Developmental defects of the dental crown in chimpanzees from the Taï National Park, Côte D'ivoire: Coronal waisting
Article first published online: 14 AUG 2012
Copyright © 2012 Wiley Periodicals, Inc.
American Journal of Physical Anthropology
Volume 149, Issue 2, pages 272–282, October 2012
How to Cite
Skinner, M. F., Skinner, M. M. and Boesch, C. (2012), Developmental defects of the dental crown in chimpanzees from the Taï National Park, Côte D'ivoire: Coronal waisting. Am. J. Phys. Anthropol., 149: 272–282. doi: 10.1002/ajpa.22123
- Issue published online: 14 SEP 2012
- Article first published online: 14 AUG 2012
- Manuscript Accepted: 27 JUN 2012
- Manuscript Received: 22 DEC 2011
- Jean-Jacques Hublin, the Departments of Human Evolution and Primatology at Max Planck Institute for Evolutionary Anthropology, the Max Planck Society
- Pan troglodytes verus;
- weaning process;
We describe a developmental defect that manifests as a mild constricted “waist” in anterior teeth from seven of nine chimpanzee individuals from Taï National Park, Côte D'Ivoire. The sample consists of 21 canine teeth and one incisor, imaged in profile with a digital microscope. Twelve teeth are affected. The waist develops during tooth formation as an external, encircling depression in the contour of the outer enamel surface, more easily seen labially. It is not a thinning of enamel per se, but rather a slight decrement in dentinal crown volume, shown in microCT scans as a change in contour of the enamel-dentin junction, spanning between 3 and 6 years of age, varying among individuals, with maximum expression at about age 4.3 years. The timing and duration of coronal waisting are consistent with descriptions of the weaning process at Taï and other chimpanzee study sites. We propose that coronal waisting records variation in the individual infant chimpanzee's physiological experiences during the process of attaining independence, increased foraging efficiency, and lactational weaning. Am J Phys Anthropol 149:272–282, 2012. © 2012 Wiley Periodicals, Inc.