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Related Experiment Videos

Changes in the permselectivity of human teeth during caries attack

G L Vogel1, Y Mao, C M Carey

  • 1American Dental Association Health Foundation, Paffenbarger Research Center, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Journal of Dental Research
|February 1, 1997
PubMed
Summary

Tooth permselectivity, or how well tooth tissues allow ions to pass, can be modified by surface-active agents. This study found that agents like phytate may decrease caries progression by altering tooth tissue ion selectivity.

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Area of Science:

  • Dental research
  • Biomaterials science
  • Ion transport mechanisms

Background:

  • Tooth permselectivity influences fluid composition during demineralization and remineralization.
  • Understanding these properties is crucial for developing caries prevention strategies.

Purpose of the Study:

  • To examine the permselectivity of human enamel, cementum, and dentin.
  • To investigate the effects of charged compounds (phytate and Zonyl-FSC) on tooth permselectivity.

Main Methods:

  • Microwell model to measure membrane potential developed by KCl diffusion.
  • Testing solutions simulating resting (pH 5.6) and cariogenic (pH 4.8) plaque fluids.
  • Assessing the impact of phytate and Zonyl-FSC on enamel, dentin, and cementum permselectivity.

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Main Results:

  • Enamel exhibited cation selectivity in resting conditions, shifting towards anion selectivity in cariogenic conditions.
  • Phytate treatment increased cation selectivity in enamel and dentin, with persistent effects.
  • Zonyl-FSC induced more negative membrane potentials in enamel, with transient effects, and minimal impact on dentin.

Conclusions:

  • Tooth permselectivity can be modified by surface-active agents.
  • Phytate demonstrates potential for sustained enhancement of cation selectivity, suggesting a viable approach to reduce caries progression.
  • Zonyl-FSC's effects are less persistent, indicating differential mechanisms of action.