title: Randomized clinical trial of orthodontic treatment efficiency with self-ligating and conventional fixed orthodontic appliances.
abstract: BACKGROUND
  Our objective was to test the hypotheses that treatment with 2 fixed orthodontic appliances (SmartClip and Victory; 3M Unitek, Monrovia, Calif) would result in no difference in (1) the duration of orthodontic treatment or (2) the number of visits required.
  
  
  METHODS
  Sixty-six consecutive patients were randomly allocated to treatment with a self-ligating bracket system (SmartClip) or a conventional appliance (Victory). The duration of treatment and the number of visits required in addition to the initial and final peer assessment rating (PAR) scores were recorded. The number of teeth extracted during treatment and the frequency of mechanical eruption of canines were also noted. Analyses of covariance were used to assess the influence of bracket type on treatment durations, visits required, and percentage PAR score reductions.
  
  
  RESULTS
  Fifty-four (81.8%) participants completed the study. The duration of treatment was 3 months greater in the group treated with SmartClip. However, bracket type had no statistical influence on treatment duration (P = 0.076), total visits required (P = 0.184), or percentage PAR score reduction (P = 0.255).
  
  
  CONCLUSIONS
  Neither hypothesis could be rejected. Bracket type did not influence the duration of treatment or the number of visits required. The percentages of PAR score reductions were also unaffected by the choice of appliance.
authors.affiliation: Department of Orthodontics, Royal London Dental Institute, United Kingdom. padhraigfleming@hotmail.com
authors.forename: Padhraig S
authors.initials: PS
authors.lastname: Fleming
authors.forename: Andrew T
authors.initials: AT
authors.lastname: DiBiase
authors.forename: Robert T
authors.initials: RT
authors.lastname: Lee
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy*; D009819:Office Visits / Q000706:statistics & numerical data; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D009971:Orthodontics, Corrective / Q000295:instrumentation*; D018024:Peer Review, Health Care; D011446:Prospective Studies; D013997:Time Factors; D055815:Young Adult