Abstract
The purpose of the present study was to calculate the average anteroposterior size of the nasopharyngeal airway in 109 children (54 mouth breathers, in whom adenoidectomy was indicated for nasal obstruction, and 55 nose breathers) from 6 to 12 years of age, in order to obtain cephalometric standard; from these standards, one is able to judge the extent to which nose breathing may be obstructed. The results show when planning orthodontic therapy, in which it is desirable to assess the ability of the patient to breath through the nose, a clinical record of the mode of breathing can be supplemented with radiocephalometric data on the anteroposterior size of the nasopharyngeal airway.

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