A mixed-effect model was performed to assess shade changes and chi-square tests for the incidence of contact hypersensitivity, respectively.ĭental bleaching is frequently requested by patients who have discolored teeth. The incidence of contact hypersensitivity at each follow-up was recorded. Additionally, visual inspection (VI) using the Vitapan classical shade guide was also performed, and the correlation between the two measurements was analyzed by comparing the CIELab ( Δ E a b * ) values. Shade measurements were performed using a spectrophotometer (SP), and data were calculated with CIELab ( Δ E a b * ) and CIEDE2000 ( Δ E 00) formula. They were followed-up after 4 and 12 weeks. Participants were instructed to manually brush their teeth for 3 min, 3 times per day for 12 weeks. Forty-nine participants above A2 shade on the maxillary central incisor (#11) and canine (#13) were randomized into three groups: TW group (n = 15), 0.75 % HP-containing toothpaste (Toothwhole white) VL group (n = 15), 0.75 % HP-containing toothpaste (Vussen 7) and VH group (n = 17), 2.8 % of HP-containing toothpaste (Vussen 28).
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