The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Three dimensional analysis of the upper airway and facial morphology in children with Class II malocclusion using cone-beam computed tomography

Cone-beam CT를 이용한 제II급 부정교합 아동의 상기도 형태에 관한 3차원적 연구

  • Hong, Ji-Suk (Department of Orthodontics, Kangdong Sacred Heart Hospital, Hallym University Medical Center) ;
  • Kim, Dae-Sung (Graduate School of Hallym University) ;
  • Oh, Kyung-Min (Department of Orthodontics, Kangdong Sacred Heart Hospital, Hallym University Medical Center) ;
  • Kim, Yoon-Ji (Department of Orthodontics, Kangdong Sacred Heart Hospital, Hallym University Medical Center) ;
  • Lee, Kyu-Hong (Public Health Center of Namyangju-si) ;
  • Park, Yang-Ho (Department of Orthodontics, Kangdong Sacred Heart Hospital, Hallym University Medical Center)
  • 홍지숙 (한림대학교 의료원 강동성심병원 치과교정과) ;
  • 김대성 (한림대학교 대학원) ;
  • 오경민 (한림대학교 의료원 강동성심병원 치과교정과) ;
  • 김윤지 (한림대학교 의료원 강동성심병원 치과교정과) ;
  • 이규홍 (남양주시 보건소) ;
  • 박양호 (한림대학교 의료원 강동성심병원 치과교정과)
  • Received : 2009.12.29
  • Accepted : 2010.03.31
  • Published : 2010.06.30
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Abstract

Objective: The aim of this study was to evaluate the volumes and areas of the upper airways in children with Class II malocclusion, using three dimensional cone-beam computed tomography (CBCT) and to compare the volumetric and cross-sectional measurements and cephalometric variables to investigate possible relationships between the upper airway and facial morphology. Methods: CBCT scans were obtained from 37 subjects (17 boys and 20 girls; average age, 11.02 years). The upper airway volumes and areas were measured, and compared with cephalometric variables. Results: The area of the PNS-posterior plane ($S_{PP}$) was significantly smaller in the Class II malocclusion group (p < 0.05). Also, the volumetric and cross-sectional measurements were lower in Class II than in Class I malocclusion groups, although the differences were not significant between the two groups (p > 0.05). The Class II malocclusion group showed significantly smaller values of PFH, mandibular body length, pog to N perp and showed larger values of FMA, ANB, and facial convexity than the Class I malocclusion group. The volume of the upper airway in front of PNS point (WN) showed negative correlation with ANB (p < 0.05). Conclusions: The Class II malocclusion group had a narrower upper airway associated with a decreased posterior facial height and a divergent growth pattern than the Class I malocclusion group.

성장기 아동의 상기도 협착은 두개안면 성장에 영향을 미칠 수 있다. 본 연구는 3차원 cone-beam computed tomography (CBCT)를 이용하여 제II급 부정교합 아동의 상기도 부피 및 단면적 계측치와 측모두부계측치를 비교하여 상기도와 안면 형태와의 연관성을 알아보고자 하였다. 37명의 아동(남자 17명, 여자 20명, 평균 연령 11.02세)의 CBCT를 촬영하였다. 연구 결과, 상기도의 PNS-posterior plane에서의 단면적($S_{PP}$)은 제II급 부정교합군에서 유의하게 작았다 (p < 0.05). 상기도 부피 계측치는 제II급 부정교합군에서 제I급 부정교합군보다 작았으나, 두 군 간 통계적으로 유의한 차이는 없었다. 제II급 부정교합군은 후안모고경(PFH), mandibular body length (p < 0.05), Pog to Nperp (p < 0.01)에서 제I급 부정교합군보다 유의하게 작은 값을 보였고, FMA (p < 0.05), ANB, facial convexity (p < 0.01)는 유의하게 큰 값을 보였다. 제II급 부정교합군의 PNS 전방의 상기도 부피($W_N$)는 ANB difference 각도와 음의 상관관계를 보였다 (p < 0.05). 제II급 부정교합 아동은 상대적으로 좁은 상기도 부피를 가지며 이에 따른 감소 된 후안모고경(PFH)과 하악골의 divergent한 안면 성장 양상을 보였다.

Keywords

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