Objective To evaluate the extraoral bow headgear traction on the correction of moderate to high degree of crowding associated with the clinical efficacy of high angle Methods 18 cases of severe crowding dentition in patients with high-angle， high application of headgear traction strengthen teeth extraoral arch anchorage， and a high degree of control teeth， the tooth extraction with fixed appliance Results 18 patients were aligned dentition， face has been maintained or have a good improvement in molar and canine relations have reached a neutral， maintain or reduce the mandibular plane Conclusion headgear extraoral bow of moderate to severe crowding in high angle cases with the treatment of teeth can play a high degree of control and strengthen the role of molar (maybe)
[ Abstract ] Objective To evaluate the head cap extraoral arch high traction in the treatment of severe dentition crowding with high angle cases clinical curative Methods 18 cases of severe dentition crowding with high angle patients， application of headgear traction enhancing extraoral arch high molar anchorage molar height， and control， combined with fixed appliance for orthodontic Results 18 cases of patients with aligning， face get to keep or improve， molar and canine relationship reached the neutral， maintained or reduced mandibular plane Conclusion head cap extraoral arch in moderate to severe congestion with high angle cases treatment can rise to control molar height and strengthen the role of molar [ Key words ] head cap extraoral arch crowding high angle
