title: Correlation between three-dimentional surface topography and color stability of different nanofilled composites.
abstract: OBJECTIVE
  The aim of this study was to evaluate the 3-dimensional (3D) surface topography and color stability of four different resin composites after immersion in different soft-beverages.
  
  
  METHODS
  One hundred sixty disk-shaped specimens (diameter: 10 mm, and thickness: 2 mm) were made from four different resin composites (i.e., Filtek Z550, Tetric N-Ceram, Clearfil Majesty Esthetic, and Cavex Quadrant Universal LC). Each specimen was cured under mylar strips for 20 sec for both top and bottom surfaces. All of the specimens were stored in distilled water for 24 h at 37°C. Surface measurements were carried out using a noncontact 3D-optical-profilometer in terms of surface topography (Ra values). Color measurements of each specimen were performed with Vita Easy Shade system. All the measurements were performed at baseline and after 30 days of immersion in the selected soft-beverages (Redbull, Coca-Cola and Dimes-Lemonade). Control groups were stored in distilled water during the study. Ra values and color changes (ΔE values) of the groups were recorded. The data were statistically analyzed using a one way ANOVA and Tukey's post-hoc tests (SPSS 18.0).
  
  
  RESULTS
  The tested soft-beverages in the present study caused color changes at a 30-day evaluation period for the tested resin composites (p < 0.05). However, 3D surface topography of resin composites was not influenced by the tested soft-beverages (p > 0.05). There was no significant interaction between the composite and beverage type on the Ra values of the resin composites (p > 0.05).
  
  
  CONCLUSIONS
  No correlation was found between color stability and 3D surface topography of the resin composites. Color stability of resin composites may be affected by soft beverages.
authors.affiliation: Department of Restorative Dentistry, Hacettepe University, Faculty of Dentistry, Sihhiye, Ankara, Turkey.
authors.forename: Elif
authors.initials: E
authors.lastname: Öztürk
authors.affiliation: Department of Restorative Dentistry, Kocaeli University, Faculty of Dentistry, Yuvacik/Basiskele, Kocaeli, Turkey.
authors.forename: Gizem
authors.initials: G
authors.lastname: Güder
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D002253:Carbonated Beverages; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D004781:Environmental Exposure; D049329:Nanostructures / Q000737:chemistry*; D011140:Polyurethanes / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes
keywords: 3D-Surface topography; color stability; optical profilometry; resin composites