Clinical evaluation of in office, at home and combined bleaching
Objectives: The aim of this randomized clinical trial was to compare the whitening effect of in office, at home and combined bleaching treatments (office bleaching followed by at home bleaching), and to evaluate the longevity of the whitening effect at 6 month post bleaching.
Materials and Methods: A total of 45 subjects aged 18 years and older (24,95±4,48 years), with a mean shade of A3 and darker for the six maxillary anterior teeth were assigned to in office (Beyond Office max; 35% hydrogen peroxide, 30 minutes, three times over three weeks), at home (Opalescence PF; 15% carbamide peroxide, in trays 8 hours a day for two weeks) and combined bleaching (Beyond Office max; 35% hydrogen peroxide, 30 minutes followed by Beyond stay white; 6% hydrogen peroxide, in trays 4 hours a day for two weeks), treatment groups (n=15). Shade evaluation was performed with a spectrophotometer (Vita Easyshade) at baseline, 1 week and 6 months post bleaching. Data of the color parameters were analyzed using repeated ANOVA, Newman Keuls and Tukey multiple comparison tests (p<0.05).
Results: Whitening effect of in office treatment (ΔE=12,56±3,18) was significantly lower (p=0,002) than at home bleaching (ΔE=14,57±4,2) which was not different from combined bleaching treatment (ΔE=13,5±3,91) (p>0.05). At 6 month recall, tooth shade remained significantly lighter than at baseline in all bleaching treatments according to the color parameters ΔL, Δa, Δb, ΔE (p<0.0001). Shade relapse at 6-month recall, of in office (ΔE=11,93±3,46), at home (ΔE=13,96±4,97) and combined bleaching (ΔE=12,92±4,06) was not statistically different from 1 week post bleaching.
Conclusions: All of the bleaching treatments caused significantly color changes however the whitening effect and longevity of the whitening effect at 6 month post bleaching of at home bleaching was superior than in office bleaching.