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Influence of silica nanocoating on stain susceptibility and superficial integrity of dimethacrylate‐based composites
Author(s) -
Yanikian Cristiane R. F.,
Stape Thiago H. S.,
TezvergilMutluay Arzu,
Martins Luís R. M.
Publication year - 2019
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/eos.12627
Subject(s) - distilled water , composite material , materials science , profilometer , composite number , surface roughness , resin composite , stain , acrylic resin , staining , chemistry , coating , chromatography , medicine , pathology
The aim of this study was to investigate the ability of a novel silica (SiO 2 )‐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 SiO 2 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, Δ E 00 , 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 (Δ E 00 > 0.81) as early as 15 d of aging, with significantly higher Δ E 00 values recorded over time. Nanocoating with SiO 2 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 SiO 2 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.