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Abstract
Most clinicians agree that impaired nasal breathing results in obligatory mouth breathing. Some believe that mouth breathing influences dentofacial growth.
Constricted maxilla is a common orthodontic problem which needs correction to avoid its sequelae. Treatment with RME increases the width of the maxilla and reduces nasal resistance thus improving breathing mode as the width of the nasal cavity at the floor of the nose increased markedly.
Rapid maxillary expansion could be considered as an answer to regain the patent and adequate nasal airway as a result of the lateral expansion of both upper dental arch and the maxillary air sinus, besides allowing normal growth of the dentofacial skeleton in the growing individuals through restoring normal function of the stomatognathic system. The aim of this study was to evaluate the effects of RME on the correction of the nasal airflow.