title: Influence of coffee and red wine on tooth color during and after bleaching.
abstract: OBJECTIVE
  The aim of this study was to evaluate the influence of coffee and red wine staining on tooth color during and after bleaching.
  
  
  METHODS
  Blocks obtained from human molars were divided into 11 groups (n = 5) in accordance with the bleaching treatment-peroxide carbamide 10%, 15% or 20%-and in accordance with the stain therapy-coffee, wine or without staining (control). Color change analysis was performed by photo-reflectance using a spectrophotometer, during (3-times/week) and after (7, 15 and 30 days) the bleaching treatment. During the experiment, the samples were stored in artificial saliva. The results were submitted to statistical analysis with the Dunnet and Tukey tests (p < 0.05).
  
  
  RESULTS
  The concentrations of carbamide peroxide (10%, 15% and 20%) did not differ significantly from the control group during bleaching (up to the 22nd day), with (Tukey, p > 0.05) or without storage in pigment solution. After the bleaching, there were statistically significant differences between the groups treated with coffee (30th day) and wine (7th and 30th days) relative to the control, which was treated with whitening agents.
  
  
  CONCLUSIONS
  During bleaching, remineralization of the enamel with artificial saliva and the subsequent bleaching session were effective in preventing enamel staining. After the whitening procedures, both stain therapies-coffee and wine-caused enamel color changes; however, the wine led to greater staining than did coffee.
authors: Clinical Practice , São Paulo, SP , Brazil.
authors: Gabriel
authors: G
authors: Côrtes
authors: Núbia Pavesi
authors: NP
authors: Pini
authors: Débora Alves Nunes Leite
authors: DA
authors: Lima
authors: Priscila Christiane Susy
authors: PC
authors: Liporoni
authors: Egberto
authors: E
authors: Munin
authors: Gláucia Maria Bovi
authors: GM
authors: Ambrosano
authors: Flávio Henrique Baggio
authors: FH
authors: Aguiar
authors: José Roberto
authors: JR
authors: Lovadino
mesh_terms: D003069:Coffee; D003116:Color; D006801:Humans; D014073:Tooth Bleaching; D058205:Tooth Bleaching Agents / Q000627:therapeutic use*; D014920:Wine
chemical_list: D003069:Coffee; D058205:Tooth Bleaching Agents