a comparative study of treatment outcomes between begg and edgewise orthodontic systems in class i cases

background: the purpose of this study was to compare the occlusal peer assessment rating (par) index in class i patients treated by means of begg and edgewise methods. materials and methods: the pre- and post-treatment study models of class i patients, referred to two private clinics, treated with begg method (n = 30) and standard edgewise method (n = 30), were reviewed retrospectively using par index including dental displacements, buccal occlusion (anteroposterior, vertical and transverse), overjet, overbite and midline parameters. the changes in par indices were analyzed using paired t-test. a p < 0.05 was considered as statistically signifi cant. results: there was no signifi cant difference in sex and age distribution between the two groups. the improvement of buccal occlusion in patients treated by begg method (1.51 ± 0.39) was signifi cantly higher than that of patients treated by edgewise method (0.28 ± 0.39). the duration of treatment in begg method (17.8 ± 1.3 months) was signifi cantly shorter than that of edgewise method (23.7 ± 1.3 months). however, there were no signifi cant differences between the two methods in terms of total par index, dental displacements, overjet, overbite and midline. conclusion: in conclusion, fi ndings of the present study indicated that begg method might be associated with better improvement of buccal occlusion and shorter duration of treatment key words: begg, edgewise, peer assessment rating