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Hydrogen Peroxide Diffusion through Enamel and Dentin.

Carmen Llena1, Oreto Martínez-Galdón2, Leopoldo Forner3

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|September 15, 2018
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This study found that repeated applications and light activation significantly increase hydrogen peroxide (HP) diffusion from dental bleaching products. These factors enhance HP diffusion regardless of the product

Keywords:
application timecarbamide peroxidedental bleachingdiffusionhydrogen peroxidelight activation

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Area of Science:

  • Dental Materials Science
  • Biomaterials
  • Tooth Whitening Technology

Background:

  • Dental bleaching agents, primarily hydrogen peroxide (HP) and carbamide peroxide (CP), are widely used for aesthetic improvement.
  • Understanding the diffusion kinetics of these agents through enamel and dentin is crucial for optimizing treatment efficacy and safety.
  • Variations in product formulation and application protocols may influence the release and penetration of active ingredients.

Purpose of the Study:

  • To investigate the in vitro diffusion characteristics of various commercial dental bleaching agents.
  • To compare the effects of different application protocols (frequency, duration, light activation) on hydrogen peroxide diffusion.

Main Methods:

  • Human enamel-dentin discs were used to simulate intraoral conditions.
  • Five commercial bleaching products (four HP-based, one CP-based) were tested under varied application protocols (3x10 min or 1x30 min, with/without light activation).
  • Diffused hydrogen peroxide was quantified using fluorimetry, and data were statistically analyzed (two-way ANOVA, Tukey's test).

Main Results:

  • Multiple applications (3x10 min) led to increased diffusion, with Perfect Bleach showing the highest diffusion after subsequent applications.
  • A single 30-minute application showed comparable diffusion for certain products (Pola Office+, Boost; Norblanc Office-automix, PolaDay CP).
  • Light activation significantly enhanced HP diffusion for Pola Office+, Boost, and Perfect Bleach compared to non-activated groups.

Conclusions:

  • Both repeated application intervals and light activation independently enhance hydrogen peroxide diffusion from bleaching agents.
  • These factors increase the diffusion of active compounds, suggesting potential for improved clinical outcomes.
  • The findings provide valuable insights for optimizing dental bleaching protocols for enhanced efficacy.