title: Color stability of microfilled, microhybrid and nanocomposite resins--an in vitro study.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effect of two beverages-Tea and Pepsi on the color stability of three different composite resins after a period of 7 and 30 days.
  
  
  METHODS
  Color stability of a microfilled, microhybrid and nanocomposite was evaluated after storage in Tea, a carbonated drink or Distilled Water for 7 and 30 days. Color measurement was done using reflectance spectrophotometer based on the CIE L*a*b* color scale. Mean values of the different groups were compared using three-way analysis of variance and multiple comparisons of the mean values were done using Tukey-Kramer test with 0.05 as significance level.
  
  
  RESULTS
  All tested resin composites showed color change after a period of 7 and 30 days. The color change exhibited by all three groups was significantly different for all three beverages studied, at both time periods (p<0.05). Amongst the resin composites studied microhybrid composite was found to be more color stable. The microfilled composite discolored most in Distilled Water and Pepsi at the 7th and 30th day. The nanocomposite discolored most in Tea at 7th and 30th day.
  
  
  CONCLUSIONS
  All efforts should be made to minimize discoloration of composite restorations by adopting excellent polishing techniques. Patients should also be educated on the possibility of the restoration to undergo staining under the influence of beverages.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Saveetha Dental College and Hospitals, Saveetha University, Chennai, Tamil Nadu, India.
authors.forename: Iffat
authors.initials: I
authors.lastname: Nasim
authors.forename: Prasanna
authors.initials: P
authors.lastname: Neelakantan
authors.forename: R
authors.initials: R
authors.lastname: Sujeer
authors.forename: C V
authors.initials: CV
authors.lastname: Subbarao
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D001628:Beverages / Q000009:adverse effects*; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003793:Dental Restoration, Permanent; D011140:Polyurethanes / Q000737:chemistry; D017797:Prosthesis Coloring; D013662:Tea / Q000009:adverse effects / Q000737:chemistry; D013997:Time Factors; D014075:Tooth Discoloration
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; C513708:Heliomolar; D011140:Polyurethanes; C420128:Spectrum composite resin; D013662:Tea; C533204:filtek Z350