title: Bond failure rates of two self-ligating brackets: a randomised clinical trial.
abstract: OBJECTIVE
  To evaluate the bond failure rates of two self-ligating appliance systems bonded with a self-etching primer.
  
  
  METHODS
  Forty patients were randomly assigned to either Group SC (SmartClip, 3M Unitek, Monrovia, CA, USA) or Group IR (In-Ovation R, GAC International, Bohemia, NY, USA) appliance groups. Seven hundred and sixty six brackets were bonded with Transbond Plus Self-Etching Primer and Transbond Plus Color Change Adhesive according to the manufacturer's instructions. Over a 12-month period, the survival rates of the brackets were estimated with the Kaplan-Meier analysis. The survival distributions for the appliance systems, dental arch and position in the dental arch were compared with the log-rank test.
  
  
  RESULTS
  The bond failure rate for SC was significantly lower than IR (p = 0.022). There were no differences in failure rates between either the maxillary and mandibular arches or between the anterior and posterior brackets.
  
  
  CONCLUSIONS
  SC provided a more reliable bond than IR over the 12-month observation period, however, both brackets had clinically acceptable bond failure rates.
authors.affiliation: lukechapmandds@yahoo.com
authors.forename: J Luke
authors.initials: JL
authors.lastname: Chapman
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D003724:Dental Arch / Q000473:pathology; D001840:Dental Bonding; D004868:Equipment Failure; D006801:Humans; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D008963:Molar / Q000473:pathology; D009532:Nickel / Q000737:chemistry; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D016019:Survival Analysis; D013997:Time Factors; D014025:Titanium / Q000737:chemistry
chemical_list: D003722:Dental Alloys; D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C040654:titanium nickelide; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate; D009532:Nickel; D014025:Titanium