Abstract
Slow maxillary expansion is a technique used to achieve correction of maxillary transverse deficiency or posterior crossbite in patients where the midpalatal suture has closed. This is mostly achieved by buccal tipping of maxillary posterior teeth. The aim of this case report is to discuss the orthodontic treatment of a 20-year-old patient with bilateral posterior crossbite. The patient had moderate maxillary crowding and severe mandibular crowding, crossbites bilaterally on his posterior teeth, and maxillary lateral incisors. The patient had thin gingival biotype with gingival recession on the mandibular right canine. Orthodontic treatment was done with full fixed appliances, and extraction of a mandibular right lateral incisor. This case report shows that slow maxillary expansion can be used in an adult to achieve the objectives set by both the orthodontist and patient while also considering treatment modalities most agreeable to the patient. Key words:Orthodontic treatment, slow maxillary expansion, maxillary expansion, RPE, Hyrax expander, case report.