The conservative treatment of Class I malocclusion with maxillary transverse deficiency and anterior teeth crowding

This report describes the treatment of a 15-year-old female patient with Angle Class I malocclusion, severe maxillary anterior crowding, maxillary midline shift to the left, and maxillary atresia associated with posterior crossbite. The treatment consisted of palatal expansion using a modified Haas expander and placement of a standard Edgewise fixed appliance. Interproximal reduction was performed on mandibular incisors and canines to align anterior teeth, as well as to reduce Bolton discrepancy due to wide mandibular teeth. This case was submitted to the Committee of the Brazilian Board of Orthodontics and Facial Orthopedics (BBO) in the Free Case category as part of the requisites to obtain the BBO Diploma.