title: Changes on the color parameters of air-abraded resin composite exposed to different colored beverages.
abstract: OBJECTIVE
  To evaluate the effect of prophylaxis using sodium bicarbonate and colored beverages on the color parameters of a resin composite.
  
  
  METHODS
  Eighty specimens (Z350-3M ESPE) were randomly allocated into eight groups (n = 10), according to the combination of staining solution (artificial saliva, cola, red wine, or coffee) and air-powder abrasion with sodium bicarbonate (either performed or not performed). Specimens were immersed in the staining solution for 48 h (two 24-h cycles). Color evaluation was based on the CIELab system. Two measurements were carried out using a spectrophotometer (Commission Internationale de L'Eclairage L* a* b* system) before and after the immersion period. Final measurement data were analyzed by two-way anova/Tukey's test, and comparisons were made between initial and final measurements by anova/Dunnett's test, with a 5% significance level.
  
  
  RESULTS
  Most comparisons between initial and final measurements were statistically significant. Red wine and coffee significantly affected the color parameters (L*, b*, and ΔE). However, only coffee significantly increased a* values. When compared with untreated surfaces, air-powder abrasion resulted in alterations of b* and a* parameters, but did not affect L* and ΔE.
  
  
  CONCLUSIONS
  Both colored beverage solutions and air-powder abrasion can affect the color of composite resin restorations.
authors.affiliation: Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil Department of Clinical Dentistry, Federal University of Bahia, Salvador, Bahia, Brazil Department of Oral Rehabilitation, School of Medicine and Public Health of Bahia, Salvador, Bahia, Brazil.
authors.forename: Livia Aguilera
authors.initials: LA
authors.lastname: Gaglianone
authors.forename: Joana Dourado
authors.initials: JD
authors.lastname: Martins
authors.forename: Thaís Régis Aranha
authors.initials: TR
authors.lastname: Rossi
authors.forename: Letícia Oliveira
authors.initials: LO
authors.lastname: Saraiva
authors.forename: Andrea Nóbrega
authors.initials: AN
authors.lastname: Cavalcanti
authors.forename: Paula
authors.initials: P
authors.lastname: Mathias
mesh_terms: D020906:Air Abrasion, Dental / Q000379:methods*; D001628:Beverages; D002253:Carbonated Beverages; D003069:Coffee / Q000737:chemistry; D003116:Color; D003124:Colorimetry / Q000379:methods; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003777:Dental Prophylaxis / Q000379:methods; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D012464:Saliva, Artificial / Q000737:chemistry; D017693:Sodium Bicarbonate / Q000737:chemistry; D013053:Spectrophotometry / Q000295:instrumentation; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014920:Wine
chemical_list: D003069:Coffee; D003188:Composite Resins; D003764:Dental Materials; D012464:Saliva, Artificial; C533204:filtek Z350; D017693:Sodium Bicarbonate
keywords: air abrasion; beverage; composite resin; sodium bicarbonate; staining