title: Bond failure with a no-mix adhesive system.
abstract: OBJECTIVE
  To determine the bond failure pattern and time to first bond failure at an orthodontic clinic.
  
  
  METHODS
  The study included 63 subjects meeting the study criteria. A total of 1074 brackets (Roth prescription 0.022 slot) were bonded to incisors, canines, and premolars using a no-mix adhesive (Unite, 3M Unitek). The survival and failure rates of the brackets were evaluated by tooth position in the dental arch, sagittal occlusal relationship, and gender of the patients. Overall bracket survival rates were estimated using the Kaplan-Meier test.
  
  
  RESULTS
  The total percentage of bond failure was 17.87%. The mean survival time for the sample was 235 days (SE = 32.27 days). Significantly higher failure rates were observed for posterior than anterior teeth (P < .05) and in the Class II division 2 malocclusion group than other malocclusion groups (P < .05). No difference was observed between dental arches or genders. However, in terms of survival time, the difference was marginally significant for gender (P = .051)
  
  
  CONCLUSIONS
  For 1074 brackets bonded with a no-mix adhesive system in 63 patients, the mean time until first bracket failure was 235 days. The overall failure rate of brackets was 17.87%.
authors.affiliation: Department of Dental Surgery, The Aga Khan University Hospital, Karachi, Pakistan. aneel.bherwani@aku.edu
authors.forename: Aneel
authors.initials: A
authors.lastname: Bherwani
authors.forename: Mubassar
authors.initials: M
authors.lastname: Fida
authors.forename: Iqbal
authors.initials: I
authors.lastname: Azam
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000293:Adolescent; D001641:Bicuspid / Q000473:pathology; D003481:Cuspid / Q000473:pathology; D003724:Dental Arch / Q000473:pathology; D001840:Dental Bonding; D004868:Equipment Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000473:pathology; D008137:Longitudinal Studies; D008297:Male; D008310:Malocclusion / Q000145:classification; D008312:Malocclusion, Angle Class II / Q000473:pathology; D008334:Mandible / Q000473:pathology; D008422:Materials Testing; D008437:Maxilla / Q000473:pathology; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry*; D012737:Sex Factors; D016019:Survival Analysis; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D019279:Resin Cements; C045638:Unite dental cement