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Scores on operational assessment. A Group V-J and J-V exhibited lower subjective score compared with the score for V-J and J-V groups (P < 0.05). B Group J-V showed the best performance on the scaling effect compared with group V (P < 0.01) and J (P < 0.01). C/D Scaling as indicated by periodontal plaque indicator. E/F Corresponding scoring standard using Quigley-Hein index
