Fig. 1From: Long-term antimicrobial assessment of orthodontic brackets coated with nitrogen-doped titanium dioxide against Streptococcus mutansColony count in the control group (normal stainless steel bracket) and test group (bracket coated with the N-doped TiO2). T0 (24 h), T1 (30 days), T2 (60 days), T3 (90 days)Back to article page