title: Dental bleaching with a 10% hydrogen peroxide product: a six-month clinical observation.
abstract: BACKGROUND
  The possibility of bleaching vital teeth with peroxide-based products considerably revolutionized esthetic dentistry.
  
  
  OBJECTIVE
  The aim of this clinical study was to evaluate tooth color change and dental sensitivity after exposure to preloaded film containing a 10% hydrogen peroxide whitening system (Opalescence Trθswhite Supreme).
  
  
  METHODS
  A total of 13 volunteers, aged 18 to 25 years, participated in this study. The patients used the whitening system once a day for 60 minutes during the 8-day study. For maxillary incisors and canines, the color change was visually evaluated with the Vita color scale before, immediately, and six months after the treatment. Tooth sensitivity was evaluated during the daily gel applications. All whitening applications were done in office and under the supervision of a dental professional.
  
  
  METHODS
  The results were analyzed using the Friedman Test (nonparametric repeated measures ANOVA) at a level of 5%, and Dunn's Multiple Comparison Test at the level of 5%.
  
  
  RESULTS
  It was verified that the original mean color values observed at the baseline analysis differed significantly from those observed immediately after bleaching, as well as from those seen in the analysis at six months ( P = 0.001). There was no significant difference between the mean color values observed in the immediate time and in the analysis at six months ( P = 0.474). No tooth sensitivity was observed in any patients.
  
  
  CONCLUSIONS
  It was concluded that the bleaching technique using the 10% hydrogen peroxide system was effective in a short period of time without tooth sensitivity during applications.
authors.affiliation: Department of Restorative Dentistry, Aracatuba Dental School, Univ Estadual Paulista, Aracatuba, São Paulo, Brazil.
authors.forename: Renato Herman
authors.initials: RH
authors.lastname: Sundfeld
authors.forename: Daniel
authors.initials: D
authors.lastname: Sundfeld Neto
authors.forename: Lucas Silveira
authors.initials: LS
authors.lastname: Machado
authors.forename: Fernanda Garcia
authors.initials: FG
authors.lastname: de Oliveira
authors.forename: Rodrigo Sversut
authors.initials: RS
authors.lastname: de Alexandre
authors.forename: Renato Mioto
authors.initials: RM
authors.lastname: Palo
authors.forename: Maria Lúcia M M
authors.initials: ML
authors.lastname: Sundefeld
mesh_terms: D000293:Adolescent; D000328:Adult; D003116:Color; D006801:Humans; D006861:Hydrogen Peroxide / Q000008:administration & dosage*; D014073:Tooth Bleaching; D055815:Young Adult
chemical_list: D006861:Hydrogen Peroxide