IRCT20200208046415N1 IRCT 2020-04-06 Babol University of Medical Sciences The effect of Low Level Laser Irradiation on rate of relapse of mandibular incisors Evaluation of Low Level Laser Irradiation on rate of relapse of mandibular incisors after fixed orthodontic treatment by extraction 2019-10-12 anticipated 20 Complete https://irct.ir/trial/46453 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Patients are randomly assigned to two treatment groups using the randomized block method and the free site www.randomization.com will be used to generate the allocation sequence. The obtained sequence will be written on separate sheets and placed in sealed envelopes and will be given to the principal investigator for the study, Blinding description: The outcome measurer is different from whom that cures patients. N/A Orthodontic relapse. Intervention 1: Intervention group: Patients undergoing orthodontic treatment during the dental relapse period are randomly exposed to GaAlAs laser irradiation. The laser probe will be positioned in contact with gingival tissue in the coronal third of the root, and the irradiation will be performed on 4 points around the tooth, including mesiobuccal, distobuccal, mesiolingual, and distolingual areas. The low-level laser irradiation will be performed thrice a week for 4 weeks. Intervention 2: Control group: Orthodontic treatment alone (no intervention to minimize relapse will be performed.). Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is No more information.