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KMID : 0361920100400030145
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Korean Journal of Orthodontics
2010 Volume.40 No. 3 p.145 ~ p.155
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Three dimensional cone-beam CT study of upper airway change after mandibular setback surgery for skeletal Class III malocclusion patients
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Kim Na-Ri
Park Soo-Byung
Kim Yong-Il
Hwang Dae-Seok
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Abstract
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Objective: Lateral cephalometric radiographs have been the main form of resource for assessing two dimensional
anteroposterior airway changes. The purpose of this study was to evaluate the three dimensional volumetric
change in the upper airway space in Class III malocclusion patients who underwent mandibular setback surgery.
Methods: Three dimensional cone-beam computed tomographs (CBCT) and their three dimensional reconstruction images were analyzed. The samples consisted of 20 adult patients (12 males and 8 females) who
were diagnosed as skeletal Class III and underwent mandibular setback surgery. CBCTs were taken at 3 stages
- Baseline (1.8 weeks before surgery), T1 (2.3 months after surgery), and T2 (1 year after surgery). Pharyngeal
airway was separated according to the reference planes and reconstructed into the nasopharynx, the oropharynx
and the hypopharynx. Measurements at Baseline, T1, and T2 were compared between groups.
Results: The result showed the volume of the pharyngeal airway decreased significantly 2.3 months after surgery (p ＜ 0.001) and the diminished airway did not recover after 1 year post-surgery. The oropharynx was the most decreased
area.
Conclusions: These findings suggest that mandibular setback surgery causes both short-term and long-term
decrease in the upper airway space.
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KEYWORD
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Cone-beam computed tomography, Orthognathic surgery, Pharyngeal airway
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