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Morphology of the tooth of the American alligator (Alligator mississippiensis): The fine structure and elemental analysis of the cementum

✍ Scribed by Dr. K. Shimada; I. Sato; H. Moriyama

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 882 KB
Volume: 211
Category: Article
ISSN: 0362-2525
DOI: 10.1002/jmor.1052110309

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The fine structure and the concentration of trace elements in the cementum layer in functional teeth of subadult alligators (ca. 120 cm to 160 cm total length) was studied by using scanning electron microscopy (SEM), microradiography, and electron microprobe analysis (EMPA). The cementum layer was hypertrophic and consisted of two layers: the fibrous layer and the calcified layer. The two layers undergo developmental changes as a result of resorption and replacement. During the tooth replacement in the American alligator, trace elements decreased at the base of the dentine layer; the resorption of the alveolar bone occurred simultaneously at the tooth socket. We concluded that the resorption of the cementum in the alligator provided a useful indication of the mechanism of tooth replacement in crocodilian.

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