Evaluation of experimental resin infiltrant containing nanohydroxyapatite on color stability and microhardness in demineralized enamel

Abstract

The aim of the study was to evaluate the in uence of the incorporation of 10% nano-hydroxyapatite into an experimental resin in ltranton color stability and cross-sectional microhardness. Material and methods135 blocks were divided into ve groups: H: healthy; MB: white spot; I: Icon®; E: experimental; EH: experimental containing 10% nano-hydroxyapatite. For color evaluation (n = 15), CIEL*a*b* values were obtained at the following time points: T0 (before immersion), T1 (14 days after immersion), and T2 (28 days after). Data were applied to CIEDE2000 formula. Cross-sectional microhardness (n = 12) data from the MB, I, E, and EH groups were applied to the mineral loss formula (∆S). Polarized Light Optical Microscopy images were obtained (n = 5) at 40x magni cation. Shapiro-Wilk test was used to assess data normality for color stability and mineral loss. One-way ANOVA analysis was performed, followed by Bonferroni's post hoc test (color stability) and Tukey's test (mineral loss). ResultsIn color stability results, regardless of time, there was no signi cant difference between H and MB groups; at 14 days and at 28 days, MB differed from all in ltrated groups, and H differed from E and EH. For ∆S, MB group showed a signi cant difference compared to I and EH groups but did not differ from E. ConclusionE and EH showcased similar performance to I regarding color variation. In terms of ∆S, I and EH had less mineral loss, suggesting a reinforcement of the dental structure.