An in vitro comparison of herbal bleaching agent with sodium perborate in the discolored teeth

The purpose of this study was a comparison between effectiveness of a new herbal bleaching material with combination of sodium perborate and distilled water. In this study, 27 permanent anterior teeth with intact crowns were selected and discolored intentionally by inserting them in whole blowhole centrifuged at 2500 rpm for 30 minutes three times a day for 3 days. The bleaching materials tested in each of these 3 groups were: group 1: a mixture of sodium perborate and hydrogen peroxide 35%, group 2: a mixture of herbal bleaching agent and distilled water, and group 3: a mixture of sodium perborate and distilled water. At 7 & 12 days, the teeth were reopened, bleached and placed back into the vials with distilled water. The teeth were photographed at days 1, 7, 12 and 17 after bleaching intervals. Teeth whitening were rated by consensus of 2 evaluators in 3 grades: grade 1 as no change or very slight change, grade 2 as mild change and no acceptable color and grade 3 as an acceptable color change. For statistical analysis, Kruskal-Wallis and Mann-Whithnet tests were used and significance level was p<0.05. The mixed sodium perborate and distilled water was significantly better than herbal material after 12 days (p=0.006) but no significant difference was found out between them after 17 days (p=0.16). Based on the findings of this research study, the new herbal bleaching material could have the same results as the mixed perborate and water.