Airway increase after open bite closure with temporary anchorage devices for intrusion of the upper posteriors: Evidence from 2D cephalometric measurements and 3D magnetic resonance imaging

Abstract

Counterclockwise rotation of the mandible after anterior open bite closed using orthodontic treatment changed the airway morphology. Retroglossal volume significantly increased and the airway shape became less elliptical after bite closure.

Novel prediction models for pharyngeal‐airway volume based on the cranial‐base and midsagittal cross‐sectional area of the airway in the pharyngeal region: A cephalometric and magnetic resonance imaging study

“…Using MRI to evaluate the pharyngeal-airway morphology of children and adult patients has recently increased. 10,18,19 Orthodontists often require MRI scans to analyse the anatomy of the temporomandibular joint, estimate the degree of airway obstruction and assess the upper airway volume in orthodontic patients. 10,11,18 The advantage of MRI is that it provides high soft tissue contrast without radiation exposure.…”

“…10,18,19 Orthodontists often require MRI scans to analyse the anatomy of the temporomandibular joint, estimate the degree of airway obstruction and assess the upper airway volume in orthodontic patients. 10,11,18 The advantage of MRI is that it provides high soft tissue contrast without radiation exposure. 10,11 Therefore, we used pre-treatment MRI scans to measure the PAV, whereas pre-treatment lateral cephalometric scans were used to measure the craniofacial data and MCSA-PR.…”

“…A sensitivity threshold of 73 was used for airway measurements. 17,18 Images were re-oriented by aligning the palatal plane parallel to the horizontal plane in the midsagittal section. 18 Definitions of all landmarks used herein are presented in Table S1.…”

“…17,18 Images were re-oriented by aligning the palatal plane parallel to the horizontal plane in the midsagittal section. 18 Definitions of all landmarks used herein are presented in Table S1. A single investigator (orthodontist JH) performed all measurements.…”

“…11 Consequently, some researchers have used magnetic resonance imaging (MRI) as an alternative method for evaluating the 3D airway size. 10,18,19 MRI provides information equivalent to that obtained using CBCT while avoiding patient radiation exposure. 11 Therefore, this study's pharyngeal-airway volume (PAV) was obtained using MRI.…”