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Related Experiment Videos

Microstructural features of dipnoan tooth enamel.

M Ishiyama1, Y Teraki

  • 1Department of Histology, Nippon Dental University, School of Dentistry, Niigata, Japan.

Archives of Oral Biology
|January 1, 1990
PubMed
Summary

The hypermineralized surface layer of lungfish tooth plates is likely enamel, originating from ectodermal cells. This study used advanced microscopy to analyze the tooth plate

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Area of Science:

  • Paleontology
  • Developmental Biology
  • Mineralized Tissue Biology

Background:

  • Lungfish tooth plates possess a unique hypermineralized surface layer.
  • The precise composition and origin of this layer remain incompletely understood.

Purpose of the Study:

  • To investigate the ultrastructure and origin of the hypermineralized surface layer of extant lungfish tooth plates.
  • To determine if this layer represents true enamel.

Main Methods:

  • Contact microradiography
  • Light microscopy
  • Transmission Electron Microscopy (TEM)

Main Results:

  • TEM revealed the surface layer's matrix comprises organic filamentous material, notably lacking collagen fibers.
  • This matrix appears to be secreted by oral epithelial cells adjacent to the tooth plate.
  • Deposition occurs between the cell membrane and a basal lamina-like structure.

Conclusions:

  • The findings suggest the hypermineralized surface layer of lungfish tooth plates is enamel.
  • The origin of this enamel is ectodermal, consistent with vertebrate enamel formation.

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