title: Effects of mouth rinses on color stability of resin composites.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effects of 3 commercially available mouth rinses on the color stability of 4 different resin-based composite restorative materials.
  
  
  METHODS
  Forty disc-shaped specimens (10x2 mm) were prepared from each of the following materials: A nanofill composite Filtek Supreme XT (3M/Espe, St. Paul, MN, USA); a packable low-shrinkage composite, AeliteLS Packable (BISCO, Inc, Shaumburg, IL, USA); nanoceramic composite resin Ceram-X (Dentsply, Konstanz, Germany); a microhybrid composite, and Aelite All-Purpose Body (BISCO). The specimens were then incubated in distilled water at 37 degrees C for 24 hours. The baseline color values (L*, a*, b*) of each specimen were measured with a colorimeter according to the CIELAB color scale. After baseline color measurements, 10 randomly selected specimens from each group were immersed in 1 of the 3 mouth rinses and distilled water as control. The specimens were stored in 20 mL of each mouth rinse (Oral B Alcohol-free, Listerine Tooth Defense Anti-cavity Fluoride Rinse and Klorhex) for 12 hours. After immersion, the color values of all specimens were remeasured, and the color change value DeltaE*ab was calculated. Data were analyzed using a 2-way analysis of variance at a significance level of .05.
  
  
  RESULTS
  All specimens displayed color changes after immersion, and there was a statistically significant difference among restorative materials and mouth rinses (P<.05); however, the change was not visually perceptible (DeltaE*ab<3.3). The interaction between the effect of mouth rinses and type of restorative materials was not statistically significant (P>.05).
  
  
  CONCLUSIONS
  It may be concluded that although visually nonperceptible, all resin restorative materials tested showed a color difference after immersion in different mouth rinses.
authors.affiliation: Instructor, Baskent University, School of Dentistry, Department of Conservative Dentistry, Ankara, Turkey.
authors.forename: Cigdem
authors.initials: C
authors.lastname: Celik
authors.forename: Bulem
authors.initials: B
authors.lastname: Yuzugullu
authors.forename: Selim
authors.initials: S
authors.lastname: Erkut
authors.forename: Kıvanc
authors.initials: K
authors.lastname: Yamanel