Biomodification of the dentin substrate by the proposed strategy using DMSO is a suitable approach to produce more durable hybrid layers with superior ability to withstand hydrolytic degradation over time. Although the active role of DMSO on dentin bond improvement may vary according to monomer composition, its use seems to be effective on both self-etch and etch-and-rinse bonding mechanisms.

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The aim of this study was to investigate the ability of a novel silica (SiO2)‐based nanocoating approach to extend the superficial integrity of current composites. Cylindrical discs (7 × 2 mm) were produced from nanohybrid and nanofilled composites. Specimens in control groups were not coated, but SiO2 nanocoating was performed on specimens in experimental groups (n = 8). Specimens were stored for 24 h in distilled water at 37°C (baseline) and then artificially aged for 15, 90, or 180 d in a low‐pH staining solution. Surface roughness (Ra) was measured using a profilometer, and a goniometer was used to determine surface free energy (SFE). Color change was evaluated by a reflectance spectrophotometer, applying the color distance metric, ΔE00, according to the Commission Internationale de l'Eclairage (CIE) L*a*b* coordinates. Data were subjected to repeated‐measures anova and the Tukey post‐hoc test. Composites presented visually perceptible color changes (ΔE00 > 0.81) as early as 15 d of aging, with significantly higher ΔE00 values recorded over time. Nanocoating with SiO2 significantly reduced the SFE of composites at all storage times, and significantly lower Ra values were identified after aging. Nanohybrid and nanofilled composites were susceptible to substantial hydrolytic superficial degradation and staining, which was dramatically attenuated by the proposed SiO2 nanocoating approach. Nanocoating effectively lowered the SFE of composites, thus minimizing water–composite interactions, which contributed to reduced superficial deterioration and lower stain susceptibility over time.

Milton. Agradeço por fazerem parte da construção do meu ser e de me acolherem nos momentos mais di ceis.Ao Prof. Dr. Luís Roberto Marcondes Mar ns pela orientação e amizade, pela confiança que sempre teve em meu trabalho e pelo incen vo ao meu desenvolvimento como ser humano. Seu maior ensinamento foi de que a família é mais importante do que qualquer notoriedade.