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Related Experiment Videos

Nightguard vital bleaching: effects on enamel surface texture and diffusion.

V B Haywood1, T Leech, H O Heymann

  • 1Department of Prosthodontics, University of North Carolina, Chapel Hill 27599-7450.

Quintessence International (Berlin, Germany : 1985)
|October 1, 1990
PubMed
Summary

This study found that 10% carbamide peroxide bleaching of vital teeth did not alter enamel surface texture. The tooth whitening effects extended beyond direct contact areas without causing etching.

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Area of Science:

  • Dentistry
  • Dental materials science

Background:

  • Vital tooth bleaching is a common cosmetic procedure.
  • A new technique uses 10% carbamide peroxide with a mouthguard, omitting enamel etching or polishing.

Purpose of the Study:

  • To evaluate the in vitro effects of 10% carbamide peroxide bleaching on dental enamel surface texture.
  • To determine if the bleaching agent causes surface alterations without prior enamel conditioning.

Main Methods:

  • Thirty-three extracted human teeth were treated with 10% carbamide peroxide for a duration simulating 5 weeks of nighttime application.
  • A portion of each tooth was masked to serve as a control.
  • Epoxy replicas of treated and control enamel surfaces were examined using scanning electron microscopy.

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Main Results:

  • All discolored teeth showed lightening, with color changes observed in both treated and untreated (control) areas.
  • Scanning electron microscopy revealed no apparent etching or difference in surface texture between the carbamide peroxide-treated enamel and the control areas.

Conclusions:

  • The tested 10% carbamide peroxide bleaching technique does not appear to negatively affect dental enamel surface texture in vitro.
  • The observed tooth whitening effect may penetrate beyond the directly treated enamel surface.