Objectives: To test the hypothesis that there is no association between sagittal maxillomandibular relationship and pharyngeal airway passage dimensions. Materials and methods: Lateral cephalograms of 90 subjects were used to measure the upper pharyngeal airway. The subjects were divided into three groups (each group included 30 subjects) according to ANB angle: Class III (ANB < 0.7°); Class I (ANB > 0.7° and < 4.7°); Class II (ANB > 4.7°). All lateral cephalograms were traced manually. Results: The results showed a significant reduction in the upper airway at the level of nasopharynx and oropharynx and the airway showed a tendency to decrease from Class III to Class I and Class I to Class II. Conclusion: Sagittal skeletal pattern had a close association between the pharyngeal airway passage and the dimensions of the pharyngeal airway passage. The dimensions of pharyngeal airway passage were decreased from Class III to Class I and Class I to Class II subjects.

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