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(a). The measurements of modified plaque index in 12-, 24-month and the difference between baseline (b). The measurements of modified gingival index in 12-, 24-month and the difference between baseline (c). The measurements of probing depth in 12-, 24-month and the difference between baseline (d). The measurements of marginal bone loss in 12-, 24-month and the difference between baseline (M, month).
