Patients who have severe crowding on the upper jaw that requires two first premolars extraction will be enrolled in this trial. The different types of brackets, such as self-ligating brackets and conventional brackets, and the various acceleration methods, such as corticotomy, have different effects on the orthodontic treatment time and the periodontal tissues. So, this study will assess and compare the overall leveling and aligning time and the changes in periodontal indices between patients with severe crowding, treating with self-ligating brackets associated with flapless corticotomy versus conventional brackets alone versus self-ligating brackets alone. There are three groups: The first group (control group): the patients in this group will be treated using conventional brackets alone. The second group (Experimental group): the patients in this group will be treated using self-ligating brackets alone. The third group (Experimental group): the patients in this group will be treated using self-ligating brackets associated with flapless corticotomy.
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Duration of teeth alignment
Timeframe: This will be measured immediately at the end of the alignment stage; this is expected to be within 180 to 200 days