Evaluation of the Pharyngeal Airway Space Before and after Bi-Lateral Sagittal Split Osteotomy Surgery using Three-Dimensional Cone Beam Computed Tomography

Sameer Khan,K.S Nagachandran,Janani Jayapal,Devaki Vijayalakshmi,S Karthik,Abinaya Somaskandhan

doi:10.34257/gjmrjvol20is1pg29

Abstract

Objectives: To evaluate the changes in the pharyngeal airway space (PAS) before and after bi-lateral sagittal split osteotomy (BSSO) surgery using a three-dimensional cone-beam computed tomography (3D-CBCT). Material and Methods: The sample consisted of patients (n=7), aged between 21-30 years, having a skeletal Class II with retrognathic mandible and orthognathic maxilla who underwent orthodontic treatment and were advised for BSSO advancement surgery. Pre-surgical CBCT scans were taken a week before the surgery (T0) and the post-treatment records, three months after the surgery (T1). The 3D PAS was reconstructed from the CBCT scans, and the volumetric changes were evaluated.

Highlights

Our findings suggest that bilateral mandibular advancement surgery in patients with retrognathic mandible increases the Pharyngeal Airway Space (PAS) volume anatomically and enhances the breathing functionally
Before the CBCT scan, the patients were fully informed about the purpose of this study and the radiation risks associated with the scan
All the patients included in this study were from the department of orthodontics, meenakshi ammal dental college and hospital who have reported for orthodontic treatment

Summary

Introduction

The upper airway has long been an area of interest in orthodontics, with topics such as the relationships between facial type and airway,[1] airway shape and volume with growth and development[2] and the clinician’s potential to modify the airway through scans.[9,10] the three-dimensional diagnosis of the airway is more reliable with the Cone Beam Computed Tomography with the reduced radiation dose.[11]The isolation of the hard and soft tissue structures based on the variations in their densities is apparent in a CBCT image, which allows the segmentation and visualization of hollow structures such as the airway, and the analysis of the airway volume are Author α: BDS, MDS, Post graduate, Dept of orthodontics and easy with the use of appropriate software.dentofacial orthopaedics, Meenakshi Ammal Dental College.Author ρ: BDS, MDS, Professor, Dept of orthodontics and dentofacial advocated as a treatment option for skeletal orthopaedics, Meenakshi Ammal Dental College. The isolation of the hard and soft tissue structures based on the variations in their densities is apparent in a CBCT image, which allows the segmentation and visualization of hollow structures such as the airway, and the analysis of the airway volume are Author α: BDS, MDS, Post graduate, Dept of orthodontics and easy with the use of appropriate software. Author ρ: BDS, MDS, Professor, Dept of orthodontics and dentofacial advocated as a treatment option for skeletal orthopaedics, Meenakshi Ammal Dental College. Author Ѡ: Senior lecturer, Dept of orthodontics and dentofacial orthopaedics, Meenakshi Ammal Dental College. Author ¥ §: Post graduate, Dept of orthodontics and dentofacial orthopaedics, Meenakshi Ammal Dental College

Objectives

Methods

Conclusion