Quantitative Assessment of the Efficacy of Sweeps Laser Activation Systems

The SWEEPS fiber tip (25 µs ultra-short dual pulse mode-Auto SWEEPS mode) was inserted into the Er:YAG laser source (2,940 nm, 20 mJ per pulse, 15 Hz, 0.3 W power, and 50 µs pulse frequency). 3% NaOCl solution was activated in three periods of 20 s. Then, the same procedure was repeated with 2 ml of 17% EDTA solution.

The irrigation solution was used by adapting an ultrasonic tip (IRRI S 21/25; VDW, Munich, Germany) to an ultrasonic device (VDW Ultra; VDW, Munich, Germany). The tip was activated a total of three times, with each cycle lasting 20 s and involving the use of 1 ml of 3% NaOCl. Then, 2 ml of 17% EDTA solution was activated for 1 min as describe above. The ultrasonic tip was placed 2 mm behind the working length without touching the canal walls.