Affordable Access

The mechanical properties of the dentine and cement of the tusk of the narwhal Monodon monoceros compared with those of other mineralized tissues.

Authors
  • Brear, K
  • Currey, J D
  • Pond, C M
  • Ramsay, M A
Type
Published Article
Journal
Archives of Oral Biology
Publisher
Elsevier
Publication Date
Jan 01, 1990
Volume
35
Issue
8
Pages
615–621
Identifiers
PMID: 2256815
Source
Medline
License
Unknown

Abstract

Values for Young's modulus of elasticity, ultimate and yield stresses, ultimate and yield strains, work under the stress-strain curve and work of fracture were obtained from tensile and bending tests on specimens of narwhal tusk dentine and cement, femoral bone from young and mature cattle, and reindeer antler. Compared with the cattle bone the narwhal tissues had low Young's moduli, low yield stresses, rather low ultimate stresses and high ultimate strains. In all these properties they were similar to reindeer antler. The calcium content and hardness of the narwhal tissues were compared with those of human and cattle dental tissues. The narwhal dentine was considerably softer and less mineralized than human and cattle dentine. Human cementum was softer and less mineralized than cattle cementum, and was like narwhal cementum. In general, the mechanical properties of the narwhal tusk tissues were as would be expected from their mineral content, except that the stiffness of the cementum was low. It is likely that narwhal dentine is not very similar to human and cattle dentine in its mechanical properties.

Report this publication

Statistics

Seen <100 times