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.
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.
Authors: Zuleyha Mirzen Arat; Hakan Türkkahraman; Jeryl D English; Ronald L Gallerano; Jim C Boley Journal: Angle Orthod Date: 2010-07 Impact factor: 2.079