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Position of the hyoid bone and its correlation with airway dimensions in different classes of skeletal malocclusion using cone-beam computed tomography.

Authors
  • Shokri, Abbas1
  • Mollabashi, Vahid2
  • Zahedi, Foozie1
  • Tapak, Leili3
  • 1 Dental Implant Research Center, Department of Oral and Maxillofacial Radiology, Dental School, Hamadan University of Medical Sciences, Hamadan, Iran. , (Iran)
  • 2 Department of Orthodontics, Dental School, Dental Research Center, Hamadan University of Medical Sciences, Hamadan, Iran. , (Iran)
  • 3 Department of Biostatistics, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran. , (Iran)
Type
Published Article
Journal
Imaging science in dentistry
Publication Date
Jun 01, 2020
Volume
50
Issue
2
Pages
105–115
Identifiers
DOI: 10.5624/isd.2020.50.2.105
PMID: 32601585
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

This study investigated the position of the hyoid bone and its relationship with airway dimensions in different skeletal malocclusion classes using cone-beam computed tomography (CBCT). CBCT scans of 180 participants were categorized based on the A point-nasion-B point angle into class I, class II, and class III malocclusions. Eight linear and 2 angular hyoid parameters (H-C3, H-EB, H-PNS, H-Me, H-X, H-Y, H-[C3-Me], C3-Me, H-S-Ba, and H-N-S) were measured. A 3-dimensional airway model was designed to measure the minimum cross-sectional area, volume, and total and upper airway length. The mean cross-sectional area, morphology, and location of the airway were also evaluated. Data were analyzed using analysis of variance and the Pearson correlation test, with P values <0.05 indicating statistical significance. The mean airway volume differed significantly among the malocclusion classes (P<0.05). The smallest and largest volumes were noted in class II (2107.8±844.7 mm3) and class III (2826.6±2505.3 mm3), respectively. The means of most hyoid parameters (C3-Me, C3-H, H-Eb, H-Me, H-S-Ba, H-N-S, and H-PNS) differed significantly among the malocclusion classes. In all classes, H-Eb was correlated with the minimum cross-sectional area and airway morphology, and H-PNS was correlated with total airway length. A significant correlation was also noted between H-Y and total airway length in class II and III malocclusions and between H-Y and upper airway length in class I malocclusions. The position of the hyoid bone was associated with airway dimensions and should be considered during orthognathic surgery due to the risk of airway obstruction. Copyright © 2020 by Korean Academy of Oral and Maxillofacial Radiology.

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