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Related Experiment Videos

Surface analysis of dentinal caries in primary teeth using a pH-imaging microscope.

Toru Nikaido1, Kayoko Moriya, Noriko Hiraishi

  • 1Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, 5-45 Yushima, 1-Chome, Bunkyo-ku, Tokyo 113-8549, Japan. nikaido.ope@tmd.ac.jp

Dental Materials Journal
|February 4, 2005
PubMed
Summary

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This study measured pH in primary teeth with caries using a pH-imaging microscope. Carious dentin showed lower pH than intact dentin, with severe lesions being more acidic.

Area of Science:

  • Pediatric Dentistry
  • Dental Caries Research
  • Biomedical Imaging

Background:

  • Dental caries is a prevalent disease in primary teeth.
  • Accurate pH measurement is crucial for understanding caries progression.
  • Existing methods may lack spatial resolution for detailed analysis.

Purpose of the Study:

  • To evaluate pH in intact and carious dentin of primary teeth.
  • To assess the capability of a pH-imaging microscope (SCHEM-100) for this purpose.
  • To compare pH values between intact, mild, and severe carious lesions.

Main Methods:

  • In vitro study using extracted human primary teeth.
  • Sections with mild or severe dentinal caries were analyzed.
  • A pH-imaging microscope (SCHEM-100) was utilized for pH measurement.

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  • Statistical analysis included Levene's test and Tukey HSD (p < 0.05).

    • Main Results:

    • Carious dentin exhibited lower pH values compared to intact dentin (pH 6.6).
    • Lowest pH in mild lesions was 6.2 (range 5.8-6.4).
    • Lowest pH in severe lesions was 6.0 (range 5.9-6.2).
    • Significant statistical differences were found between mild and severe lesions (p < 0.05).

    Conclusions:

    • The SCHEM-100 pH-imaging microscope effectively distinguished pH distributions in primary teeth.
    • Carious dentin in primary teeth has significantly lower pH than intact dentin.
    • A gradient of decreasing pH correlates with caries severity in primary dentin.