[Comparison of lower incisor positions after treatment and in postretention period, in Cl. I cases treated with Begg and Edgewise techniques].

The lower incisor positions have an important role in obtaining optimum occlusion and esthetics with orthodontic therapy. The aim of this study is to evaluate in longterm, the lower incisor positions of class I anterior crowding cases which were treated with Begg and Edge wise techniques. For this purpose lateral cephalometric radiographs of 20 Edge wise and 11 Begg cases which were treated by extraction of the four first bicuspids are evaluated. In all the cases T to NB (mm) T to NB (angle) and IMPA parameters examined before treatment, just after active therapy and in an average of 5 years postretention period. In cases which were treated with Begg mechanics, statistically important improvement is found in IMPA values after treatment. Lower incisors were stable in postretention period and there were no statistically significant differences when we compared the "after treatment" and "postretention" incisor positions in both treatment groups.