Clinical research of treatment of Class II malocclusion with Headgear-activator

Objective It is to research the effects of Treatment of Class Ⅱ malocclusion with Headgear-activator.Methods 13 cases of Class Ⅱ Division Ⅰ malocclusion with mandibular retrognathism in the mixed dentition or early permanent dentition were treated with Headgear-activator,and the effects were evaluated with cephalometric analysis before and after treatment.Results Maxillary growth was inhibited by Headgear-activator, especially in vertical direction.Mandibular retrognathism was improved significantly in horizontal direction.Meanwhile,the upper incisors were retruded and intruded.All patients' molars were adjusted into centric occlusion;normal overjet and overbite were obtained.Soft tissue appearance and profile were improved greatly.Conclusion Headgear-activator is effective for treating early Class Ⅱ Division Ⅰ malocclusion with mandibular retrognathism.