title: [Analysis of the effect of relieving dental crowding by using a newly designed low frictional force single-wing bracket on typodont model].
abstract: OBJECTIVE
  To compare the effect of relieving dental crowding by using a newly designed low frictional force single-wing bracket and conventional MBT brackets on typodont model.
  
  
  METHODS
  Two replicated typodont models were made with a same crowded upper arch. The two different types of bracket were bound separately on two typodont models. Clinical course was simulated with warm bath. The typodont models' crowded upper arch was aligned with 0.014 NiTi. The data were analyzed for t test using SPSS12.0 software package.
  
  
  RESULTS
  In the MBT bracket group, the degree of the dental crowding reduced 2.58mm, compared with 5.49mm in the newly designed group.Significant difference between self-ligating brackets and conventional design was found between the two groups(P<0.05).
  
  
  CONCLUSIONS
  It is indicated that the newly designed low frictional force single-wing-bracket relieves dental crowding faster than the conventional MBT bracket on typodont model.
authors.affiliation: Department of Stomatology, Haiyan People's Hospital, Haiyan 314300, Zhejiang Province, China. 627050704@qq.com
authors.forename: Jian-guo
authors.initials: JG
authors.lastname: Zhou
authors.forename: Jian-yin
authors.initials: JY
authors.lastname: Feng
mesh_terms: D000818:Animals; D003722:Dental Alloys; D017276:Friction; D006801:Humans; D008310:Malocclusion; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D014921:Wings, Animal
chemical_list: D003722:Dental Alloys