الفهرس 
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Abstract
”Objective : The purpose of this study was to evaluate the early treatment effects of the modified bionator with J-hook on growing patients with skeletal Class II division 1 malocclusion. Materials and Methods: This investigation was conducted on 12 patients. All the patients had the following criteria: Skeletal Class II division 1 due to mandibular retrusion with maxillary excess. Age ranged from 8-12 (mixed dentition and early permanent dentition). ANB° was more than 6°. Overjet was more than 5 mm. The modified bionator with J-hook was designed to restrict the downward and forward growth of the maxilla. Lateral cephalometric radiographs, photographs and study casts were obtained before and after treatment to assess the dento-skeletal and soft tissue changes for the treated patients.
Results: The appliance had dento-skeletal and soft tissue effects, which were established by the following significant changes: stimulation of the forward growth of the mandible, improvement of the maxillo-mandibular relationship, slight increase in the anterior facial height, decreased the overjet, restriction of the forward and downward growth of the maxilla and improvement in the soft tissue profile. Conclusion : The modified bionator with J-hook was an effective appliance in the treatment of growing patients with class II division 1 malocclusion due to mandibular retrusion with maxillary excess. The appliance had skeletal effects in the sagittal plane by restricting maxillary growth and stimulating the forward growth of the mandible. The overjet was reduced due to the increased forward growth of the mandible and palatal tipping of upper incisors. The appliance improved the vertical dimension of the face and the facial profile.