Document Classification

Section Type: METHODS

Text: Subsequently they were divided into four groups : in group A, 29 teeth were irrigated with 2 mL of 10 % citric acid solution ; in group B, 29 teeth were irrigated with 2 mL 5. 25 % sodium hypochlorite (NaOCl) solution ; in group C, 29 teeth were irradiated with 810-nm laser energy via a 200-microm optic fiber at 2. 5 W power in pulsed mode (10 msec on and 10 msec off) for 5 sec ; and in group D, 29 teeth were irrigated with NaOCl, irradiated with the laser, then irrigated with citric acid, and irradiated with the laser, followed again by NaOCl irrigation and laser irradiation.