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Related Experiment Videos

pH variation among materials used for intracoronal bleaching.

I Rotstein1, S Friedman

  • 1Department of Endodontics, The Hebrew University--Hadassah Faculty of Dental Medicine, Jerusalem.

Journal of Endodontics
|August 1, 1991
PubMed
Summary

The pH of bleaching materials used for pulpless teeth was measured. Alkaline sodium perborate mixed with acidic 30% hydrogen peroxide resulted in an alkaline paste, challenging theories linking acidic pH to root resorption.

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Area of Science:

  • Endodontics
  • Dental Materials Science

Background:

  • Intracoronal bleaching of pulpless teeth with 30% hydrogen peroxide is linked to external cervical root resorption.
  • The pH of bleaching agents is a suspected etiological factor, but existing data are conflicting.

Purpose of the Study:

  • To accurately measure the pH of commonly used intracoronal bleaching materials.
  • To investigate the influence of material concentration and time on pH.

Main Methods:

  • Measured the pH of sodium perborate and 30% hydrogen peroxide (alone and combined) over 14 days.
  • Evaluated different concentrations and clinical consistency mixtures.

Main Results:

  • Sodium perborate was alkaline; 30% hydrogen peroxide was acidic.

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  • Mixtures became increasingly alkaline with higher sodium perborate concentrations.
  • Clinical consistency mixtures were alkaline and increased in alkalinity over time.

    • Conclusions:

    • The study's findings do not support the hypothesis that an acidic pH of bleaching pastes causes external cervical root resorption.
    • The alkalinity of common bleaching mixtures suggests other factors may be involved in this complication.