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Effect of time interval between bleaching and bonding on tag formation
Renato Herman Sundfeld1, André Luiz Fraga Briso, Patricia Marra De Sá
1Department of Restorative Dentistry, Araçatuba School of Dentistry, Paulista State University, UNESP, Rua José Bonifácio 1193, CEP: 16015 050, Araçatuba, São Paulo, Brazil. sundfeld@terra.com.br
The Bulletin of Tokyo Dental College
|November 16, 2005
Summary
Waiting at least 7 days after bleaching enamel with 35% hydrogen peroxide before applying dental adhesives significantly improves material penetration. This ensures better bonding for resin composite restorations.
Area of Science:
- Dental Materials Science
- Biomaterials
- Adhesive Dentistry
Background:
- Dental bleaching with hydrogen peroxide is a common cosmetic procedure.
- The interaction between bleaching agents and dental adhesives can affect bond strength.
- Optimizing the timing of adhesive application after bleaching is crucial for restoration longevity.
Purpose of the Study:
- To evaluate the effect of different time intervals between 35% hydrogen peroxide bleaching and adhesive application on adhesive penetration into enamel.
- To determine the optimal waiting period for dental adhesive placement after enamel bleaching.
Main Methods:
- Extracted human teeth were bleached with 35% hydrogen peroxide and assigned to groups based on waiting times (0, 7, 14, 21 days) before adhesive application.
- Optical polarized light microscopy was used to assess adhesive penetration (resin tag length) at x400 magnification.
- Statistical analysis included ANOVA and Tukey's test to compare groups.
Main Results:
- Teeth restored 7, 14, or 21 days after bleaching showed significantly better adhesive penetration compared to those restored immediately after bleaching (0 days).
- The control group (unbleached teeth) also demonstrated good adhesive penetration.
- Immediate application of adhesive after bleaching (T0 group) resulted in inferior penetration.
Conclusions:
- A waiting period of at least 7 days is recommended between 35% hydrogen peroxide bleaching and the application of dental bonding agents.
- Allowing this interval optimizes adhesive penetration into bleached enamel, potentially leading to more durable restorations.