title: Assessment of efficacy and post-bleaching sensitivity of home bleaching using 10% carbamide peroxide in extended and non-extended bleaching trays.
abstract: OBJECTIVE
  This study aimed to compare the effect of extended margin and conventional bleaching trays on tooth bleaching and tooth sensitivity. METHOD AND METHODS: Twenty subjects (18-56 years) were investigated in a split arch design clinical study that was conducted in a general dental practice. Each subject received a custom made bleaching tray and 10% carbamide peroxide gel. The bleaching trays had the borders extended 5 mm beyond the gingival margins on the right side and finished just at the gingival margin on the left side. Shade change and tooth sensitivity were the primary outcomes studied and analysed in this study. The shade of the six upper and lower anterior teeth was assessed using a value-ordered shade guide before, one week and two weeks after treatment. Sensitivity was self-assessed using a visual analogue scale (VAS) at the end of the first and second weeks of the study.
  
  
  RESULTS
  At the end of week two, the mean shade change was 5.01 (± 3.37) and 5.10 (± 3.36) for teeth covered by extended and non-extended tray design, respectively. The mean VAS sensitivity scores for teeth covered by extended and non-extended tray design were 0.96 (± 1.39) and 0.66 (± 0.96), respectively. There was no significant statistical difference between the two designs at any assessment point with regard to shade change and sensitivity (p >0.05).
  
  
  CONCLUSIONS
  It can be concluded that an extended tray design confers no superior effect in terms of the whitening outcome achieved or in reducing levels of sensitivity. Thus, both tray designs can be used depending on a dentist's personal preference.
authors.affiliation: Rossendale Dental Health Centre, East Lancashire, UK.
authors.forename: S
authors.initials: S
authors.lastname: Morgan
authors.affiliation: Restorative Dentistry Department, School of Dentistry, University of Leeds, UK.
authors.forename: A A
authors.initials: AA
authors.lastname: Jum'ah
authors.affiliation: Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, 310 Great King Street, PO Box 647, Dunedin, 9054, New Zealand.
authors.forename: P
authors.initials: P
authors.lastname: Brunton
mesh_terms: D000293:Adolescent; D000328:Adult; D000077463:Carbamide Peroxide; D003807:Dentin Sensitivity / Q000209:etiology*; D005260:Female; D006699:Home Care Services; D006801:Humans; D008297:Male; D008875:Middle Aged; D010545:Peroxides / Q000009:adverse effects / Q000627:therapeutic use*; D014073:Tooth Bleaching / Q000009:adverse effects / Q000379:methods*; D058205:Tooth Bleaching Agents / Q000009:adverse effects / Q000627:therapeutic use*; D016896:Treatment Outcome; D014508:Urea / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use; D055815:Young Adult
chemical_list: D010545:Peroxides; D058205:Tooth Bleaching Agents; D000077463:Carbamide Peroxide; D014508:Urea