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A scanning electron microscope study of monkey maturation-stage ameloblasts.

Z Skobe1, K S Prostak, D N Stern

  • 1Forsyth Dental Center, Boston, Massachusetts 02115.

Journal of Dental Research
|November 1, 1988
PubMed
Summary
This summary is machine-generated.

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The enamel organs of macaque monkeys show cell morphology similar to continuously erupting rat incisors. Researchers found minor differences, including unique membrane configurations and larger blood vessels in the papillary layer.

Area of Science:

  • Dental Biology
  • Comparative Anatomy
  • Microscopy

Background:

  • Ameloblasts are crucial for enamel formation.
  • Understanding ameloblast morphology aids in comprehending tooth development and eruption dynamics.
  • Primate enamel organ development is a key area in comparative dental research.

Purpose of the Study:

  • To compare the morphology of maturation-stage enamel organs in Macaca arctoides and Macaca mulatta with continuously erupting rat incisors.
  • To identify similarities and differences in ameloblast cell structure between primates and rats.
  • To investigate the ultrastructural characteristics of primate ameloblasts during tooth development.

Main Methods:

  • Scanning electron microscopy was employed to examine enamel organs from Macaca arctoides and Macaca mulatta permanent dentition.

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  • Specimens were fixed and processed using standard electron microscopy techniques, including critical-point drying and metal coating.
  • Enamel organs were carefully separated from enamel before microscopic analysis.

    • Main Results:

    • Few morphological differences were observed in maturation-stage ameloblasts between the studied primates and other reported species.
    • Apical plasma membrane configurations in primate ameloblasts included smooth, ruffle-ended, maze, microvillous, and ridge patterns, with an additional interdigitating bulbous extension type.
    • Blood vessels in the papillary layer of primate enamel organs were approximately 7 microns in diameter, significantly larger than those found in rats.

    Conclusions:

    • Primate ameloblast morphology during maturation is largely conserved across species, showing similarities to continuously erupting rodent incisors.
    • Specific apical plasma membrane configurations and larger papillary layer blood vessels represent notable distinctions in primate enamel organs.
    • These findings contribute to the comparative understanding of ameloblast function and vascularization in primate tooth development.