Abstract
Orthognathic surgery is widely used in the treatment of dento-maxillofacial deformities, which changes both the facial appearance and the pharyngeal airway space. The aim of this study was to evaluate cephalometric changes in the pharyngeal airway space before and after orthognathic surgery in patients with Class II and Class III malocclusions. The sample consisted of 38 lateral cephalograms, 17 of patients with Class II who had undergone mandibular advancement, and 21 of patients with Class III who had undergone mandibular setback. Cephalometric analysis of Arnett-Gunson FAB Surgery using Dolphin Imaging 11.5 evaluated point B’ and Pog’. Statistical analysis used Paired t-test at 5% significance level. The increase in the means of point B’ and Pog’ after mandibular advancement was not statistical. Similarly, the means of point B’ and Pog’ did not differ after mandibular setback. Thus, the pharyngeal airway space at the level of B’ and Pog’ kept constant pre and post orthognathic surgery for both Class II and Class III.
Highlights
Dento-maxillofacial deformities can cause changes in the volume of the pharyngeal airway space (PAS), as well as breathing problems if the PAS is reduced enough to result in blockage of air passage
Orthognathic surgery has proved effective as treatment for patients with dento-maxillofacial deformities
Class II treated with mandibular advancement can unblock the pharynx, as there is an increase of the PAS (GOODDAY, 2009)
Summary
Dento-maxillofacial deformities can cause changes in the volume of the pharyngeal airway space (PAS), as well as breathing problems if the PAS is reduced enough to result in blockage of air passage. This obstruction may result in ‘obstructive sleep apnea-hypopnea syndrome’ (GOKCE et al, 2012). Treatment of Class II and III malocclusions involves a multidisciplinary approach and depends on the severity of the deformities. Mandibular setback as treatment for Class III can reduce the PAS, given that the ligaments and muscles of the tongue are connected to the hyoid bone and the mandible.
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