title: Comparison of two low sensitivity whiteners.
abstract: OBJECTIVE
  To evaluate two commercially available doctor-supplied, patient-applied, bleaching systems for their ability to whiten the maxillary anterior teeth while at the same time not causing sensitivity.
  
  
  METHODS
  46 participants were randomly assigned to one of two groups: One group received Rembrandt Xtra-Comfort and the other group Nite White Excel 2Z. Bleaching stents were fabricated and the bleaching systems were used following manufacturers' instructions. Participants recorded tray use and any sensitivity on a daily basis. Participants bleached for 2 weeks followed by 2 weeks of no bleaching. Color was evaluated at the first, second and fourth week following the initial delivery of bleaching trays. Color change was measured using the Vita Classic Shade Guide arranged by value.
  
  
  RESULTS
  As a group, participants in the NW2Z group bleached for 302 days with a total of 48 days (16%) of sensitivity recorded. The Rembrandt Xtra Comfort group bleached for 313 total days with 97 days (31%) of sensitivity recorded. The difference in sensitivity between the two products proved to be statistically significant (Chi-square analysis, P < or = 0.0001). The median shade change for both products following 2 weeks of active treatment was six tabs. At the 4-week evaluation, the median shade change was 5.5 and 6.0 tabs respectively for Rembrandt and Nite White. There was no statistical difference between the products in respect to shade change.
authors.affiliation: Department of Oral Rehabilitation, School of Dentistry, Medical College of Georgia, Augusta, USA. rcallan@mail.mcg.edu
authors.forename: Richard S
authors.initials: RS
authors.lastname: Callan
authors.forename: William D
authors.initials: WD
authors.lastname: Browning
authors.forename: Mary C
authors.initials: MC
authors.lastname: Downey
authors.forename: Martha G
authors.initials: MG
authors.lastname: Brackett
mesh_terms: D000328:Adult; D000077463:Carbamide Peroxide; D003116:Color; D003807:Dentin Sensitivity / Q000145:classification / Q000517:prevention & control*; D004338:Drug Combinations; D005500:Follow-Up Studies; D005881:Gingiva / Q000187:drug effects / Q000473:pathology; D006801:Humans; D016877:Oxidants / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D010545:Peroxides / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D013997:Time Factors; D014070:Tooth / Q000187:drug effects / Q000473:pathology; D014073:Tooth Bleaching / Q000295:instrumentation / Q000379:methods*; D014508:Urea / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives / Q000627:therapeutic use
chemical_list: D004338:Drug Combinations; D016877:Oxidants; D010545:Peroxides; C529987:nite white excel 2Z; C529988:rembrant xtra comfort; D000077463:Carbamide Peroxide; D014508:Urea