is preserved as the enamel‐dentine junction, or EDJ, in fully formed teeth). However, the relative contribution of the enamel cap and the EDJ to molar crown complexity is poorly characterized. In this study we examine the complexity of the EDJ and enamel surface of a broad sample of primate (including fossil hominin) lower molars through the application of micro‐computed tomography and dental topographic analysis. Surface complexity of the EDJ and outer enamel surface (OES) is quantified by first mapping, and then summing, the total number of discrete surface orientation patches. We investigate the relative contribution of the EDJ and enamel cap to crown complexity by assessing the correlation in patch counts between the EDJ and OES within taxa and within individual teeth. We identify three patterns of EDJ/OES complexity which demonstrate that both crown patterning early in development and the subsequent deposition of the enamel cap contribute to overall crown complexity in primates.
ISSN: 0002-9483
DOI: 10.1002/ajpa.21248
Type: Article
Appears in Collections:Paleobiología

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