M Soltani
B Saedi
Z Mohammadi

Statement of the problem: The aim of this study was to compare the treatment outcome of CL I malocclusion patients treated by two methods, including Standard Edgewise and MBT. Materials and Methods: Thirty subjects (۲۳ boys and ۷ girls) with an age range between ۱۴‒۱۹ years were included in each group. The patients had Cl I malocclusion and were treated through Non-Ext strategy. Pre- and post-treatment records were assessed using the grading system of the American Board of Orthodontics (ABO). Eight parameters were measured three times and the mean of the three measurements was recorded. Finally, the score of each parameter as well as total score of all parameters (ABO score) were compared between groups by t-test. Results: Improvement in ABO score between the two groups did not show significant differences. However, in details of post-treatment occlusion, such as buccolingual inclination, there was a significant difference between groups (P=۰.۰۱۴). Conclusion: Efficiency of two methods was favorable and post-treatment ABO score in both groups had improved significantly relative to pre-treatment. There were differences between the two groups in establishment of details of occlusion.