title: Influence of different drinks on the colour stability of dental resin composites.
abstract: OBJECTIVE
  The objective of this study was to evaluate the discolouration effects of artificial saliva, granule lemon juice, coffee (without sugar), coca cola, sour cherry juice, fresh carrot juice and red wine on resin-based composite materials that are commonly used in restorative dentistry.
  
  
  METHODS
  Colour of four brands of resin composites (Filtek Z 250 (3M Espe), Filtek Supreme (3M Espe), Quadrant (Cavex), Charisma (Heraeus-Kulzer)) of A2 shade was measured after one day of immersion in eight different solutions. Colour measurements were obtained by using a XL-20 Trismus Colourimeter and colour differences (DeltaE) were estimated. For statistical evaluation, analysis of variance (ANOVA), Dunnett and Tukey tests were used at a significance level of 0.05.
  
  
  RESULTS
  For the four restorative materials tested, the lowest DeltaE values were observed in the artificial saliva, while DeltaE values were the highest in red wine group. When comparing the four different restorative materials, Filtek Supreme exhibited the least colour changes whereas Filtek Z250 was the least colour-stable.
  
  
  CONCLUSIONS
  Dental resin composites and drinking solutions were significant factors that may affect the colour stability. After immersion for one day, all materials showed visible colour changes. The red wine solution exhibited more staining than others in three groups. Filtek Supreme showed significantly the least colour change due to its nano particle sizes.
authors.affiliation: Gulhane Military Medical Academy, Dental Sciences Center, Department of Conservative Dentistry and Endodontics, Ankara, Turkey.
authors.forename: Fulya Toksoy
authors.initials: FT
authors.lastname: Topcu
authors.forename: Gunes
authors.initials: G
authors.lastname: Sahinkesen
authors.forename: Kivanc
authors.initials: K
authors.lastname: Yamanel
authors.forename: Ugur
authors.initials: U
authors.lastname: Erdemir
authors.forename: Elif Aybala
authors.initials: EA
authors.lastname: Oktay
authors.forename: Seyda
authors.initials: S
authors.lastname: Ersahan