160592.fig.006a
(a)
160592.fig.006b
(b)
Figure 6: (a) The effect of kaurenoic acid (KA) on biofilm formation on resin tooth surfaces. Streptococcus mutans biofilms on resin tooth surfaces were incubated in various concentrations of KA. Biofilm formation was inhibited by treatment with 3 μg/mL and completely inhibited at 4 μg/mL KA. (b) Scanning electron microscopy image of S. mutans biofilm formation on resin tooth surfaces. NaF was used as a positive control. The scale bar represents 25 μm.