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Atomic-force microscopic study of dimensional changes in human dentine during drying

J H Kinney1, M Balooch, G W Marshall

  • 1Chemistry and Materials Science Department, Lawrence Livermore National Laboratory, CA 94551.

Archives of Oral Biology
|November 1, 1993
PubMed
Summary

Drying human dentine samples caused minimal dimensional changes at the microscopic level. The measured drying-induced strain is negligible for tubule size and density calculations in dental research.

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Area of Science:

  • Biomaterials Science
  • Dental Materials Science
  • Nanotechnology

Background:

  • Dentine's structural integrity is crucial for dental restorations.
  • Understanding dimensional changes in dentine during drying is essential for accurate material property assessments.

Purpose of the Study:

  • To quantify drying-induced dimensional changes in human dentine using atomic-force microscopy.
  • To assess the impact of these dimensional changes on dentine microstructure.

Main Methods:

  • Prepared 1-mm thick human dentine sections (occlusal and buccal orientations).
  • Utilized atomic-force microscopy (AFM) to image samples in deionized water and during drying.
  • Applied Bernoulli beam elasticity theory to calculate engineering strain.

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Main Results:

  • No detectable dimensional changes (<0.5%) were observed over microscopic fields of view (<50x50 microns).
  • Significant vertical displacements (10-20 microns) were measured across the entire sample during drying.
  • Calculated engineering strain values were low (0.04%-0.09%) and alternated between tension and compression.

Conclusions:

  • Drying-induced strain in dentine is minimal at the microscopic scale.
  • Corrections for tubule size and density are not necessary for measurements using microscopic techniques.