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Related Experiment Videos

Plaque pH and associated parameters in relation to caries.

Y M Dong1, E I Pearce, L Yue

  • 1School of Stomatology, Beijing Medical University, Beijing, People's Republic of China.

Caries Research
|October 26, 1999
PubMed
Summary

Plaque acidogenicity, or its ability to produce acid, is less strongly linked to cavities than previously thought. Factors like the frequency of acid-producing events, not just their intensity, are more critical for cavity development.

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Area of Science:

  • Dental Research
  • Microbiology
  • Public Health

Background:

  • Previous research suggested a strong link between plaque acidogenicity and caries proneness.
  • Emerging evidence indicates this relationship may be weaker than initially believed.

Purpose of the Study:

  • To investigate plaque acidogenicity variables in children with varying caries prevalence and incidence.
  • To analyze the influence of plaque mineral content (calcium, phosphorus, fluoride) on acidogenicity.

Main Methods:

  • Measured plaque pH in high-caries and caries-free 12-year-old children using an iridium oxide electrode after a sucrose rinse.
  • Analyzed supragingival plaque for calcium, phosphorus, and fluoride content.
  • Utilized a plaque pH analysis program to average Stephan curves.

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Main Results:

  • Caries-free subjects exhibited higher maximum plaque pH and faster pH recovery post-sucrose rinse.
  • Caries-free subjects showed lower enamel dissolution capacity and less time below pH 7.0.
  • Upper arch plaque was more acidogenic than lower arch plaque, with strong intra-individual correlation.
  • Plaque mineral content (Ca, P, F) showed minimal influence on key acidogenicity parameters.

Conclusions:

  • The direct relationship between principal acidogenicity parameters and caries prevalence/activity was not strongly supported in this study.
  • Differences in plaque location (fissure vs. smooth surface), temporal variations, and fluoride toothpaste use may explain findings.
  • The frequency of acidogenic episodes appears more critical for caries progression than the intensity of acid production during a single episode.