Bleaching Effect of Blue-Violet-Diode-Laser Irradiation to Tooth Enamel with TiO₂ Application

Abstract

Purpose: To investigate bleaching effect of Blue-Violet-Diode-Laser irradiation to tooth enamel with TiO₂ agent.
Methods: Blue-Violet-Diode-Laser (Nichia), Light Surge (Osada) and Opelaser 03SII (Yoshida) were used as light source for the experiment. TiO₂ as the bleaching agent was applied to human enamel, and the surface was irradiated by Blue-Violet-Diode-Laser. The tooth color was evaluated by L*a*b* color system. A handysurf E-30A (Tokyo Seimitsu) was used for measuring the roughness of the enamel surface (Ra) before and after treatment.
Results: ΔE levels in the Blue-Violet-Diode-Laser irradiation groups were significantly higher than the other laser treatment groups. The post-treatment Ra in the two groups showed no signi.cant difference compared with the pre-treatment levels.
Conclusion: This study suggest that the Blue-Violet-Diode-Laser irradiation could enhance the bleaching effect with TiO₂.