title: Spectrophotometric evaluation of color alterations with a new dental bleaching product in patients wearing orthodontic appliances.
abstract: BACKGROUND
  Our objective was to assess the effectiveness of a new bleaching agent (8% hydrogen peroxide) used in patients wearing fixed orthodontic appliances.
  
  
  METHODS
  Six anterior maxillary teeth of 40 patients aged 18 to 40 years were assessed. The patients were divided into 2 groups (20 in each group): in group A, the patients used the bleaching agent during orthodontic treatment; in group B, the patients used the bleaching agent after orthodontic treatment. For each group, a record of the initial tooth shade was taken with a polyvinyl siloxane matrix and a spectrophotometer. The groups had bleaching treatments with an 8% hydrogen peroxide product (Opalescence Treswhite Ortho, Ultradent, Opal Orthodontics, South Jordan, Utah) for 10 days in 45-minute sessions. For group A, the treatment was performed 10 days before finishing orthodontic treatment; at the end of the treatment, a new tooth shade record was taken with the polyvinyl siloxane matrix and a spectrophotometer. The subjects in group B had the same bleaching protocol after their brackets were removed.
  
  
  RESULTS
  It was observed that, for the group without brackets, the color alteration ranged from 3 to 12 (mean, 8; median, 8.3); for the group with brackets, the range was between 4 and 13 (mean, 9; median, 8.5), indicating significant tooth bleaching in both groups with and without brackets (P >0.05).
  
  
  CONCLUSIONS
  Opalescence Treswhite Ortho was shown to be an efficient bleaching agent in patients wearing fixed orthodontic appliances.
authors: ejadad@gmail.com
authors: Enrique
authors: E
authors: Jadad
authors: Jaime
authors: J
authors: Montoya
authors: Gonzalo
authors: G
authors: Arana
authors: Luis Alfonso Arana
authors: LA
authors: Gordillo
authors: Renato Miotto
authors: RM
authors: Palo
authors: Alessandro D
authors: AD
authors: Loguercio
mesh_terms: D000293:Adolescent; D000328:Adult; D003481:Cuspid; D005260:Female; D006801:Humans; D006861:Hydrogen Peroxide / Q000008:administration & dosage / Q000494:pharmacology*; D007180:Incisor; D008297:Male; D016910:Orthodontic Brackets; D013053:Spectrophotometry; D018709:Statistics, Nonparametric; D013997:Time Factors; D014073:Tooth Bleaching / Q000379:methods*; D058205:Tooth Bleaching Agents / Q000008:administration & dosage / Q000494:pharmacology*; D055815:Young Adult
chemical_list: D058205:Tooth Bleaching Agents; D006861:Hydrogen Peroxide