Effects of bodily retraction of mandibular incisors versus mandibular setback surgery on pharyngeal airway space: A comparative study
금병탁, 최성환, 최윤정, 백형선, 이기준,
소속 상세정보
금병탁 ( Keum Byeong-Tak ) - Yonsei University College of Dentistry Department of Orthodontics
최성환 ( Choi Sung-Hwan ) - Yonsei University College of Dentistry Department of Orthodontics
최윤정 ( Choi Yoon-Jeong ) - Yonsei University College of Dentistry Department of Orthodontics
백형선 ( Baik Hyoung-Seon ) - Yonsei University College of Dentistry Department of Orthodontics
이기준 ( Lee Kee-Joon ) - Yonsei University College of Dentistry Department of Orthodontics
Abstract
Objective: The purpose of this study was to compare the changes induced inthe pharyngeal airway space by orthodontic treatment with bodily retractionof the mandibular incisors and mandibular setback surgery without extraction.
Methods: This retrospective study included 63 adult patients (32 men and 31women). Thirty-three patients who had been treated via four-bicuspid extractionand bodily retraction of the mandibular incisors (incisor retraction, IR group)were compared with 30 patients who had been treated via mandibular setbacksurgery (MS group) without extraction. Lateral cephalograms were acquired andanalyzed before (T1) and after treatment (T2).
Results: The superior pharyngealairway space did not change significantly in either group during treatment. Themiddle 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.
키워드
Bodily retraction; Miniscrew; Mandibular setback surgery; Pharyngeal airway space
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