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IRCT20180312039060N4 IRCT 2020-11-28 Islamic Azad University Effect of laser therapy on level of jaw’s movement after orthognathic surgery Effect of660nm low level laser therapy on level of jaw’s lateral movement after orthognathic surgery 2020-12-09 anticipated 12 Complete https://irct.ir/trial/52535 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive, Randomization description: Samples were numbered from 1 to 12. Randomization was performed with the help of true random generator software at random.org. In this way, in the software, a minimum of 1 and a maximum of 12 were assumed. Then 6 distinct and non-duplicate numbers were taken from the software and the numbers were classified in the first group and other samples in the second group, Blinding description: In 12 patients, 6 of them are on the right side for laser treatment and the left side is off. In the remaining 6 patients, the left side is off for laser treatment and the right side is off. 3 Trismus and the amount of lateral movements of the jaw. Intervention 1: Intervention group: 12 patients are randomly divided into two groups of 6, in the first group laser treatment is performed on the right side of the face and in the second group on the left side for laser treatment. Intervention 2: Control group: In the first group, the left side of the mouth will be used as a control, and the laser will be pretended to shine while it is off. In the second group, this action will be done on the right side of the mouth. Yes - There is a plan to make this available What will be shared: all data When: after paper published To whom: all person Conditions: no situation Where to obtain: alireza sadigh 09143083724 How to obtain: 1 day Comments:

public Alireza Sadighi

Esfahan - East Gey Street - Arghavanieh-Ethics committee of Islamic Azad University Isfahan (Khorasgan) Branch-

Esfahan Iran (Islamic Republic of) ۸۱۵۵۱۳۹۹۹۸ +98 31 3535 4053 arsadighi@gmail.com Esfahan University of Medical Sciences scientific Alireza Sadighi

Esfahan - East Gey Street - Arghavanieh-Ethics committee of Islamic Azad University Isfahan (Khorasgan) Branch-

Esfahan Iran (Islamic Republic of) ۸۱۵۵۱۳۹۹۹۸ +98 31 3535 4053 arsadighi@gmail.com Esfahan University of Medical Sciences Iran (Islamic Republic of) Absence of systemic diseases No smoking Do not take drugs that affect healing Patients' surgery is performed by a surgeon. Absence of systemic diseases, use of drugs effective in wound healing No history of seizures Pregnancy thyroid tumors Malignant oral tumors for laser treatment Do not have asymmetric disease Age range 18-40 years 18 years 40 years Both The patient's unwillingness to cooperate in the study Infection after surgery Sensitivity or allergies In case of unwanted accidents during the operation, such as bad fracture If you need genioplasty with bimax operation (two jaws) S02 Fracture of skull and facial bones Rehabilitation Rehabilitation Intervention group: 12 patients are randomly divided into two groups of 6, in the first group laser treatment is performed on the right side of the face and in the second group on the left side for laser treatment. Control group: In the first group, the left side of the mouth will be used as a control, and the laser will be pretended to shine while it is off. In the second group, this action will be done on the right side of the mouth Trismus. Timepoint: Immediately after surgery, two days later, four days later and one week after surgery. Method of measurement: Using a ruler, the maximum opening of the patient's mouth is recorded and compared in the stated time periods. The amount of lateral movements of the jaw. Timepoint: Immediately after surgery, two days later, four days later and one week after surgery. Method of measurement: To evaluate postoperative trismus in patients, two days and seven days after surgery, we measure the lateral movements of the jaw to the right and the lateral movements of the left jaw to mm, and the deviation of the jaw when opening the mouth on the second, seventh days. And the fourteenth is measured. Islamic Azad University Approved 2019-03-12 Ethics committee of Islamic Azad University Isfahan (Khorasgan) Branch Esfahan - East Gey Street - Arghavanieh-Ethics committee of Islamic Azad University Isfahan (Khorasgan) Branch- Khorasgan Isfehan Iran (Islamic Republic of)