Zygomatic mini-implant for Class II correction in growing patients.

OBJECTIVE

The correction of some Angle Class II malocclusions requires distalization of the upper first molars via an induced orthopedic effect. In the present study, we tested the potential of using a mini-implant to achieve a modified zygomatic anchorage system for Class II correction.

MATERIALS AND METHODS

Our study comprised 10 treated and 10 control Class II growing female subjects aged 10-12 years. Orthodontic mini-implants were placed in the zygomatic buttress to act as anchorage for the distalization. The follow-up period was 6 months; treatment changes were assessed by cone beam CT scans.

RESULTS

Compared to the control group, the treatment group showed significant retrusion of point A, anti-clockwise rotation of the maxillary plane, and a mean molar distalization of 2.92 ± 0.69 mm with no extrusion, no tipping or buccal rolling. There was significant upper incisor intrusion (1.89 ± 0.84 mm) with no changes in incisor inclination. No change in the mandibular plane angle was detected.

CONCLUSION

Use of this technique allowed Class II correction with concomitant reduction in the visible gingiva in the treated subjects without the adverse effects experienced with other appliances.