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a A probing depth (PD) of 7 mm was recorded at baseline. b Prior to mechanical instrumentation the NaOCl gel was applied in the periodontal pocket for 30 s. c Subgingival debridement was performed using an ultrasonic scaler with a thin tip. d A gently root planning was made by means of Gracey micro-curette. e A probing depth of 3 mm was recorded at 6 months post-therapy
