title: Effects of sports beverages and polishing systems on color stability of different resin composites.
abstract: BACKGROUND
  Consumption of certain acidic beverages may alter the physical and esthetic properties of resin composites.
  
  
  OBJECTIVE
  The aim of this study was to evaluate the effects of two sports beverages on color stability of two different types of resin composites polished with different composite polishing systems.
  
  
  METHODS
  A total of 96 disk-shaped specimens (diameter: 8-mm and thickness: 2-mm) were made from two different resin composites (Cavex Quadrant Universal-LC, and Clearfil-APX). All of the specimens were stored in distilled water for 24 h at 37°C. Color measurements of each specimen were performed using a colorimeter according to the CIEL*a*b* color scale at baseline and after seven days of immersion in two different sports beverages (Powerade and Buzzer).
  
  
  METHODS
  The data were evaluated using Kruskal Wallis and Mann-Whitney U tests.
  
  
  RESULTS
  Significant differences were found between the mean ΔE values of the groups after seven days of immersion (P < 0.05). The highest level of the mean color change was observed in the Clearfil APX specimens immersed in Powerade (ΔE = 3.5 ± 0.9). Control groups stored in distilled water for both composites exhibited small color changes (ΔE-Cavex-bur = 2.1 ± 1; ΔE-Clearfil APX-bur = 2.1 ± 0.4).
  
  
  CONCLUSIONS
  Sport beverages caused discoloration in the resin composites after seven days.
authors.affiliation: Department of Dental Treatment and Prosthetics, Kuşadası State Hospital, Kuşadası, Aydın, Turkey.
authors.forename: Ertan
authors.initials: E
authors.lastname: Taşkınsel
authors.affiliation: Department of Restorative Dentistry, Kocaeli University, Yuvacik/Basiskele, Kocaeli, Turkey.
authors.forename: Emre
authors.initials: E
authors.lastname: Ozel
authors.affiliation: Department of Restorative Dentistry, Hacettepe University, Sihhiye, Ankara, Turkey.
authors.forename: Elif
authors.initials: E
authors.lastname: Oztürk
keywords: Color stability; microhybrid; nanohybrid; polishing; resin composites