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Unpredictability of soft tissue changes after camouflage treatment of Class II division 1 malocclusion with maximum anterior retraction using miniscrews

 Kayoung Kim  ;  Sung-Hwan Choi  ;  Eun-Hee Choi  ;  Yoon-Jeong Choi  ;  Chung-Ju Hwang  ;  Jung-Yul Cha 
 Angle Orthodontist, Vol.87(2) : 230-238, 2017 
Journal Title
 Angle Orthodontist 
Issue Date
Bone Screws* ; Cephalometry ; Female ; Humans ; Incisor ; Lip/anatomy & histology ; Male ; Malocclusion, Angle Class II/therapy* ; Maxilla ; Orthodontic Anchorage Procedures* ; Orthodontics, Corrective/instrumentation* ; Retrospective Studies ; Treatment Outcome ; Young Adult
Skeletal Class II ; Skeletal anchorage ; Soft tissue ; Tooth extraction
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. MATERIALS AND 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.
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2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
차정열(Cha, Jung Yul)
최성환(Choi, Sung Hwan) ORCID logo https://orcid.org/0000-0002-1150-0268
최윤정(Choi, Yoon Jeong) ORCID logo https://orcid.org/0000-0003-0781-8836
황충주(Hwang, Chung Ju) ORCID logo https://orcid.org/0000-0003-3024-4551
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