title: Effect of Energy Drinks on Discoloration of Silorane and Dimethacrylate-Based Composite Resins.
abstract: OBJECTIVE
  This study aimed to assess the effects of two energy drinks on color change (ΔE) of two methacrylate-based and a silorane-based composite resin after one week and one month.
  
  
  METHODS
  Thirty cubic samples were fabricated from Filtek P90, Filtek Z250 and Filtek Z350XT composite resins. All the specimens were stored in distilled water at 37°C for 24 hours. Baseline color values (L*a*b*) of each specimen were measured using a spectrophotometer according to the CIEL*a*b* color system. Ten randomly selected specimens from each composite were then immersed in the two energy drinks (Hype, Red Bull) and artificial saliva (control) for one week and one month. Color was re-assessed after each storage period and ΔE values were calculated. The data were analyzed using the Kruskal Wallis and Mann-Whitney U tests.
  
  
  RESULTS
  Filtek Z250 composite showed the highest ΔE irrespective of the solutions at both time points. After seven days and one month, the lowest ΔE values were observed in Filtek Z350XT and Filtek P90 composites immersed in artificial saliva, respectively. The ΔE values of Filtek Z250 and Z350XT composites induced by Red Bull and Hype energy drinks were not significantly different. Discoloration of Filtek P90 was higher in Red Bull energy drink at both time points.
  
  
  CONCLUSIONS
  Prolonged immersion time in all three solutions increased ΔE values of all composites. However, the ΔE values were within the clinically acceptable range (<3.3) at both time points.
authors.affiliation: Assistant Professor, Dental Materials Research Center, Department of Restorative and Esthetic Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran.
authors.forename: Ghazaleh
authors.initials: G
authors.lastname: Ahmadizenouz
authors.affiliation: Assistant Professor, Dental Materials Research Center, Department of Restorative and Esthetic Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran.
authors.forename: Behnaz
authors.initials: B
authors.lastname: Esmaeili
authors.affiliation: Dental Student, Student Research Committee, Babol University of Medical Sciences, Babol, Iran.
authors.forename: Zohreh
authors.initials: Z
authors.lastname: Ahangari
authors.affiliation: Assistant Professor, Department of Social Medicine and Health, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran.
authors.forename: Soraya
authors.initials: S
authors.lastname: Khafri
authors.affiliation: Dental Student, Student Research Committee, Babol University of Medical Sciences, Babol, Iran.
authors.forename: Aghil
authors.initials: A
authors.lastname: Rahmani
keywords: Color; Composite Resins; Energy Drinks; Silorane Composite Resin; Spectrophotometry