Effect of micro-implant anchorage in the treatment of Angle Class II division 1 malocclusion

Objective To investigate the effect of micro-implant(MIA) anchorage in the treatment of Angle Class II Division 1 malocclusion. Methods 20 patients aged 18-29 years old(23.5 on average)in permanent dentition with Angle Class II Division 1(II1) malocclusion were selected. Then, they were randomly divided into two groups: Group A(using MIA): 10 patients(5 males, 5 females);Group B(using traditional anchorage:Nance arch and trans-palatal arch):10 patients(5 males, 5 females).Both groups had four 1st premolars extracted.MBT technique was used in the following orthodontic treatment. Finally we performed statistical analysis on the pre-treatment and post-treatment cephalograms in both groups. Results Both groups had favorable and markedly changes in the inclination and protrusion of upper incisors( p0.01).The using of MIA could retract upper anterior teeth at greater degree with little mesial movement in the upper molars.In group A,greater change in the labial soft tissues was found and facial aesthetics was obviously improved. Moreover, the mandibular plane and occlusal plane had little alterations( p0.05). Conclusion Compared with traditional anchorage, MIA has been proved to be more efficient in the treatment of Angle Class II1 malocclusion with shorter treatment time. It should be largely recommended in orthodontic clinic.