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Ontogenetic aspects of dental evolution

P M Butler1

  • 1Dept. of Biology, University of London, Egham, Surrey, United Kingdom.

The International Journal of Developmental Biology
|February 1, 1995
PubMed
Summary

This review explores vertebrate dental evolution, suggesting teeth originated externally before internalizing. Mammalian tooth complexity evolved through developmental processes, but more research on fish is needed.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Comparative anatomy

Background:

  • Teeth likely evolved from dermal structures, later integrating with oral bones.
  • Tooth formation is a continuous, repetitive process creating distinct units.
  • Primitively, tooth formation occurred throughout an organism's life.

Purpose of the Study:

  • To review the evolution of dental ontogeny across vertebrates.
  • To explore the developmental basis of tooth complexity and heterodonty.
  • To identify research gaps in understanding vertebrate dental evolution.

Main Methods:

  • Literature review of existing studies on vertebrate dental development.
  • Comparative analysis of tooth formation processes across different vertebrate groups.
  • Discussion of experimental findings and their evolutionary implications.

Main Results:

  • Teeth originated externally and secondarily entered the mouth, associating with bones.
  • Complex tooth shapes, like mammalian molars, arise from epithelial folding during development.
  • Heterodonty, or varied tooth types, has evolved independently in several vertebrate lineages, notably mammals.

Conclusions:

  • Mammalian dental development is complex and atypical among vertebrates.
  • Current experimental analysis of dental development is limited.
  • Further research on lower vertebrates, particularly fishes, is crucial for a comprehensive understanding of dental evolution.

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