Upper midline deviation: Modified Hyrax expander

Background The Hyrax rapid palatal expander is useful for patients in mixed dentition witht premature exfoliation of some deciduous teeth and maxillary hypoplasia. This appliance, which is provided of a vestibular arm for correcting maxillary asymmetric transverse discrepancies, represents an interceptive treatment able to reduce the duration of the orthodontic therapy with fixed appliances. Case report In this case report the modified version of the Hyrax rapid palatal expander is described. The activation method, the therapeutic benefits as well as the clinical advantages are described.