Fig. 2From: Clinical evaluation of ultrasonic subgingival debridement versus ultrasonic subgingival scaling combined with manual root planing in the treatment of periodontitis: study protocol for a randomized controlled trialThe schedule of enrollment, intervention and assessments. Abbreviations: PLI plaque index, PD probing depth, CAL clinical attachment loss, BI bleeding index, FI furcation involvement, VAS Visual Analogue Scale/ScoreBack to article page