title: Influence of surface sealing on color stability and roughness of composite submitted to ultraviolet-accelerated aging.
abstract: OBJECTIVE
  In the present study, we evaluated the influence of surface sealing on color stability and surface roughness of a composite resin after accelerated artificial aging.
  
  
  METHODS
  Thirty-two specimens of a composite were prepared. After 24 h, the specimens were polished and divided into four groups (n = 8), according to the surface sealant used, including the control, which had no sealant application. Baseline color was measured according to the CIELab system using a reflection spectrophotometer. Surface roughness was determined using a profilometer with a cut-off of 0.25 mm. After these tests, specimens were aged for 252 h in an ultraviolet (UV)-accelerated aging chamber. Color stability was determined by difference between coordinates obtained before and after the aging procedure. Data of color change and roughness were evaluated by anova and Fisher's exact test (α = 0.05).
  
  
  RESULTS
  The results showed that the unsealed group had the highest color change compared to other groups (P = 0.0289), and there was no significant difference between groups sealed with surface sealant (P > 0.05). The artificial aging caused an increase in roughness values independent of the experimental group studied (P = 0.0015).
  
  
  CONCLUSIONS
  The sealed composites showed lower color change after UV aging, but all groups showed clinically-acceptable color change, and only liquid polish decreased roughness.
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, São Paulo, Brazil.
authors.forename: Anderson
authors.initials: A
authors.lastname: Catelan
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University, São Paulo, Brazil.
authors.forename: Thaís Yumi Umeda
authors.initials: TYU
authors.lastname: Suzuki
authors.affiliation: Private Practice, São Paulo, Brazil.
authors.forename: Francisco
authors.initials: F
authors.lastname: Becker
authors.affiliation: Department of Restorative Dentistry, Araçatuba School of Dentistry, São Paulo State University, São Paulo, Brazil.
authors.forename: André Luiz Fraga
authors.initials: ALF
authors.lastname: Briso
authors.affiliation: Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University, São Paulo, Brazil.
authors.forename: Paulo Henrique
authors.initials: PH
authors.lastname: Dos Santos
mesh_terms: D003116:Color; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D010895:Pit and Fissure Sealants / Q000528:radiation effects; D013499:Surface Properties; D014466:Ultraviolet Rays
chemical_list: D003188:Composite Resins; D010895:Pit and Fissure Sealants
keywords: accelerated artificial aging; color stability; composite resin; roughness; surface sealant