OBJECTIVETo evaluate the effects and mechanisms of the microscrew implant anchorage (MIA) combined with multi-loop edgewise arch wire (MEAW) technique in the treatment of skeletal Class II adult patients.

METHODSEleven adult patients with skeletal Class II high-angle malocclusions were treated with fixed appliances. The spaces were closed by the springs from the MIA to the hook on the archwire. The height of the hook and the direction of the force were different according to the intrusion and retraction of upper anterior teeth. In the finishing stage, MEAW technique and modified class II elastics (from the first loop of MEAW to the MIA) were used for final detailing. Cephalometric analysis was used to evaluate the effect after treatment.

RESULTSAfter treatment, the decrease of SNA, ANB and FMA were (2.86 +/- 1.05) degrees , (2.82 +/- 0.96) degrees and (2.95 +/- 1.35) degrees , respectively. The torque control of upper anterior teeth was good. The protrusion of lower incisors and the molar extrusion were avoided. The upper molars were moved distally by (3.00 +/- 2.19) mm.

CONCLUSIONSThe treatment of adult patients with skeletal Class II high angle malocclusions with MIA and MEAW technique could not only improve the facial esthetics but also avoided the common side effects of traditional Class II elastics.