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The influence of time interval between bleaching and enamel bonding
Jéfferson Da Silva Machado1, Maria Salete Machado Cândido, Renato Herman Sundfeld
1Discipline of Restorative Dentistry, Adamantina Dental School, FAE, Brazil.
Summary
Waiting at least 7 days after dental bleaching improves adhesive material penetration into enamel. This interval ensures better composite resin restorations by allowing normal bonding agent interaction with the enamel surface.
Area of Science:
- Dental materials science
- Biomaterials research
- Restorative dentistry
Background:
- Dental bleaching agents, such as carbamide peroxide and hydrogen peroxide, are widely used for aesthetic improvements.
- The interaction between bleached enamel and dental adhesives can affect the success of restorative procedures.
- Understanding the optimal timing for bonding after bleaching is crucial for clinical practice.
Purpose of the Study:
- To investigate the penetration of conventional adhesive materials into enamel previously bleached with 16% carbamide peroxide and 38% hydrogen peroxide.
- To evaluate the effect of different time intervals between bleaching and bonding on adhesive penetration.
- To determine the optimal waiting period for achieving successful composite resin restorations after dental bleaching.
Main Methods:
- Extracted human teeth were divided into eight groups based on bleaching agent and time interval post-bleaching (immediate, 7, 14, 30 days).
- A control group received restorations without prior bleaching.
- Resin tag length was measured using optical light microscopy at 400x magnification to assess adhesive penetration.
Main Results:
- Adhesive material penetration into bleached enamel was significantly better when restorations were performed 7, 14, or 30 days after bleaching compared to immediate restoration.
- No statistically significant differences were found between the two bleaching agents used (16% carbamide peroxide and 38% hydrogen peroxide).
- The interaction between the bleaching agent and the time interval did not yield statistically significant differences.
Conclusions:
- A minimum waiting period of 7 days between dental bleaching and the application of adhesive bonding agents is recommended for composite resin restorations.
- Allowing adequate time after bleaching is fundamental for the normal penetration of conventional one-bottle adhesive systems onto the enamel surface.
- This finding has significant clinical implications for optimizing the longevity and success of aesthetic dental treatments.