title: The effect of different drinks on the color stability of different restorative materials after one month.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effect of three different drinks on the color parameters of four different restorative materials.
  
  
  METHODS
  Three different composites (Filtek Ultimate Universal Restorative, Filtek Ultimate Flowable, and Filtek Silorane, 3M ESPE) and a polyacid-modified composite resin material (Dyract XP, Dentsply DeTrey GmbH) were evaluated. Eighty-four disc-shaped specimens of 8 mm in diameter and 2 mm in thickness were prepared (n = 21 each). Color coordinates (L*a*b*, ΔL*, Δa*, Δb*, and ΔE*) were measured using a VİTA Easyshade Compact (VİTA Zahnfabrik) after 24 hr of storage (baseline) and after 30 day of storage in three different beverages of black tea, Coca cola, or water (control) (n = 7). In each beverage, the specimens were stored three times a day, one hr each, for 30 day. The color changes (ΔE) were calculated and were analyzed by Kruskal-Wallis and Dunn multiple comparison test.
  
  
  RESULTS
  The color difference (ΔE*) of the resin materials ranged between 1.31 and 15.28 after 30 day of immersion in the staining solutions. Dyract XP in Coca cola (15.28 ± 2.61) and black tea (12.22 ± 2.73) showed the highest mean ΔE* value after 30 day, followed by Filtek Ultimate Universal Restorative (5.99 ± 1.25) and Filtek Ultimate Flowable (4.71 ± 1.40) in black tea (p < 0.05).
  
  
  CONCLUSIONS
  The compomers displayed unacceptable color changes at the end of 30 day in all beverages. Among resin composites, the silorane based composite exhibited relatively good color stability than the others. Filtek Ultimate Universal Restorative and Filtek Flowable showed similar color changes in all beverages.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of Kocaeli, Kocaeli, Turkey.
authors.forename: Neslihan
authors.initials: N
authors.lastname: Tekçe
authors.affiliation: Department of Conservative Dentistry, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
authors.forename: Safa
authors.initials: S
authors.lastname: Tuncer
authors.affiliation: Department of Conservative Dentistry, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Demirci
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of Kocaeli, Kocaeli, Turkey.
authors.forename: Merve Efe
authors.initials: ME
authors.lastname: Serim
authors.affiliation: Department of Biostatistics and Medical Informatics, University of Kocaeli, Kocaeli, Turkey.
authors.forename: Canan
authors.initials: C
authors.lastname: Baydemir
keywords: Color stability; Compomer; Drinks; Nanocomposite; Silorane