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BMC Oral Health
Published in: BMC Oral Health 1/2023

Open Access 01-12-2023 | Computed Tomography | Research

Quantification of pharyngeal airway space changes after two-jaw orthognathic surgery in skeletal class III patients

Authors: Ziqi Zhang, Shuze Wang, Jing Li, Zhijie Yang, Xia Zhang, Xiaofeng Bai

Published in: BMC Oral Health | Issue 1/2023

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Abstract

Background

Skeletal class III malocclusion is a common dentofacial deformity. Orthognathic treatment changes the position of the jaws and affects the shape of the upper airway to some extent. The aim of this study was to use multislice spiral computer tomography data and orthognathic knowledge to quantify the relationship between the amount of surgical movement of the maxilla or mandible in all three spatial planes and the changes in airway volume that occurred.

Methods

A retrospective study of 50 patients was conducted. Preoperative and postoperative linear changes related to skeletal movements of the maxilla and mandible were measured and compared to changes in the most constricted axial level (MCA) and its anteroposterior (MCA-AP) and transverse diameters (MCA-TV). Correlation tests and linear regression analysis were performed.

Results

Significant interactions were observed between the anterior vertical movement of the maxilla and the MCA-AP. The anteroposterior movement distance of the mandible was significantly correlated with changes in the oropharyngeal, velopharyngeal, total airway volume, MCA, MCA-AP, and MCA-TV. The change in the mandibular plane angle was significantly correlated with the change in velopharyngeal volume, total airway volume (nasopharynx, oropharynx, velopharynx), and MCA.
The linear regression model showed that oropharyngeal volume decreased by 350.04 mm3, velopharyngeal volume decreased by 311.50 mm3, total airway volume decreased by 790.46 mm3, MCA decreased by 10.96 mm2 and MCA-AP decreased by 0.73 mm2 when point B was setback by 1 mm.

Conclusions

Anteroposterior mandibular control is the key to successful airway management in all patients. This study provides estimates of volume change per millimeter of setback to guide surgeons in treatment planning.
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Metadata
Title
Quantification of pharyngeal airway space changes after two-jaw orthognathic surgery in skeletal class III patients
Authors
Ziqi Zhang
Shuze Wang
Jing Li
Zhijie Yang
Xia Zhang
Xiaofeng Bai
Publication date
01-12-2023
Publisher
BioMed Central
Published in
BMC Oral Health / Issue 1/2023
Electronic ISSN: 1472-6831
DOI
https://doi.org/10.1186/s12903-023-03075-y

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