title: In vitro color and roughness stability of different temporary restorative materials.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effects of staining solutions on the color stability and roughness of different provisional resin material.
  
  
  METHODS
  Three different materials were tested (two polymethylmethacrylate and one bis-acryl composite resins) in cola and coffee and for 1 and 4 weeks. 240 specimens were used - half of them polished and other half not. Color measurements were made before and after immersions using CIE L*a*b*. Surface roughness was measured using profilometer. Data was analyzed by ANOVA and Tukey HSD multiple comparison tests.
  
  
  RESULTS
  The highest ΔE values were observed in the coffee. Unpolished and polished bis-acryl resin showed the highest ΔE values (p<0.00) in both intervals. The i-TEMP had the lowest or one of the least color changes. The time factor had influence on the color stability of provisional materials (p<0.01). The highest Ra values of polished specimens were observed in the cola; i-TEMP exposed the best result (p<0.00). The Pearson Correlation test showed a strong correlation between ΔE and Ra in provisional restorative materials in coffee and weak-moderate correlation in cola.
  
  
  CONCLUSIONS
  The higher color stability of polished and unpolished specimens was shown by polymethylmethacrylate than bis-acryl resins. All polished specimens shown better color stability properties than unpolished except for the hot polymerization provisional materials (i-CAB). Polished polymethylmethacrylate showed better results of average roughness in comparison with bis-acryl resin. Cold-polymerization polymethylmethacrylate had better results of color and roughness stability than hot-polymerization polymethylmethacrylate.
authors.forename: Egle
authors.initials: E
authors.lastname: Mickeviciute
authors.affiliation: Clinical Department of Dental and Maxillar Orthopaedics, Sukileliu 51, LT- 50106, Kaunas, Lithuania. eglesidabrine@gmail.com.
authors.forename: Egle
authors.initials: E
authors.lastname: Ivanauskiene
authors.forename: Viktorija
authors.initials: V
authors.lastname: Noreikiene
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D002253:Carbonated Beverages; D003069:Coffee; D003116:Color; D003124:Colorimetry; D003188:Composite Resins / Q000737:chemistry*; D003775:Dental Polishing; D003794:Dental Restoration, Temporary; D008422:Materials Testing / Q000379:methods*; D058105:Polymerization; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D003069:Coffee; D003188:Composite Resins; D019904:Polymethyl Methacrylate