Tusks, the extra-oral teeth.

@article{Alireza2020TusksTE,
  title={Tusks, the extra-oral teeth.},
  author={Nasoori Alireza},
  journal={Archives of oral biology},
  year={2020},
  volume={117},
  pages={
          104835
        }
}
  • Nasoori Alireza
  • Published 9 July 2020
  • Medicine, Biology
  • Archives of oral biology

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TLDR
The diversity of tooth attachment, implantation and replacement in extant and extinct amniotes is evaluated in order to derive hypothetical evolutionary trends in these different dental traits over time and synthetic definitions or redefinitions of most commonly used terms are proposed.
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The conclusions reached are that the narwhal tusks are the expression of canine teeth and that vestigial teeth have no apparent functional characteristics and are following a pattern consistent with evolutionary obsolescence.
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TLDR
The tusk of the African elephant is preceded by a deciduous tooth generally known as the tush, which apparently has no function but provides the anlage and orientation for the development of its permanent successor.
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TLDR
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TLDR
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TLDR
It is shown that ivory has a graded structure with varying MCF orientations and that MCF of the mid-dentin are arranged in plywood like layers with fiber orientations oscillating in a narrow angular range around the tusk axis.
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TLDR
It has been shown that teeth develop from dermal, endodermal or mixed epithelia and, therefore, developmental distinctions between teeth and dermal denticles are diminished, and the “inside‐out” hypothesis must be rejected.
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The findings suggest that other factors than diet abrasiveness, such as mineral imbalances and in particular hereditary malocclusion, are more likely causes for dental problems observed in this species.
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