IRCT20250831067058N1 IRCT 2026-04-18 Tehran University of Medical Sciences Evaluation the effect of low-power 980 nm laser on intrapulpal injection pain Evaluation the effect of low-power ۹۸۰ nm laser on intra pulpal injection pain in mandibular first and second molars with symptomatic irreversible pulpitis: A randomized, double-blind clinical trial study 2026-05-31 anticipated 56 Complete https://irct.ir/trial/85933 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Used, Assignment: Single, Purpose: Prevention, Randomization description: Randomization will be performed using random blocks of 4, using Excel software. The randomization process will be performed by the study epidemiology consultant. To perform this process, the type of intervention assigned will be written in numerical order in sealed envelopes and, in the order of patient referral, the envelopes are opened at the time of treatment and the type of intervention is determined, Blinding description: The study will be double-blind, so that neither the patient nor the person performing the pain assessment will be aware of the technique being used. 0 (exploratory trials) Irreversible pulpitis. Intervention 1: Control group: Laser sham (placebo) + intrapulpal injection: In this group, the laser will be used in the off mode. Intervention 2: Intervention group: Low-power laser irradiation with a wavelength of 980 nm (300 J/cm2) with a power of 100 milliwatts and a 400 micrometer fiber, for 30 seconds, then intrapulpal injection will be performed immediately after laser irradiation. 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