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Color stability of a bis‐acryl composite resin subjected to polishing, thermocycling, intercalated baths, and immersion in different beverages
Author(s) -
Macedo Maria Gracinda F. P.,
Volpato Claudia A. M.,
Henriques Bruno A. P. C.,
Vaz Paula C. S.,
Silva Filipe S.,
Silva César F. C. L.
Publication year - 2018
Publication title -
journal of esthetic and restorative dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.919
H-Index - 60
eISSN - 1708-8240
pISSN - 1496-4155
DOI - 10.1111/jerd.12404
Subject(s) - polishing , lightness , materials science , wine , significant difference , acrylic resin , immersion (mathematics) , composite material , dentistry , food science , chemistry , mathematics , medicine , coating , optics , physics , statistics , pure mathematics
Objective To evaluate the color of a bis‐acryl resin after polishing, aging, and colorants. Materials and Methods From the 140 disks obtained, 35 were not polished (NP), 35 were polished with 3‐μm (3P), 35 with 3‐ and 1‐μm (1P), and 35 with 3‐, 1‐, and 0.5‐μm sized particles (05P). Five disks of each group were thermocycled for 20, 100, and 200 cycles. Sixty disks were thermocycled and kept in beverages (tea, wine, and coffee) after four cycles. Sixty disks were immersed in the beverages for 24 hours, a week, and a month. The coordinates L*a*b* were measured and the color differences were analyzed by ANOVA. The lightness, chroma, and hue differences were evaluated by repeated measures ANOVA. Comparisons were made with Tukey's test (α = 0.05). Results Similar behaviors were observed between 3P and 05P groups (1.53 and 1.95Δ E 00 ) ( P < .05). The NP group submitted to 200 cycles showed the biggest color differences (3.02) ( P = .003). The greatest color differences were observed in the NP group submitted to immersion in coffee (8.30) and wine (7.93) ( P < .05). Conclusions The polished surfaces were the least stained. Coffee and wine provided the greatest color changes, both for baths and immersions. Clinical Significance Polishing of provisional surfaces restorations made of bis‐acrylic resin is essential to minimize staining caused by aging and use of colorants, regardless of the particle size present in the polishing paste. The contact with coffee and red wine should be avoided, especially for clinical times greater than 1 week.