IRCT138904134278N2 IRCT 2010-10-17 Faculty of Dentistry, Tehran University of Medical Sciences The effect of low power Laser on pain and trismus after third Molar surgery. LPL, LTM Effect of low power Laser on reduction pain and trismus after third Molar. 2009-05-01 anticipated 40 Complete https://irct.ir/trial/4539 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Parallel, Purpose: Supportive. N/A Trismus. Intervention 1: Intervention group: patients in LLLT group had their operation side, treated with an 810 nm, infrared laser irradiation, intraorally 1 cm from the target tissue 10 min after surgery. Intervention 2: Control group: Received routine recommendation. In the placebo group the handpiece was inserted into the operative side intraorally but laser was not activated.