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Optical effects of experimental light-activated bleaching procedures.
Eva Klaric1, Mario Rakic, Marijan Marcius
11 Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb , Zagreb, Croatia .
Photomedicine and Laser Surgery
|February 22, 2014
Summary
This study found that light-activated bleaching using LED405 and higher peroxide concentrations significantly improved tooth whitening. Femtosecond lasers also showed promise for enhanced bleaching effects.
Area of Science:
- Dental materials science
- Photochemistry
- Biomaterials
Background:
- Conventional tooth bleaching relies on photothermal effects.
- Emerging light-activated methods (LED405, OLED, femtosecond laser) may offer photochemical benefits.
- Investigating novel light sources for improved bleaching efficiency is crucial.
Purpose of the Study:
- To evaluate the effectiveness of experimental light-activated bleaching procedures.
- To compare different light sources (LED405, OLED, femtosecond laser) in conjunction with various bleaching agents.
- To assess the impact of photochemical versus photothermal effects on tooth whitening.
Main Methods:
- Hydroxylapatite pastilles stained with green tea were used as a model system.
- Four groups were established based on light source: LED405, OLED, femtosecond laser, and a control (no light).
- Treatments involved 10-38% carbamide peroxide (CP) or hydrogen peroxide (HP) gels for 30 minutes, with color change measured by RGB colorimeter and UV/Vis/NIR spectroscopy.
Main Results:
- LED405 significantly increased the RGB index compared to OLED and no light activation (p<0.05).
- Femtosecond laser showed superior results with 16% CP and 38% HP.
- Higher peroxide concentrations in bleaching agents consistently enhanced the whitening effect, as indicated by the RGB index.
Conclusions:
- The mechanism of light activation significantly influences the color change achieved during bleaching.
- LED405 activation, particularly with higher peroxide concentrations, promotes superior tooth whitening.
- Further research into photochemical mechanisms can optimize light-activated bleaching protocols.
