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KMID : 0361920100400030134
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Korean Journal of Orthodontics
2010 Volume.40 No. 3 p.134 ~ p.144
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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
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Hong Ji-Suk
Kim Yoon-Ji
Park Yang-Ho
Kim Dae-Sung
Oh Kyung-Min
Lee Hong-Kyu
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Abstract
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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 (SPP) 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.
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KEYWORD
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Upper airway, CBCT, Class II malocclusion, Facial morphology
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