title: Color Stability of Composites After Short-term Oral Simulation: Anin vitroStudy.
abstract: BACKGROUND
  Although most of the studies investigated color stability of different restorative materials, evaluation of color stability of composites after immersion in multiple beverages in the same day by anin vitrooral simulation study is unclear.
  
  
  OBJECTIVE
  To assess color change of different restorative materials at the end of days 1, 14, and 30 of immersion in multiple liquid types to mimic the oral environmentin vitro.
  
  
  METHODS
  Ten disc-shaped specimens were made from each of four different resin composites (Filtek Z250, Voco x-tra base, Beautifil Flow Plus, Beautifil II). Baseline color value of each sample was measured using a spectrophotometer. Each composite was respectively immersed in coffee, an orange/pomegranate juice mixture, black tea, and a mouth rinse on the same day to mimic daily liquid consumption of individuals. Color measurements were taken after 1, 14, and 30 days by spectrophotometer and color change values were calculated. Statistical analyses were executed by one-way ANOVA/Tukey HSD and repeated-measures ANOVA.
  
  
  RESULTS
  All materials showed significant color change after 1, 14, and 30 days (P< 0.01) of immersion in liquids, with the lowest color alteration observed at the 1stday and the highest observed after the 30thday. Among the materials tested, at each time point (1, 14, and 30 days), the lowest color alteration was detected in Filtek Z250 and the highest color alteration was detected in Beautifil II.
  
  
  CONCLUSIONS
  Color alteration of composite resins is affected by composite type and storage time. With the exception of 1 day of storage, color changes of all materials were substantial and clinically unacceptable.
authors.affiliation: Department of Pedodontics, Faculty of Dentistry, İstanbul Aydın University, İstanbul,Turkey.
authors.forename: Didem Öner
authors.initials: DÖ
authors.lastname: Özdaş
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, İstanbul Aydın University, İstanbul, Turkey.
authors.forename: Mağrur
authors.initials: M
authors.lastname: Kazak
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Trakya University, Edirne, Turkey.
authors.forename: Aylin
authors.initials: A
authors.lastname: Çilingir
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, İstanbul Aydın University, İstanbul,Turkey.
authors.forename: Meryem Gülce
authors.initials: MG
authors.lastname: Subaşı
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, İstanbul University, İstanbul,Turkey.
authors.forename: Murat
authors.initials: M
authors.lastname: Tiryaki
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, İstanbul Kemerburgaz University, İstanbul, Turkey.
authors.forename: Şölen
authors.initials: Ş
authors.lastname: Günal
keywords: Beverage type; Color alteration; Color measurement; Composite resin; Oral simulation; Storage time