Antimicrobial Photodynamic Therapy in the Endodontic Treatment of Anterior Primary Teeth With Pulp Necrosis

This randomized controlled clinical trial evaluated the immediate reduction in intracanal microbial load and the short-term clinical and radiographic progression of anterior primary teeth with pulp necrosis after conventional endodontic treatment or antimicrobial photodynamic therapy (aPDT). Seven children aged 2 to 5 years contributed 20 eligible single-rooted anterior primary teeth. Teeth were randomized to conventional endodontic treatment (10 teeth) or aPDT (10 teeth). The primary outcome was intracanal microbial load before and immediately after the assigned first-session intervention. Clinical outcomes were assessed at 7 days, 1 month, and 3 months, and radiographic outcomes were assessed at 1 and 3 months.