Analysis of growth layers in the teeth of Tursiops truncatus using light microscopy, microradiography, and SEM

Hohn, Aleta A. (1980) Analysis of growth layers in the teeth of Tursiops truncatus using light microscopy, microradiography, and SEM. Report of the International Whaling Commission, Specia, pp. 155-160.

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Abstract

Preliminary results show microradiography and scanning electron microscopy (SEM) to be more accurate methods of accessing growth layer groups (GLGs) in the teeth of Tursiops truncatus than transmitted light microscopy. Microradiography shows the rhythmic deposition of mineral as alternating radiopaque and radiolucent layers. It improves the resolution of GLGs near the pulp cavity in older individuals, better than either SEM or light microscopy. SEM of etched sections show GLGs as ridges and grooves which are easily counted from the micrograph. SEM also shows GLGs to be composed of fine incremental layers of uniform size and number which may allow for more precise age determination. Accessory layers are usually hypomineralized layers within the hypermineralized layer of the GLG and are more readily distinguishable as such in SEM of etched sections and microradiographs than in thin sections viewed under transmitted light. The neonatal line is hypomineralized, appearing translucent under transmitted light, radiolucent in a microradiograph, and as a ridge in SEM. (PDF contains 6 pages.)

Item Type: Article
Title: Analysis of growth layers in the teeth of Tursiops truncatus using light microscopy, microradiography, and SEM
Personal Creator/Author:
CreatorsEmail
Hohn, Aleta A.
Refereed: Yes
Journal or Publication Title: Report of the International Whaling Commission
Volume: Specia
Page Range: pp. 155-160
Date: 1980
Issuing Agency: United States National Marine Fisheries Service
Subjects: Ecology
Conservation
Fisheries
Item ID: 2456
Depositing User: Patti M. Marraro
Date Deposited: 20 Jul 2009 18:10
Last Modified: 29 Sep 2011 19:05
URI: http://aquaticcommons.org/id/eprint/2456

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