One‐year bleaching efficacy using two HP products with different pH: A double‐blind randomized clinical trial

Abstract

Objectives This split‐mouth, double‐blind, randomized clinical trial evaluated the 1‐year bleaching efficacy produced by two hydrogen peroxide gels with different pHs. Materials and Methods Twenty‐eight patients were divided into two groups corresponding to two different products: Pola Office (pH = 2.0/SDI) and Pola Office Plus (pH = 7.0/SDI). The treatment was assessed during and after the bleaching procedure up to 12 months post‐treatment. The assessment consisted of two bleaching scales shade guide units (ΔSGU) and spectrophotometric device (ΔE, ΔE00, and Whiteness Index) of both maxillary quadrants. Results for ΔSGUs in both scales and ΔE00 and Whiteness Index were compared using Mann Whitney test and ΔE measurements through the t‐Student test for paired samples in each evaluation time. The color rebound (1‐ vs 12‐month postbleaching data) was evaluated with Wilcoxon test (alpha = .05). Results During the different times of evaluation, the color variation was similar for both products (P > .05), both for subjective (ΔSGUs) and objective assessments (ΔE, ΔE00, and Whiteness Index). Also, both products showed a slight rebound after 12‐month postbleaching (P > .05). Conclusions Concerning the stability of color, in‐office dental whitening with two hydrogen peroxide gels of different pHs produced similar results, with no significant of regression, for 12 months postwhitening. Clinical Significance Bleaching using a neutral (pH = 7.0) in‐office gel demonstrated similar stability and rebound effect than an acidic one (pH = 2.0).

Effects of a reduced in‐office bleaching protocol with 37.5% hydrogen peroxide on effectiveness and tooth sensitivity: A double‐blind randomized clinical trial

“…We found that both treatment groups promoted perceptible and acceptable tooth color changes, 31,33 since ∆E ab * and ∆E 00 values were above 50:50% PT and AT thresholds determined by the ISO/TR 28642:2016, 34 where PT and AT thresholds are 1.2 and 2.7 for CIEL*a*b*, and 0.8 and 1.8 for CIEDE2000, respectively 31‐33 . These results were similar to those obtained in studies that found that the pH of 35% (acidic) or 37.5% (neutral) HP whitening gels no influenced in the effectiveness and longevity of in‐office bleaching 7,17 …”

“…In the present study, shade evaluations were performed objectively with a spectrophotometer which is considered more accurate than visual one 36 . Color differences were calculated using both ∆E ab *, that is the metric more used for evaluate color changes after tooth whitening 2,7,9,11,13,14 and ∆E 00 7,31,33 that shows a better correlation with visual perception than ∆E ab * 31,36 . Regardless of number of bleaching gel changes, it was observed a similar tendency for both color differences formulas (∆E ab * and ∆E 00 ).…”

“…However, patients´ demand for faster whitening results and their resistance to using trays for a prolonged time has increased the interest for in‐office tooth bleaching. In this technique, dentists usually employ hydrogen peroxide (HP) high‐concentrated (20%–40%), and the 35% HP has been the most commonly used 1,7‐10 . The in‐office bleaching is usually done with two or three clinical sessions, and the duration of each session varies according to the contact time of the bleaching gel or its number of applications.…”

Assessment of the effect of experimental bleaching agent with nano‐bioactive material on postoperative sensitivity: A randomized, triple blind clinical trial

“…k L , k C , and k H , the parametric factors, are correction terms for experimental conditions. And finally, R T is a rotation function that accounts for the interaction between chroma and hue differences in the blue region 47,48 …”

One‐year follow‐up evaluation of reservoirs in bleaching trays for at‐home bleaching

“…Although some RCTs have already addressed color stability of bleaching protocols, 14–18 none of them have focused on the type of bleaching tray used for the at‐home bleaching. Therefore, this study aimed to evaluate whether the presence of reservoirs may affect color change stability and bleaching sensitivity one‐year after at‐home bleaching.…”