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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Korean J Orthod   

First Published Date November 23, 2022

Copyright © The Korean Association of Orthodontists.

Three-dimensional evaluation of the pharyngeal airway space in patients with anterior open bite

Seong-Sik Kima, Yong-Il Kima, Soo-Byung Parka, and Sung-Hun Kimb

aProfessor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea.
bAssistant professor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea.

Correspondence to:Sung-Hun Kim, assistant professor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, Korea. 50612, Tel: 82-55-360-5164, Fax: 82-55-360-5154, E-mail: kmule@hanmail.net

Abstract

Objective: The purpose was to three-dimensionally evaluate the pharyngeal airway space (PAS) of subjects with anterior open bite (AOB) using cone-beam computed tomography (CBCT) and compare them with subjects with normal occlusion.
Methods: While the open bite group (OBG, n = 25) comprised subjects with anterior overbite of -3 mm or less, the control group (n = 25) comprised age- and sex-matched subjects with anterior overbite of 1–3 mm, Angle Class I malocclusion (1°≤ ANB≤4°), and normodivergent profile (22°≤ Frankfort–mandibular plane angle≤28°). After the CBCT data were reconstructed into a three-dimensional image, PAS was segmented into four parts, and the volume of each part was measured. The pharyngeal airway length (PAL) and minimal constriction parts were also measured. Pearson's correlation analysis was used to evaluate the correlation between changes in PAS and the amount of anterior overbite.
Results: OBG showed a significantly narrower airway space in the nasopharyngeal volume, hypopharyngeal volume, and total airway volume. OBG was significantly smaller in the area and transverse width of the minimal constriction part. Statistically longer PAL was observed for OBG. However, there was no correlation between the amount of anterior overbite and the changes in PAS.
Conclusions: PAS was associated with AOB. Patients with AOB had a narrower PAS and a smaller minimal constriction part.

Keywords: PAS was associated with AOB. Patients with AOB had a narrower PAS and a smaller minimal constriction part.

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Korean J Orthod   

First Published Date November 23, 2022

Copyright © The Korean Association of Orthodontists.

Three-dimensional evaluation of the pharyngeal airway space in patients with anterior open bite

Seong-Sik Kima, Yong-Il Kima, Soo-Byung Parka, and Sung-Hun Kimb

aProfessor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea.
bAssistant professor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea.

Correspondence to:Sung-Hun Kim, assistant professor, Department of Orthodontics, Dental Research Institute, and Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, Korea. 50612, Tel: 82-55-360-5164, Fax: 82-55-360-5154, E-mail: kmule@hanmail.net

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective: The purpose was to three-dimensionally evaluate the pharyngeal airway space (PAS) of subjects with anterior open bite (AOB) using cone-beam computed tomography (CBCT) and compare them with subjects with normal occlusion.
Methods: While the open bite group (OBG, n = 25) comprised subjects with anterior overbite of -3 mm or less, the control group (n = 25) comprised age- and sex-matched subjects with anterior overbite of 1–3 mm, Angle Class I malocclusion (1°≤ ANB≤4°), and normodivergent profile (22°≤ Frankfort–mandibular plane angle≤28°). After the CBCT data were reconstructed into a three-dimensional image, PAS was segmented into four parts, and the volume of each part was measured. The pharyngeal airway length (PAL) and minimal constriction parts were also measured. Pearson's correlation analysis was used to evaluate the correlation between changes in PAS and the amount of anterior overbite.
Results: OBG showed a significantly narrower airway space in the nasopharyngeal volume, hypopharyngeal volume, and total airway volume. OBG was significantly smaller in the area and transverse width of the minimal constriction part. Statistically longer PAL was observed for OBG. However, there was no correlation between the amount of anterior overbite and the changes in PAS.
Conclusions: PAS was associated with AOB. Patients with AOB had a narrower PAS and a smaller minimal constriction part.

Keywords: PAS was associated with AOB. Patients with AOB had a narrower PAS and a smaller minimal constriction part.