Efficacy of 810 nm Diode Laser Disinfection on Inflammatory Cytokines and Postoperative Pain After Endodontic Retreatment

810 nm diode laser (Elexxion clarosdental laser, Singen Deutschland, Germany) in a continuous wave mode with a power of 1.5 Watts in 4 cycles of 5 seconds with 20 seconds intervals in between each. A 200 μm fiber optic tip (Lite medics, Italy) will be inserted 1 mm from the working length, activated and moved in slow helical motion from the apex to the cervical third with alternating between clockwise and counterclockwise direction at speed of about 2 mm/s

Calcium hydroxide paste (MetaBiomed, Chungcheongbuk-do, Korea) will be placed inside the root canal and left for 1 week.