title: A prospective randomized clinical trial to compare pre-coated and non-pre-coated brackets.
abstract: OBJECTIVE
  To compare the clinical failure rate of pre-coated brackets and brackets bonded using Transbond XT light cure system
  
  
  METHODS
  (i) The clinical time required for bond up of upper and lower arches of both systems, (ii) bond failure rate for the first 6 months.
  
  
  METHODS
  Single centre randomized controlled clinical study. Thirty-three patients were bonded using a split mouth technique: randomly allocating the pre-coated brackets to upper left and lower right quadrants, and non-pre-coated brackets to the other quadrants.
  
  
  METHODS
  Hospital Orthodontic Department, Basingstoke, Hampshire, UK.
  
  
  METHODS
  Orthodontic patients requiring fixed appliances.
  
  
  METHODS
  The site and time to bond failure was recorded for each bracket that failed over the first 6 months. The time required to bond upper and lower arches was measured using a stopwatch for each patient.
  
  
  RESULTS
  t-Test for the difference of mean time needed to apply both groups of brackets, no significant difference (P > 0.2) was found. A chi-squared test for the difference in bracket failure between pre-coated (8.06%) and non-pre-coated (7.37%) showed no significant difference in bracket failure (P > 0.2).
  
  
  CONCLUSIONS
  The clinical failure rate of pre-coated brackets is not significantly lower than conventional non-pre-coated brackets.
authors.affiliation: Department of Orthodontics, North Hampshire Hospital, Basingstoke, UK. mwong@nhh.u-net.com
authors.forename: M
authors.initials: M
authors.lastname: Wong
authors.forename: S
authors.initials: S
authors.lastname: Power
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D016009:Chi-Square Distribution; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D001840:Dental Bonding; D004868:Equipment Failure; D006801:Humans; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D011446:Prospective Studies; D019279:Resin Cements / Q000737:chemistry; D016037:Single-Blind Method; D013499:Surface Properties; D013997:Time Factors
chemical_list: D020099:Coated Materials, Biocompatible; D019279:Resin Cements; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate