Effects of microabrasion association to at‐home bleaching on hydrogen peroxide penetration and color change

Purpose This study aimed to quantify the penetration of hydrogen peroxide (HP) inside the pulp cavity and color change with two different concentrations of HP to at‐home bleaching associated or not with enamel microabrasion (MA). Methods Forty healthy premolars were randomly divided in four groups (n = 10): only HP4%, MA + HP4%, only HP10%, MA + HP10%. The concentration (μg/ml) of HP was assessed using UV–Vis spectrophotometry. The color change (ΔEab, ΔE00 and WID) was evaluated before and one‐week after bleaching. Data were evaluated for a two‐way ANOVA and the Tukey's test (α = 0.05). Results The application of MA increased the amounts of HP inside the pulp chamber when compared to without MA, as well as PH10% when compared to PH4% (p