title: The effect of drinks on color stability and surface roughness of nanocomposites.
abstract: OBJECTIVE
  The aim was to evaluate the color and surface roughness of nanoparticle (C1) and nanohybrid (C2) composites after immersion in distilled water, acai juice, grape juice and red wine and repolishing.
  
  
  METHODS
  After recording the initial surface roughness and color, the specimens were divided into four groups according to the storage solution. The specimens were reassessed after immersion for 1, 2, 4, 8, and 12 weeks and after repolishing.
  
  
  RESULTS
  The results showed that after 2 weeks, there were statistically significant changes in color of both resins in all groups, with the exception of the specimens stored in distilled water (P > 0.05). Only 12 weeks of immersion in red wine changed the roughness of composite C1 (P = 0.009).
  
  
  CONCLUSIONS
  Red wine produced the greatest color change in nanocomposites, followed by grape juice. Acai juice made the color unacceptable clinically only after 12 weeks. Repolishing reduced the color change in all groups.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Paraíba, João Pessoa, PB, Brazil.
authors.forename: Maria Luísa de Alencar E Silva
authors.initials: MLAES
authors.lastname: Leite
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Paraíba, João Pessoa, PB, Brazil.
authors.forename: Fábia Danielle Sales da Cunha Medeiros E
authors.initials: FDSDCME
authors.lastname: Silva
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Paraíba, João Pessoa, PB, Brazil.
authors.forename: Sônia Saeger
authors.initials: SS
authors.lastname: Meireles
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Paraíba, João Pessoa, PB, Brazil.
authors.forename: Rosângela Marques
authors.initials: RM
authors.lastname: Duarte
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Paraíba, João Pessoa, PB, Brazil.
authors.forename: Ana Karina Maciel
authors.initials: AKM
authors.lastname: Andrade
keywords: Color stability; drinks; nanocomposite; surface roughness