title: [Retrospective study of Class II malocclusion patients with one lower incisor extraction treatment].
abstract: OBJECTIVE
  To evaluate the indication and characteristics of lower incisor extraction orthodontics.
  
  
  METHODS
  Thirty-four lower incisor extracted patients with satisfied effect were included in the study. The lateral cephalometric radiographs and casts were measured to observe the change before and after orthodontic treatment, then the difference was analyzed with paired-samples t test using SPSS11.0 software package.
  
  
  RESULTS
  Different degree mismatch in Bolton index was found in most patients. The measurements of the upper anterior dental arch length and the U1-SN angle were significantly decreased (P<0.01). The upper anterior dental arch width and the U1-L1 angle were found significantly increased (P<0.01).
  
  
  CONCLUSIONS
  Mandibular incisor extraction can be an effective treatment option in selected cases, particularly in those Class II malocclusion patients with 2-premolar-extraction. To reach an ideal effect with matched dental arch and ideal occlusion, one should pay attention to the indication and the incisor protrusion. Supported by Key Science and Technology Program of Shandong Province (Grant No.2010GSF10269).
authors: Department of Orthodontics, College of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine. Jinan 250012, Shandong Province, China.
authors: Tao
authors: T
authors: Lv
authors: Ding
authors: D
authors: Bai
authors: Chun-Ling
authors: CL
authors: Wang
mesh_terms: D001641:Bicuspid; D002508:Cephalometry; D003724:Dental Arch; D006801:Humans; D007180:Incisor; D008310:Malocclusion; D008334:Mandible; D009971:Orthodontics, Corrective; D012189:Retrospective Studies; D014081:Tooth Extraction; D016896:Treatment Outcome