A Comparison of Apical Root Resorption in Incisors after Fixed Orthodontic Treatment with Standard Edgewise and Straight Wire (MBT) Method

Statement of problem: one of the major outcomes of orthodontic treatment is the apicalroot resorption of teeth moved during the treatment. identifying the possible risk factors,are necessary for every orthodontist.purpose: the aim of this study was to compare the rate of apical root resorption afterfixed orthodontic treatment with standard edgewise and straight wire (mbt) method,and also to evaluate other factors effecting the rate of root resorption in orthodontictreatments.materials and method: in this study, parallel periapical radiographs of 127 patientsimaging a total of 737 individual teeth, were collected. a total of 76 patients weretreated by standard edgewise and 51 patients by straight wire method. the periapicalradiographs were scanned and then the percentage of root resorption was calculated byphotoshop software. the data were analyzed by paired-samples t-test and the generalizedlinear model adopting the spss 15.0.results: in patients treated with straight wire method (mbt), mean root resorption was 18.26% compared to 14.82% in patients treated with standard edgewise technique (p< .05). male patients had higher rate of root resorption,statistically significant (p< .05).age at onset of treatment, duration of treatment, type of dental occlusion, premolar extractions and the use of intermaxillary elastics had no significant effect on the root resorption in this study.conclusion: having more root resorption in the straight wire method and less in the standard edgewise technique can be attributed to more root movement in pre-adjusted mbt technique due to the brackets employed in this method.