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High resolution electron microscopic study on the human dentine crystal

Y Hayashi1

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

Journal of Electron Microscopy
|June 1, 1993
PubMed
Summary
This summary is machine-generated.

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High-resolution electron microscopy revealed the atomic structure of single dentine crystals, showing calcium atom arrangements similar to enamel hydroxyapatite. This technique offers insights into crystal plane characteristics when combined with diffraction data.

Area of Science:

  • Crystallography
  • Materials Science
  • Biomineralization

Background:

  • Dentine and enamel are key biomineralized tissues in teeth.
  • Understanding their atomic structure is crucial for biomaterials and dental research.
  • Previous studies have lacked direct atomic-level visualization of dentine.

Purpose of the Study:

  • To investigate the direct atomic images in single dentine crystals.
  • To clarify the unit cell and atomic arrangement within dentine.
  • To compare the atomic structure of dentine with that of enamel hydroxyapatite.

Main Methods:

  • High-resolution electron microscopy (HREM) was employed.
  • Direct atomic imaging of single dentine crystals was performed.
  • Analysis focused on (001) and (011) crystallographic planes.

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Main Results:

  • The unit cell of dentine was determined to be approximately 0.94 nm per side.
  • Six columnar calcium (Ca) atoms were identified within the unit cell.
  • The (001) plane image of dentine showed similarity to enamel hydroxyapatite.
  • Sublattice images revealed lattice fringes as linked atoms.
  • Image artifacts were observed due to variations in focus and specimen thickness.

Conclusions:

  • HREM provides direct atomic visualization of dentine crystal structure.
  • Dentine's atomic arrangement shares similarities with enamel hydroxyapatite.
  • Combining HREM atomic images with X-ray and neutron diffraction data can elucidate crystal plane characteristics.