Photodynamic Therapy in Endodontic Treatment

1-visit-treatment (n=12): Chemomechanical preparation (CMP) - CMP was performed by using the single-file reciprocating technique + 2.5% NaOCL and 17% EDTA. Methylene blue was applied to root canals for 60 seconds and submitted to laser with a potency of 60 mW and energy density of 129 J/cm2 for 120 seconds after CMP

2-visit-treatment (n=12): Chemomechanical preparation (CMP) + Ca(OH)2 + SSL medication for 14-days + PDT. CMP was performed by using the single-file reciprocating technique + 2.5% NaOCL and 17% EDTA. Methylene blue was applied to root canals for 60 seconds and submitted to laser with a potency of 60 mW and energy density of 129 J/cm2 for 120 seconds after 14-days of intracanal medication