title: Sliding resistance of polycarbonate self-ligating brackets and stainless steel esthetic archwires.
abstract: OBJECTIVE
  To compare the sliding resistance forces produced by polycarbonate self-ligating brackets with esthetic archwires.
  
  
  METHODS
  Samples of Opal, Oyster and conventional Blonde brackets were tested each one with 30 segments of .018x.025-in wires. The archwires were slipped at 8mm/min for 40 seconds with an universal testing machine. Two way ANOVA with Bonferroni correction were used.
  
  
  RESULTS
  Blonde brackets presented the highest sliding resistance, followed in decreasing order by Oyster and Opal. The TP Shiny Bright Wire produced the highest surface friction, while the lowest was observed for Imagination archwires (except for Opal brackets where the TP Pearltone Wire achieved the best performance).
  
  
  CONCLUSIONS
  Self-ligating system is more effective to reduce the sliding force resistance than conventional brackets. Esthetic stainless steel archwires produce less friction resistance than those without surface treatment. Polycarbonate self-ligating brackets are more effective to reduce the frictional forces than esthetic archwires with surface treatment.
authors.affiliation: Department of Orthodontics, State University of Rio de Janeiro and Department of Materials Science, Military Institute of Engineering, Rio de Janeiro, Brazil. fernandes.dj@gmail.com
authors.forename: Marco
authors.initials: M
authors.lastname: Hiroce
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Fernandes
authors.forename: Carlos N
authors.initials: CN
authors.lastname: Elias
authors.forename: Jose Augusto M
authors.initials: JA
authors.lastname: Miguel
mesh_terms: D003722:Dental Alloys / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D017276:Friction; D005898:Glass / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008953:Models, Anatomic; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D011108:Polymers / Q000737:chemistry*; D013193:Stainless Steel / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D003722:Dental Alloys; D003764:Dental Materials; D011108:Polymers; C009753:fiberglass; D013193:Stainless Steel; C017902:lexan