title: [A three-dimensional finite element study on composite archwire applied in extraction cases].
abstract: OBJECTIVE
  To explore mechanical properties of the composite archwire (CoAW) applied in extraction cases.
  
  
  METHODS
  The mandibular three dimensional model was established by spiral computed tomography scanning and SOLIDWORKS 2001 PLUS software. The archwire model was established by means of ANSYS software. The mechanical analysis and calculation of CoAW were carried out.
  
  
  RESULTS
  With the diameter of NiTi part of CoAW gradually augmented (the diameter of stainless steel part kept unchanged), the stress on teeth gradually increased. As the diameter of stainless steel part of CoAW gradually augmented (the diameter of NiTi part kept unchanged), the stress on teeth also gradually increased. The CoAW (0.30 mm NiTi round wire combined with 0.36 mm stainless steel round wire) produced the least force on teeth. There was little contradistinction between six kinds of CoAW and stainless steel wire on the stress of posterior teeth.
  
  
  CONCLUSIONS
  The stress on teeth closely correlated with the diameter of the composite archwire.
authors.affiliation: Department of Orthodontics, School of Stomatology, Jilin University, Changchun 130041, China. xinhuasun8@163.com
authors.forename: Xin-hua
authors.initials: XH
authors.lastname: Sun
authors.forename: Xing-nan
authors.initials: XN
authors.lastname: Lin
authors.forename: Xian-chun
authors.initials: XC
authors.lastname: Zhu
authors.forename: Zhen-ping
authors.initials: ZP
authors.lastname: Zhou
mesh_terms: D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D009969:Orthodontic Wires; D009971:Orthodontics, Corrective; D014081:Tooth Extraction