Introduction

postoperative pain, pain
SYMPTOMATIC APICAL PERIODONTITIS
The control of postoperative pain is a golden target with miscellaneous tactics to achieve as it is a frequent sequalae after endodontic treatment and is accredited to either mechanical, chemical, or microbial aspects [Laser therapy has been employed in dentistry widely since its development by Maiman in 1960 [LLLT reacts with cells through light, a phenomenon called photo-biomodulation [Laser-activated irrigation (LAI) generate optical cavitation in the irrigant, causing the formation of vapor bubbles [As no comparison was found in literatures between these laser applications, this randomized controlled trial study aims to compare two different methods for low-level laser application: LLLT and LAI in terms of post-endodontic pain control in patients with symptomatic apical periodontitis undergoing primary root canal treatment. The null hypothesis assumes that there is no significant difference in postoperative pain after root canal treatment using LAI or LLLT.