title: Effect of liquid polishing materials on the stainability of bis-acryl interim restorative material in vitro.
abstract: BACKGROUND
  The discoloration of interim restorations may negatively affect a patient's perception of treatment.
  
  
  OBJECTIVE
  The purpose of this study was to investigate the effect of liquid polishing materials on the color stability of bis-acryl interim restorative material.
  
  
  METHODS
  One hundred twenty specimens (10×2 mm) of a bis-acryl interim restorative material were divided into 3 groups. Group CO (control) was not subjected to any liquid polishing material. Groups GC and BC were polished with 2 liquid polishing materials. The specimens were then divided into 4 subgroups (n=10) and stored for 24 hours at 37°C in different staining solutions: coffee, coffee with sugar, cola, and distilled water. The color of the specimens was measured at baseline and after immersion with a spectrophotometer by using the CIE L*a*b* system, and color changes (ΔE) were calculated. The means of color change for each specimen were analyzed by 2-way and 1-way ANOVA tests. Post hoc comparisons were made with the Tukey HSD and Tamhane T2 tests.
  
  
  RESULTS
  The application of liquid polishing materials significantly decreased the staining of autopolymerized bis-acryl interim restorative material (P<.01). Coffee with sugar resulted in higher ΔE values than coffee without sugar or cola.
  
  
  CONCLUSIONS
  The use of liquid polishing materials significantly decreased staining when compared with bis-acryl specimens without liquid polish. The presence of sugar in coffee increased color change compared with coffee without sugar for all groups evaluated.
authors: Assistant Professor, Department of Prosthodontics, School of Dentistry, Istanbul Medipol University, Istanbul, Turkey. Electronic address: ucakan@medipol.edu.tr.
authors: Umut
authors: U
authors: Cakan
authors: Assistant Professor, Department of Prosthodontics, School of Dentistry, Istanbul Medipol University, Istanbul, Turkey.
authors: Haluk Baris
authors: HB
authors: Kara
mesh_terms: D000179:Acrylates / Q000737:chemistry*; D002253:Carbonated Beverages; D003069:Coffee; D003116:Color; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing / Q000379:methods*; D003794:Dental Restoration, Temporary; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D019279:Resin Cements / Q000737:chemistry; D012996:Solutions / Q000737:chemistry*; D013053:Spectrophotometry; D013395:Sucrose / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D000179:Acrylates; C481141:BisCover; D003069:Coffee; D003764:Dental Materials; D019279:Resin Cements; D012996:Solutions; D014867:Water; D013395:Sucrose