title: [An experimental study of the regional load deflection rate of multiloop edgewise arch wire in two dimension brackets].
abstract: OBJECTIVE
  To compare the regional load deflection rate (LDR) of multiloop edgewise arch wire (MEAW) of three dimensions with coupled use of two dimension brackets in the individual interbracket span, to understand the mechanical properties of MEAW.
  
  
  METHODS
  The MEAW arch wires of stainless steel of three dimensions, 0.41 mm x 0.56 mm, 0.43 mm x 0.64 mm and 0.46 mm x 0.64 mm, were bent into single L-loop. The study was performed with the coupled use of 0.41 mm x 0.56 mm wires with 0.46 mm x 0.64 mm bracket (A bracket) and 0.43 mm x 0.64 mm, 0.46 mm x 0.64 mm wires with 0.56 mm x 0.71 mm bracket (B bracket). The LDR of each L-loop at the individual interbracket span when loading and unloading was measured. The data were analysed by SPSS 11.0.
  
  
  RESULTS
  Compared the regional LDR for the couple of 0.41 mm x 0.56 mm L-loop with A bracket with those for the couple of 0.43 mm x 0.64 mm L-loop with B bracket, the former showed lower value than the latter at regions between the upper central and lateral incisor, the lower central and lateral incisor, and between the lower lateral incisor and canine (P < 0.05). For the rest regions, the two couples exhibited similar value to the regional LDR (P > 0.05). The regional LDR for the couple of 0.41 mm x 0.56 mm L-loop with A bracket were lower at all regions than those for the couple of 0.46 mm x 0.64 mm L-loop with B bracket (P < 0.05) except that at the region between the lower first and second molars which showed similar value between the two couples.
  
  
  CONCLUSIONS
  The coupled use of B bracket with 0.43 mm x 0.64 mm MEAW arch wire and A bracket with 0.41 mm x 0.56 mm MEAW arch wire exhibited similar mechanical properties.
authors.affiliation: Dept. of Orthodontics, School of Stomatology, Nanchang University, University, Nanchang 330006, China.
authors.forename: Qi-shun
authors.initials: QS
authors.lastname: Li
authors.forename: Zhi-hua
authors.initials: ZH
authors.lastname: Li
authors.forename: Jian-yong
authors.initials: JY
authors.lastname: Wu
mesh_terms: D006801:Humans; D008963:Molar; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D013193:Stainless Steel
chemical_list: D013193:Stainless Steel