Fig. 2From: Efficacy evaluation of a cordless ultrasonic unit in achieving reduction of bacterial load within a root canal system as compared to a conventional ultrasonic unit and negative pressure irrigationNegative control. Upon completion of instrumentation, NaOCl was inactivated with 5% sodium thiosulfate for 5 min followed by irrigation with 5 mL of 17% EDTA for 1 min to ensure the complete removal of smear layerBack to article page