IRCT20190513043579N1 IRCT 2019-06-09 Tehran University of Medical Sciences Evaluation of the effect of low level laser on sensory disturbances after mandibular orthognatic surgery Evaluation of the effect of photobiomodulation on neurosensory disturbances after sagittal osteotomy of mandible 2018-06-01 anticipated 40 Complete https://irct.ir/trial/39545 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Random numbers were generated through computerized block randomization using SPSS software version 23, Blinding description: Patients and doctor who evaluated neurosensory recovery were blinded to the side of laser radiation. 3 neurosensory disorder. Laser irradiation was applied with a GaAs diode laser (Wiser; Doctor Smile–Lambda Spa, Brendola, Vicenza, Italy) (980 nm wavelength, power of 100 mW, and the energy density of 12 J/cm2). Laser irradiation was maintained within a 0.5 cm2 area. Laser energy was used for 60 sec in each visit.Unilateral extraoral LLL therapy was done one day before the surgery and then on the days 1, 3, 7, 14, 21, and 28 after the surgery. One side of the mandible was considered as the intervention side and the other side was considered as the control side. In the control side, laser probe with a red light was put on the considered area, but device was not activated, so that the patients were blinded to the side radiated by laser. In chin area, radiation was done on 6 points on each side from vermilion border to the lower border vertically and from midline to oral commissure horizontally. Then, radiation was appleid on 6 points in buccal region from oral commissure to lingula with a gentle pressure of laser probe.. 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