The present study investigate the effects of the Open Bite Bionator in the treatment of anterior open bite patients. The sample was comprised of 11 growing patients with average age of 8 -11years and a treatment period of 18 months. T1 were taken before and T2 after appliance removal. The statistical evaluation indicated significant overbite increase, increase of posterior facial height, increase in mandible ramus, increase upper incisor angle and decrease lower incisor angle. This results of this investigation permits to conclude that the open bite bionator appliance is efficient in the treatment of anterior open treatment in growing patients.