Influence of silica nanocoating on stain susceptibility and superficial integrity of dimethacrylate-based composites

Author(s)

Yanikian, Cristiane R. F. ^[1] ; Stape, Thiago H. S. ^{[2, 3]} ; Tezvergil-Mutluay, Arzu ^{[2, 3]} ; Martins, Luis R. M. ^[1]

Affiliation

^[1] Univ Estadual Campinas, Dept Restorat Dent, Piracicaba Dent Sch, Piracicaba, SP - Brazil

^[2] Univ Turku, Inst Dent, Dept Restorat Dent & Cariol, Adhes Dent Res Grp, Turku - Finland

^[3] Univ Turku, Turku Univ Hosp, TYKS, Turku - Finland

• Document type: Journal article
• Source: European Journal of Oral Sciences; v. 127, n. 4, p. 361-368, AUG 2019.
• Web of Science Citations: 0

Abstract

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 x 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 degrees 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, Delta 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 (Delta E-00 > 0.81) as early as 15 d of aging, with significantly higher Delta E-00 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. (AU)

• FAPESP's process: 13/18019-0 - Influence of silicon dioxide nanoparticles or acrylated polisiloxane on resin-based materials physical properties
• Grantee: Cristiane Rumi Fujiwara Yanikian
• Support Opportunities: Scholarships in Brazil - Master