Intraoral Molar Distalization with Intraosseous Mini Screw

The aim of the present study was to evaluate the effects of the miniscrew-supported, modified Hyrax appliance on bilateral distaliza-tion of posterior teeth. A 15-year-old girl with Class II malocclusion (end-to-end molar relationships, space deficiency for maxillary ca-nine) underwent orthodontic treatment. The patient rejected tooth extraction. Then, she was treated with the miniscrew-supported, modified Hyrax appliance. An activation of 1 mm per month was planned. Lateral cephalometric views were used to evaluate distal movement. Distalization was successfully achieved at 4 months. No anchorage loss and incisor protrusion were noted. It would be beneficial to choose this appliance for the distalization of maxillary molars in patients with maxillary incisor protrusion, as this appli-ance does not cause anchorage loss in the upper jaw.