In 20 adult cleft patients, the influence of a Le-Fort-I-osteotomy and ventral-caudal advancement of the maxilla on nasal breathing was studied. An increase of nasal air flow in the majority of patients is due to an increase in the volume of nasal skeleton and/or in the nasolabial angle and alar nasal base. Rhinomanometric measurements and X-ray examination confirm the results.
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