Clinical study of improved Activator on the treatment of Angle class II malocclusion in mixed dentition

Objective To evaluate the treatment effects of improved activator on patients with Angle Class Ⅱ malocclusion in mixed dentition.Methods According to criteria of the study,six patients with Angle Class Ⅱ malocclusion in mixed dentition were selected and treated with improved Activator.Cephalometric analysis was performed before and after treatment.Results 1)Angle ANB was improved;2)After treatment,overjet and molar relationship was improved;3)Ten wearing hours was needed for treatment everyday;4)The treatment duration was(5.3±1.4) months.Conclusions Improved Activator could be used for both Angle Class ⅡDivision 1 malocclusion and Division 2 malocclusion.