Rapid Maxillary Expansion Increases Internal Nasal Dimensions of Children With Bilateral Cleft Lip and Palate

Objective:  The transverse maxillary deficiency frequently observed in patients with cleft lip and palate (CLP) is usually treated by rapid maxillary expansion (RME). Considering that RME causes a significant increase of the internal nasal dimensions in children with unilateral CLP (UCLP), this study aimed to characterize the internal nasal geometry of children with bilateral CLP (BCLP) and transverse maxillary deficiency using acoustic rhinometry. The study also aimed to analyze changes caused by RME. Design:  Cross-sectional prospective study. Setting:  Laboratory of Physiology, Hospital for Rehabilitation of Craniofacial Anomalies, University of Sao Paulo, Bauru, SP, Brazil. Participants:  Fifteen children with repaired BCLP of both genders, aged 8 to 15 years, referred for RME, were prospectively analyzed. Interventions:  Subjects underwent acoustic rhinometry before the expander installation and after the active phase of expansion. Cross-sectional areas (CSA) and volumes (V) of the nasal valve region...