Influence of light curing units and fluoride mouthrinse on morphological surface and color stability of a nanofilled composite resin

• Published in: Microscopy research and technique Vol. 77; no. 11; pp. 941 - 946
• Main Authors: De Oliveira, Ana Luísa Botta Martins, Botta, Ana Carolina, Campos, Juliana Álvares Duarte Bonini, Garcia, Patrícia Petromilli Nordi Sasso
• Format: Journal Article
• Language: English
• Published: United States Blackwell Publishing Ltd 01.11.2014; Wiley Subscription Services, Inc
• Subjects: Color; Colors (materials); composite resins; Composite Resins - chemistry; Composite Resins - metabolism; Composite Resins - radiation effects; Curing Lights, Dental; dental technology; Esthetics, Dental; Fluorides; Fluorides - pharmacology; fluorine; Humans; Immersion; Light sources; Media; Microscopy, Electron, Scanning; Morphology; Mouthwashes; Nanocomposites - chemistry; Nanocomposites - therapeutic use; Nanocomposites - ultrastructure; Polymers; Resins; SEM; Surface Properties; dental technology; SEM; composite resins; color; fluorine
• ISSN: 1059-910X; 1097-0029
• DOI: 10.1002/jemt.22421

ABSTRACT Composite resin is a dental material susceptible to color change over time which limits the longevity of restorations made with this material. The influence of light curing units and different fluoride mouthrinses on superficial morphology and color stability of a nanofilled composite resin was evaluated. Specimens (N = 150) were prepared and polished. The experimental groups were divided according to the type of light source (halogen and LED) and immersion media (artificial saliva, 0.05% sodium fluoride solution‐manipulated, Fluordent Reach, Oral B, Fluorgard). Specimens remained in artificial saliva for 24‐h baseline. For 60 days, they were immersed in solutions for 1 min. Color readout was taken at baseline and after 60 days of immersion. Surface morphology was analyzed by Scanning Electron Microscopy (SEM) after 60 days of immersion. Color change data were submitted to two‐way Analysis of Variance and Tukey tests (α = 0.05). Surface morphology was qualitatively analyzed. The factor light source presented no significant variability (P = 0.281), the immersion media, significant variability (P < 0.001) and interaction between factors, no significant variability (P = 0.050). According to SEM observations, no difference was noted in the surface of the specimens polymerized by different light sources, irrespective of the immersion medium. It was concluded that the light source did not influence the color stability of composite, irrespective of the immersion media, and among the fluoride solutions analyzed, Fluorgard was the one that promoted the greatest color change, however, this was not clinically perceptible. The immersion media did not influence the morphology of the studied resin. Microsc. Res. Tech. 77:941–946, 2014. © 2014 Wiley Periodicals, Inc.