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[Cephalometric analysis of influence of the Frankel-2 appliance in the treatment of distal malocclusion].

AIM
To analyze the effect of the Frankel-2 activator on the sagital maxillomandibular ratio during the treatment of distal malocclusion.


MATERIAL AND METHODS
51 patients with skeletal distal malocclusion were examined. 24 patients belong to the main group treated with Frankel-2 activator, and 27 belong to the control group that did not receive treatment. Patients age 10-14, the duration of treatment was 1.5-2 years. To estimate changes of the maxillomandibular ratio in patients before and after treatment, in the control group were analyzed lateral cephalometric X-rays with interval of two years.


RESULTS
The growth of the maxilla (ANS-PNS) in the main group was less than in the control group. The SNA angle showed similar changes in both groups. Co-Gn distance indexes were also close in both groups. In the SNB angle, the jaw in the main group was moved forward. The angle of ANB and the size of WITS in the control group are not changed, and in the main group were decreased and normalized. In contradistinction to the control group, in the main group in the upper incisors occurred retrusion and this affects the upper lip. The overjet distance in the control group was not changed, while in the main group decreased and normalized.


CONCLUSION
During the treatment of distal malocclusion by the Frankel-2 activator there is a delay in the growth of the maxilla in the saggital direction, movement of the mandibula forward, and improvement in the sagittal ratio between the maxilla and the mandibula.