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High resolution electron microscopy in the dentino-enamel junction.

Y Hayashi1

  • 1Department of Conservative Dentistry, Faculty of Dentistry, Kyushu University, Fukuoka, Japan.

Journal of Electron Microscopy
|October 1, 1992
PubMed
Summary

High-resolution electron microscopy reveals direct crystal connections at the dentino-enamel junction. This direct crystal fusion suggests the junction may be vulnerable to mechanical and chemical damage.

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Area of Science:

  • Biomineralization
  • Materials Science
  • Dental Research

Background:

  • The dentino-enamel junction (DEJ) is a critical interface in tooth structure.
  • Understanding the microstructural properties of the DEJ is essential for explaining tooth mechanical behavior and failure modes.

Purpose of the Study:

  • To investigate the direct crystal-to-crystal connection at the human dentino-enamel junction.
  • To elucidate the microstructural characteristics of crystal fusion at the DEJ.

Main Methods:

  • High-resolution electron microscopy (HREM) was employed to examine the crystal structure at the DEJ.
  • Analysis focused on the lattice fringes and boundary interfaces between dentine and enamel crystals.

Main Results:

  • HREM confirmed direct contact between dentine and enamel crystal lattice fringes at the DEJ.
  • Intricate tilt boundaries, formed by dislocations, were observed at the fusion levels.
  • Dentine crystals exhibited closer joining and more regular curvature in tilt boundaries compared to the DEJ.

Conclusions:

  • Dentine crystal growth directly integrates with enamel crystals at the DEJ.
  • The observed microstructural features suggest the DEJ may represent a weak point susceptible to mechanical and chemical challenges.

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