Fig. 6
Antibacterial effect of Ag+–Zn2+ against E. faecalis biofilms grown on dentin slices. a OD curve within the first 10 h of immersion of dentin slices treated with the different gels for 7 days. b Comparisons of the optical density values of each group at the 10th h. c Comparisons of the optical density values of each group at the 10th h after exclusion of the blank control group. [Asterisk: significant difference when compared with the blank control group (p < 0.05); ▲significant difference when compared with the Zn2+ only group (p < 0.05); #significant difference when compared with the Ag+ only group (p < 0.05); ■significant difference when compared with 2% chlorhexidine (p < 0.05)]