Purpose : The aim of this study was to evaluate the bleaching efficacy and safety of a hydrogen peroxide-based pre-filled tray-type at-home bleaching agent. The color stability after bleaching was also investigated.
Materials and Methods : The product used for the clinical trial was Opalescence Go (OPG), an at-home bleaching agent manufactured by Ultradent Japan. OPG is applied in trays pre-filled with bleaching gel. The main component of the bleaching gel is 6% hydrogen peroxide. A total of 20 participants performed at-home bleaching with OPG.
The changes in tooth color before and after bleaching were evaluated using intraoral photographic documentation and a colorimeter. Side effects regarding tooth sensitivity, gingival irritation, and gingival chemical burn during the bleaching period were investigated. Additionally, color reversion 12-18 months after bleaching was evaluated.
Results : The mean color difference (ΔE) immediately after 10 days of home bleaching for 90 minutes per day was 6.5, and the score difference was 4.0 when evaluated using the VITA Classical Shade Guide. After 12-18 months, the mean ΔE was 5.0 and the score difference was 2.9. There was no significant difference in the mean ΔE before bleaching and 12-18 months later (p>0.05), but a significant difference was observed in the mean value difference (p=0.046).
Discussion and Conclusion : OPG is a safe bleaching agent, but mild and transient hypersensitivity was frequently observed ; therefore, it is important to explain the risks of tooth bleaching to patients. Slight color changes were observed 12-18 months after bleaching.
