Correlation between the Pharyngeal Airway Space and Head Posture after Surgery for Mandibular Prognathism

Figure 1

S: sella; N: nasion; Me: menton; ANS: anterior nasal spine; PNS: posterior nasal spine; G: most prominent point on the posterior border of the mandibular symphysis; UT: tip of uvula; C4: inferoanterior point on the fourth cervical vertebra; TT: tip of the tongue; E: most superior point on the epiglottis; V: vallecula epiglottica; H: most superior and anterior point on the hyoid bone; and TH: highest point on the tongue (greatest vertical distance to the H-G line). Green lines: C4S line, ANS-PNS line, and H-G line. Red lines: 1: NSP: nasopharyngeal airway, 2: UOP: upper oropharyngeal airway, 3: LOP: lower oropharyngeal airway, 4: LGP: laryngopharyngeal airway, 5: tongue depth, 6: tongue length, and 7: H-E length.