RESUMEN
<p><b>OBJECTIVE</b>To investigate the effects of orthodontic treatment of skeletal crossbite adults with mandibular deviation.</p><p><b>METHODS</b>Eighteen skeletal Class III adult patients with borderline skeletal crossbite and mandibular deviation were selected (5 males, 13 females). The mean age was 25 years. All cases were treated with straight-wire appliance in upper arch and occlusal plate in the lower arch.Elastics were applied to correct mandibular deviation. Cephalometric analysis was carried out before and after treatment. Paired t-test was performed.</p><p><b>RESULTS</b>After treatment, the anterior crossbite was corrected and Class I molar and canine relationships were achieved. The inclination of upper incisors was increased significantly.</p><p><b>CONCLUSIONS</b>Straight-wire appliance combined with occlusal plate was effective on correcting adult patients with mild, moderate skeletal crossbite and mandibular deviation.</p>