Comparison of the treatment of Angle classIIdivision 1 malocclusion in female adults with micro-implant ancho-rage and headgear anchorage technique

Objective To evaluate the efficacy of female adults treated with micro-implant anchorage(MIA) and headgear anchorage(HGA),both combined with straight wire appliance,in the treatment of class Ⅱ division 1 malocclusion patients.Methods The study was performed on 20 selected female adults making use of straight wire appliance with MIA or with HGA.The cephalometric indices were examined before and after treatment using Pancherz analysis method.Results After treatment,there were no significant difference between two groups,such as the position of the maxillary,and the slightly forward movement of the mandible.The maxillary first molars in MIA group were moved forward(1.91±0.69) mm,and in the HGA group moved forward(2.38±1.08) mm,there were no significant difference(P0.05).In the vertical direction,in the MIA group the maxillary first molars were intruded(0.70±0.71) mm,while in the HGA group the maxillary first molars were extruded(0.88±0.74) mm.These differences had statistical significance(P0.001).In MIA group the lower anterior face height reduced(1.13±0.93)mm,but in the HGA group increased(0.37±1.93) mm(P0.05).At the same time,in HGA group mandibular plane angle increased(2.18±1.74)°,while in the MIA group mandibular plane angle reduced(1.51±2.76)°(P0.01).The incisors in two groups were retracted and intruded,and these differences had no statistical significance(P0.05).Conclusion Both methods can achieve satisfactory results.Micro-implant anchorage is more effective in controlling the vertical movement of upper molar.