Methods: Opalescence 10% (Ultradent Co.)was used as an experimental material. The subjects were 7 patients in their 20s, and whitening of the labial surfaces of the 6 maxillary anterior teeth were performed. Gum coverage type custom trays with a reservoir on the right side and without a reservoir on the left were designed to cover the gingiva.
Whitening was performed daily for 2 hours for 14days,and measurement was performed before and 7 and 14 days after treatment. Color (L*a*b*)was assessed using a colorimeter(Shadepilot, Dentsply sankin Co.),and three−way ANOVA of color differences(ΔEab*)was performed.
Results: Regarding whitening effects, the color difference (ΔEab*)between before and after treatment was 5.91 and 7.70, after 7 and 14 days, respectively. A significant difference was noted in color differences between after 7 and 14days. Regarding the form of custom tray, the color difference was 7.38 on the side with and 6.24 on the side without a reservoir. The whitening effect was significantly greater with than without a reservoir. Regarding color differences among tooth types, the difference was 5.11 in the central incisor, showing a low value, and 6.71 in the lateral incisor, and 8.61 in the canine.
Conclusions: It was revealed that Opalescence 10% was clinically effective as whitening material. The whitening effect was higher with custom trays with reservoirs. Canines showed the highest color difference among anterior teeth.