Background and Aim: Bleached teeth are susceptible to discoloration. The aim of this study was to evaluate discoloration of bleached teeth following short-term use of several mouthwashes. Materials
and Methods: In this In-vitro experimental study, 48 extracted maxillary central incisorswere selected and divided into four groups of 12. All the teeth were subjected to external bleaching with 38% hydrogen peroxide [H2o2] . After bleaching, the teeth were immersed in in distilled water [control group or group 1] , chlorhexidine [CIx; group 2] , Irsha [group 3] or Persica [group 4] for three, seven and 14 days. The color change was assessed by a spectrophotometer at each time point and reported as INCREMENT El, INCREMENT E2 and INCREMENT E3. The results were analyzed by paired t-test, repeated measures ANOVA, one-way ANOVA and LSD test.
Results: Different mouthwashes [p: 0.0a3] and immersion times [p: 0.03g] caused significantly variable color change in bleached teeth. After 14 days of immersion, the color change of samples in Persica group had significant differences with that of other goups [p<0.000] . The results of repeated measures ANOVA was only significant for the persica group indicating significant color change over time. Thus, paired t-test was applied for pairwise comparison of the time points, which revealed significant differences between INCREMENT EI and INCREMENT E3 and also INCREMENT E2 and INCREMENT E3 [p<0.0S] .
M. R. Maleki Pour ,F. Shirani ,H. Mazaheri ,M. Moghtadaei ,M. Ghasemi ,
[Effects of mouthwashes on color stubitity of hleached teeth],
J. Dent. Biomater. 2015;
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