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Alveolar bone levels before (day 0) and 60 days after (day 60) ligation in each group. a,b,c,dValues with different superscript letters were significantly different on the same day (p = 0.000). *Significantly decreased compared to day 0 in the same group (p < 0.05). ABL: alveolar bone level, SF: negative control, WL: wire ligature, SL: silk ligature, SWL: silk-wire twisted ligature.
