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Two in-office bleaching systems: a scanning electron microscope study.

J Gultz1, J Kaim, W Scherer

  • 1Division of Restorative and Prosthodontic Sciences, New York University College of Dentistry, New York, USA.

Compendium of Continuing Education in Dentistry (Jamesburg, N.J. : 1995)
|January 29, 2000
PubMed
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Heated and light-absorbing bleaching agents did not alter human enamel surface morphology. Only phosphoric acid etching created a visible etching pattern on the enamel, indicating its distinct effect on dental surfaces.

Area of Science:

  • Dental Materials Science
  • Biomaterials
  • Surface Morphology Analysis

Background:

  • Dental bleaching agents are widely used for aesthetic purposes.
  • Understanding their effects on enamel surface integrity is crucial for safe clinical application.
  • Previous research has yielded mixed results regarding the impact of bleaching agents on enamel.

Purpose of the Study:

  • To investigate the effects of heated and light-absorbing bleaching agents on human enamel surface morphology.
  • To compare these effects with those of a standard phosphoric acid etchant.
  • To utilize scanning electron microscopy (SEM) for detailed morphological analysis.

Main Methods:

  • Twelve human anterior teeth were divided into four groups: control, heated bleaching agent, light-absorbing bleaching agent, and phosphoric acid etchant.

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  • Bleaching agents and etchant were applied to enamel surfaces according to manufacturer instructions.
  • Specimens were examined using scanning electron microscopy (SEM) to evaluate surface changes.
  • Main Results:

    • SEM analysis revealed no significant alterations in enamel surface morphology for teeth treated with heated or light-absorbing bleaching agents compared to the control group.
    • Teeth treated with 35% phosphoric acid etchant exhibited a distinct etching pattern on the enamel surface.
    • No adverse morphological changes were observed in the enamel treated with bleaching agents.

    Conclusions:

    • Heated and light-absorbing bleaching agents, as used in this study, do not appear to cause surface morphological changes to human enamel.
    • Phosphoric acid etching, however, demonstrably alters enamel surface morphology, creating an etching pattern.
    • Clinicians should be aware of the distinct effects of etchants versus bleaching agents on dental enamel.