[Effect of rapid maxillary expansion on respiratory problems: 10-year retrospective study].

Rhinomanometric studies have demonstrated that the maxillary fast expantion (ERM) reduces the nasal resistance of the air conduct and thus achieving the normal limits, in must cases. The hypotesis is that breathing will change from buccal to nasal, concluding that the nasal defense mechanisms (filtration, humidification and warming of inhaled air) will reduce some respiratory pathologies.