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Related Experiment Videos

In vitro tooth color change with repeated bleaching.

S F Rosenstiel1, A G Gegauff, R J McCafferty

  • 1Ohio State University, College of Dentistry, Columbus 43210-1241.

Quintessence International (Berlin, Germany : 1985)
|January 1, 1991
PubMed
Summary

Vital tooth bleaching with hydrogen peroxide showed significant color change after the first treatment. Repeated bleaching sessions offered minimal additional lightening, suggesting limited benefit beyond initial application.

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Area of Science:

  • Dental materials science
  • Aesthetic dentistry
  • Tooth whitening efficacy

Background:

  • Growing patient demand for vital tooth bleaching.
  • Limited objective data on necessary treatment sessions and expected lightening outcomes.
  • Need for evidence-based guidelines in dental bleaching procedures.

Purpose of the Study:

  • To quantify color changes in bleached extracted teeth.
  • To compare the efficacy of hydrogen peroxide bleaching against control groups.
  • To evaluate the impact of repeated bleaching treatments on tooth color.

Main Methods:

  • Utilized extracted human teeth for controlled experimental conditions.
  • Group A: Bleaching with 35% stabilized hydrogen peroxide after etching.

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  • Group B: Control for etching effect (water instead of peroxide); Group C: Untreated control.
  • Color change measurement using a standardized colorimeter after one and six treatments.

    • Main Results:

    • Significant color difference (ΔE) observed after one bleaching treatment: 3.33 (Group A), 1.67 (Group B), and 0.48 (Group C).
    • After six treatments, overall color differences were 3.82 (Group A), 2.41 (Group B), and 1.38 (Group C) (P < .01).
    • Color changes diminished considerably after the initial treatment, indicating a plateau effect.

    Conclusions:

    • A single session of 35% hydrogen peroxide bleaching yields substantial tooth lightening.
    • Subsequent bleaching treatments provide marginal additional aesthetic improvement.
    • The study suggests limited clinical benefit from multiple repeated bleaching sessions under the tested conditions.