title: Intrinsic and extrinsic discoloration of dimethacrylate and silorane based composites.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the intrinsic and extrinsic color change of dimethacrylate and silorane-based composites.
  
  
  METHODS
  Five contemporary composites were included within the study (Filtek LS Low Shrink Posterior Restorative [SIL], Filtek SupremeXT [SPR], Filtek Z250 [Z25], Filtek P60 [P60], and Admira [ADM]). Twenty-five specimens (8-mm diameter, 1.5-mm thickness) were prepared for each composite. After baseline color measurements were taken, specimens were immersed in 4 staining solutions (red wine, coffee, cola, and tea) or distilled water (n=5). After a 24-h and 1-month immersion, the color values of each specimen were remeasured and the color change values (ΔE(ab)(*)) were calculated. Statistical analyses were evaluated by one-way ANOVA and Tukey HSD test.
  
  
  RESULTS
  Amongst the solutions, red wine had the highest ΔE(ab)(*) value in all the composite restoratives. After the final measurement, ADM exhibited the lowest discoloration, whereas SPR exhibited the highest color change. Additionally, the color change for SIL after 1 month in distilled water was higher than the clinically accepted cut-off of 3.3. This change was correlated with an increasing L value according to the multiple regression analysis.
  
  
  CONCLUSIONS
  All of the restorative materials used in this study were susceptible to staining by commonly consumed beverages drinks, especially red wine and coffee; however, in water, only SIL became whiter with time.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Akdeniz University, 07058 Antalya, Turkey. c.barutcugil@yahoo.com
authors.forename: Çağatay
authors.initials: Ç
authors.lastname: Barutcigil
authors.forename: Mehmet
authors.initials: M
authors.lastname: Yıldız
mesh_terms: D001628:Beverages; D003069:Coffee / Q000737:chemistry; D030221:Cola / Q000737:chemistry; D003116:Color; D003124:Colorimetry; D003188:Composite Resins / Q000737:chemistry*; D005505:Food Coloring Agents; D007101:Immersion; D008422:Materials Testing; D008689:Methacrylates; D012044:Regression Analysis; D012833:Siloxanes; D013662:Tea / Q000737:chemistry; D014920:Wine
chemical_list: D003069:Coffee; D003188:Composite Resins; D005505:Food Coloring Agents; D008689:Methacrylates; D012833:Siloxanes; D013662:Tea