Objectives. To evaluate the nasal cycle in young children by rhinomanometry and to point out its characteristics and orthodontic implications. Materials and methods. Air pressure and air flow in nasal cavities of 10 young patients have been analyzed by a Markos NR 4 equipment. Ten registrations in five hours were performed with an interval of 30minutes. Every registration was performed with three values of constant flux at 50,100,150cm 3/sec and a pressure of 100 Pascal. Results. The resistance of nasal cavities was inversely proportional showing a recurrent trend through time. Time between two similar phases was not measured. A large interindividual and intraindividual variation was recorded. Conclusions. Rhinomanometric evaluation revealed to be a non invasive analysis very useful both for diagnosis and treatment. It is also often altered by transverse maxillary hypoplasia.
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