ABSTRACT
Due to the growing popularity of vital bleaching by Carbamide Peroxide it is imperative to understand the effect of such agents on enamel and dentine. The purpose of this study was to evaluate the effect of a 16% carbamide peroxide bleaching gel; Vivastyle on enamel staining susceptibility.Thirty bovine specimens were selected and randomly divided into two groups of fifteen. The experimental group was subjected to Vivastyle gel and then was immersed in coffee, for half an hour daily for three weeks. The control group was only immersed in coffee. The teeth were evaluated by colorimeter readings to measure L*, a*, b* of each tooth. Total color differences between two colors [DELTAE] were calculated using the following formula: DELTAE= [[DELTAL*] 2 + [DELTAa*] 2+ [DELTAb*] 2]. DELTAE1 represent color difference after bleaching; DELTAE2: bleached and immersed in coffee, and DELTAE3 immersed in coffee. Mean color difference were: 9.478, 13.808, and 7.230 for DELTAE1, DELTAE2, and DELTAE3 respectively. Paired comparison by Duncan test showed that there was a significant difference between DELTAE1 and DELTAE2 [P0.000]. t-test showed that there was no significant difference between DELTAE3 and DELTAE1. [P=0.08], however, DELTAE3 had significant difference with DELTAE2 [P0.000].After vital bleaching, the enamel staining susceptibility is significantly increased