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Related Experiment Videos

Microhardness of carious deciduous dentin.

Y Hosoya1, S J Marshall, L G Watanabe

  • 1Nagasaki University School of Dentistry, Department of Pediatric Dentistry, 1-7-1, Sakamoto, Nagasaki, 852-8588, Japan.

Operative Dentistry
|February 24, 2001
PubMed
Summary

This study measured deciduous dentin microhardness, finding significantly lower values in caries-affected areas compared to sound dentin. Dentin hardness decreases towards the pulp, especially under caries.

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Area of Science:

  • Dental Science
  • Materials Science

Background:

  • Dentin microhardness is a critical indicator of its structural integrity.
  • Caries significantly alters dentin's mechanical properties, but data on deciduous teeth is limited.

Purpose of the Study:

  • To quantify microhardness in deciduous dentin.
  • To compare microhardness across caries-affected and sound dentin regions at varying depths.

Main Methods:

  • Microhardness testing using a Knoop indenter on sectioned deciduous teeth.
  • Correlation with wet-scanning electron microscopy (wet-SEM) micrographs.
  • Statistical analysis using two-way ANOVA and Tukey-Kramer tests.

Main Results:

  • Dentin hardness generally decreases from the dentinoenamel junction towards the pulp.

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  • Caries-affected dentin exhibited significantly lower microhardness values than sound dentin.
  • Inner dentin regions showed lower hardness than outer/middle regions, particularly under caries.

    • Conclusions:

    • Caries profoundly reduces deciduous dentin microhardness.
    • Dentin's mechanical properties are position-dependent and significantly compromised by caries.
    • Findings highlight the structural vulnerability of carious deciduous dentin.