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Effects of bodily retraction of mandibular incisors versus mandibular setback surgery on pharyngeal airway space: A comparative study

Authors
 Byeong-Tak Keum  ;  Sung-Hwan Choi  ;  Yoon Jeong Choi  ;  Hyoung-Seon Baik  ;  Kee-Joon Lee 
Citation
 Korean Journal of Orthodontics (대한치과교정학회지), Vol.47(6) : 344-352, 2017 
Journal Title
 Korean Journal of Orthodontics (대한치과교정학회지) 
ISSN
 1225-5610 
Issue Date
2017
Keywords
Bodily retraction ; Mandibular setback surgery ; Miniscrew ; Pharyngeal airway space
Abstract
OBJECTIVE: The purpose of this study was to compare the changes induced in the pharyngeal airway space by orthodontic treatment with bodily retraction of the mandibular incisors and mandibular setback surgery without extraction. METHODS: This retrospective study included 63 adult patients (32 men and 31 women). Thirty-three patients who had been treated via four-bicuspid extraction and bodily retraction of the mandibular incisors (incisor retraction, IR group) were compared with 30 patients who had been treated via mandibular setback surgery (MS group) without extraction. Lateral cephalograms were acquired and analyzed before (T1) and after treatment (T2). RESULTS: The superior pharyngeal airway space did not change significantly in either group during treatment. The middle pharyngeal airway space decreased by 1.15 ± 1.17 mm and 1.25 ± 1.35 mm after treatment in the IR and MS groups, respectively, and the decrease was comparable between the two groups. In the MS group, the inferior pharyngeal airway space (E-IPW) decreased by 0.88 ± 1.67 mm after treatment (p < 0.01). The E-IPW was larger in the MS group than in IR group at T1, but it did not differ significantly between the two groups at T2. No significant correlation was observed between changes in the pharyngeal airway space and the skeletal and dental variables in each group. CONCLUSIONS: The middle pharyngeal airway space decreased because of the posterior displacement of the mandibular incisors and/or the mandibular body. The E-IPW decreased only in the MS group because of the posterior displacement of only the mandibular body.
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/161309
DOI
10.4041/kjod.2017.47.6.344
Appears in Collections:
1. Journal Papers (연구논문) > 2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실)
Yonsei Authors
백형선(Baik, Hyoung Seon) ; 이기준(Lee, Kee Joon) ; 최성환(Choi, Sung Hwan) ; 최윤정(Choi, Yoon Jeong)
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