“…Thanks to the introduction of CBCT, a renewed interest in the field of upper airway characterization has been recently generated, causing a huge increase in publications in orthodontics and oromaxillofacial surgery (Grauer et al, 2009;Iwasaki et al, 2009;Kim et al, 2010;Lenza et al, 2010 andAlves et al, 2012). Recent CBCT studies found interesting results in the study of the pharyngeal airway in patients undergoing orthognathic surgery (Hong et al, 2011a), observing the relationship of skeletal, dental, and oropharyngeal airway volume and nasal passage volume changes after quick maxillary expansion (El et al, 2011), or analysing pharyngeal space according to skeletal class malocclusion or facial pattern (Hong et al2011b; M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 5 tridimensional assessment and airway anatomical limit definition. Gravity can produce movements in oropharyngeal structures in response to postural changes between sitting upright and lying in the supine position (Sutthiprapaporn et al, 2008).…”