PATIENT SATISFACTION WITH AT-HOME DENTAL BLEACHING USING VIVERA OR ESSIX RETAINERS: A RANDOMIZED CLINICAL TRIAL

Forty patients (n=40) will be randomized as to which side will receive the type of bleaching tray, essix-type retairner or Vivera retainer. The at-home bleaching will be performed with 10% carbamide peroxide (Opalescence PF 10%) for 2 hours The treatment lasted 4 weeks, although as each retainer was worn every other day, the actual application time was 2 weeks. Patient´s satisfaction will be evaluated at baseline, after one, two weeks, and 4 weeks with an apropriate questionnaire using a visual analog scale (EVA 0-10). The color will be assessed at baseline, after one, two and four weeks using subjective color guides (VITA Classical and VITA Bleachguide 3D-MASTER) and a objective digital spectrophotometer (VITA Easyshade). The intensity and absolute risk of tooth sensitivity and gingival irritation will also be determined with a visual analog scale (EVA 0-10). Color change between groups will be compared by paired Student´s t-test. The absolute risk of tooth sensitivity and gingival irritation for both groups will be compared by McNemar test. Also, odds ratios, confidence intervals, and Spearman correlation will be determined. The intensity of tooth sensitivity, gingival irritation and patient´s satisfaction will be compared by paired Student´s t-test. The level of statistical significance accepted will be 5% for all analyses.