Fig. 8From: The antibacterial effect of silver, zinc-oxide and combination of silver/ zinc oxide nanoparticles coating of orthodontic brackets (an in vitro study)Petri dishes of S. mutans of the 4 groups, T1: immediately after coating and T2: post 3 months test (1 = control group, 2 = Ag coated group, 3 = ZnO coated group and 4 = Ag/ZnO coated group)Back to article page