title: Effect of surgical mandibular advancement on pharyngeal airway dimensions: a three-dimensional computed tomography study.
abstract: The aim of this study was to quantify the changes in pharyngeal airway space (PAS) in patients with a skeletal class II malocclusion managed by bilateral sagittal split ramus osteotomy for mandibular advancement, using three-dimensional (3D) registration. The sample comprised 16 patients (mean age 21.69±2.80 years). Preoperative (T0) and postoperative (T1) computed tomography scans were recorded. Linear, cross-sectional area (CSA), and volumetric parameters of the velopharynx, oropharynx, and hypopharynx were evaluated. Parameters were compared with paired samples t-tests. Highly significant changes in dimension were measured in both sagittal and transverse planes (P<0.001). CSA measurements increased significantly between T0 and T1 (P<0.001). A significant increase in PAS volume was found at T1 compared with T0 (P<0.001). The changes in PAS were quantified using 3D reconstruction. Along the sagittal and transverse planes, the greatest increase was seen in the oropharynx (12.16% and 11.50%, respectively), followed by hypopharynx (11.00% and 9.07%) and velopharynx (8.97% and 6.73%). CSA increased by 41.69%, 34.56%, and 28.81% in the oropharynx, hypopharynx, and velopharynx, respectively. The volumetric increase was greatest in the oropharynx (49.79%) and least in the velopharynx (38.92%). These established quantifications may act as a useful guide for clinicians in the field of dental sleep medicine.
authors.affiliation: Military Dental Centre, Jabalpur, India. Electronic address: gk81sk@yahoo.com.
authors.forename: G D
authors.initials: GD
authors.lastname: Kochar
authors.affiliation: Military Dental Centre, Jabalpur, India.
authors.forename: A
authors.initials: A
authors.lastname: Chakranarayan
authors.affiliation: Hitkarni Dental College and Hospital, Jabalpur, India.
authors.forename: S
authors.initials: S
authors.lastname: Kohli
authors.affiliation: Hitkarni Dental College and Hospital, Jabalpur, India.
authors.forename: V S
authors.initials: VS
authors.lastname: Kohli
authors.affiliation: Department of Radio-diagnosis and Imaging, Military Hospital, Jabalpur, India.
authors.forename: V
authors.initials: V
authors.lastname: Khanna
authors.affiliation: Research and Referral Hospital, New Delhi, India.
authors.forename: B
authors.initials: B
authors.lastname: Jayan
authors.affiliation: Research and Referral Hospital, New Delhi, India.
authors.forename: S S
authors.initials: SS
authors.lastname: Chopra
authors.affiliation: 33 CDU, India.
authors.forename: M
authors.initials: M
authors.lastname: Verma
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008313:Malocclusion, Angle Class III / Q000601:surgery*; D019186:Mandibular Advancement / Q000379:methods*; D010614:Pharynx / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
keywords: BSSRO; pharyngeal airway space; skeletal class II malocclusion