title: Unpredictability of soft tissue changes after camouflage treatment of Class II division 1 malocclusion with maximum anterior retraction using miniscrews.
abstract: OBJECTIVE
  To compare soft and hard tissue responses based on the degree of maxillary incisor retraction using maximum anchorage in patients with Class II division 1 malocclusion.
  
  
  METHODS
  This retrospective study sample was divided into moderate retraction (<8.0 mm; n = 28) and maximum retraction (≥8.0 mm; n = 29) groups based on the amount of maxillary incisor retraction after extraction of the maxillary and mandibular first premolars for camouflage treatment. Pre- and posttreatment lateral cephalograms were analyzed.
  
  
  RESULTS
  There were 2.3 mm and 3.0 mm of upper and lower lip retraction, respectively, in the moderate group; and 4.0 mm and 5.3 mm, respectively, in the maximum group. In the moderate group, the upper lip was most influenced by posterior movement of the cervical point of the maxillary incisor (β = 0.94). The lower lip was most influenced by posterior movement of B-point (β = 0.84) and the cervical point of the mandibular incisor (β = 0.83). Prediction was difficult in the maximum group; no variable showed a significant influence on upper lip changes. The lower lip was highly influenced by posterior movement of the cervical point of the maxillary incisor (β = 0.50), but this correlation was weak in the maximum group.
  
  
  CONCLUSIONS
  Posterior movement of the cervical point of the anterior teeth is necessary for increased lip retraction. However, periodic evaluation of the lip profile is needed during maximum retraction of the anterior teeth because of limitations in predicting soft tissue responses.
authors: Kayoung
authors: K
authors: Kim
authors: Sung-Hwan
authors: SH
authors: Choi
authors: Eun-Hee
authors: EH
authors: Choi
authors: Yoon-Jeong
authors: YJ
authors: Choi
authors: Chung-Ju
authors: CJ
authors: Hwang
authors: Jung-Yul
authors: JY
authors: Cha
mesh_terms: D001863:Bone Screws; D002508:Cephalometry; D005260:Female; D006801:Humans; D007180:Incisor; D008046:Lip / Q000033:anatomy & histology; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008437:Maxilla; D052280:Orthodontic Anchorage Procedures; D009971:Orthodontics, Corrective / Q000295:instrumentation*; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult
keywords: Skeletal Class II; Skeletal anchorage; Soft tissue; Tooth extraction