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Related Experiment Videos

Current studies on tooth enamel development in lower vertebrates

M Wakita1

  • 1Department of Oral Anatomy II, Hokkaido University School of Dentistry, Sapporo, Japan.

Kaibogaku Zasshi. Journal of Anatomy
|August 1, 1993
PubMed
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Fish enameloid, a unique vertebrate tissue, shares similarities with mammalian enamel but has distinct developmental and compositional characteristics. Recent studies suggest enameloid and enamel may not be evolutionarily continuous, necessitating a phylogenetic re-evaluation.

Area of Science:

  • Comparative Vertebrate Paleontology
  • Biomineralization
  • Evolutionary Developmental Biology

Background:

  • Tooth enamel is a unique vertebrate tissue with distinct morphological and developmental features.
  • Vertebrate hard tissues are broadly classified into ectodermal enamel (amphibians) and mesodermal enameloid (fish).
  • Enameloid, found in fish, exhibits unique characteristics compared to mammalian enamel, despite functional analogies post-eruption.

Purpose of the Study:

  • To compare the structural and compositional characteristics of fish enameloid with mammalian enamel.
  • To investigate the mineralization process and crystal growth patterns in enameloid.
  • To re-evaluate the evolutionary relationship between enameloid and enamel based on recent findings.

Main Methods:

Related Experiment Videos

  • Histochemical analysis of enameloid matrix composition.
  • Immunohistochemical studies to assess protein expression.
  • Analysis of mineralization initiation via matrix vesicles.
  • Examination of crystal morphology and fluoride content.

    • Main Results:

    • Enameloid matrix is primarily composed of interwoven collagen fibrils.
    • Mineralization initiates through matrix vesicles, similar to bone and dentine.
    • Crystal growth in enameloid progresses from needle-like to hexagonal shapes, and it is rich in fluoroapatite.
    • Immunohistochemical data suggest a potential discontinuity in enameloid and enamel evolution.

    Conclusions:

    • Fish enameloid possesses unique developmental and compositional properties distinct from mammalian enamel.
    • The mineralization process and crystal habit in enameloid show specific patterns.
    • Recent evidence challenges the direct evolutionary continuity between enameloid and enamel, prompting a phylogenetic reconsideration.