Fabrication and Antibacterial Performance of Graded Nano–Composite Biomaterials - Biomaterials Science and Engineering - page 108

Fig. 9. Graded materials with a linear graded distribution (a) before and (b) after culturing
streptococcus mutans .
As shown in Figure 9(a), before culturing streptococcus mutans , the graded compositional
profiles vary in a linear distribution and match the designed composition. After cultured on
the graded materials, the streptococcus mutans shows a reverse distribution to that of
tourmaline (Figure 9(b)). To further investigate the effect of tourmaline on streptococcus
mutans , the bacteria were exposed to 10, 30, 70, 100, 150, and 200 mg/ml of tourmaline
culture. Figure 10 shows the effect of tourmaline on the growth of streptococcus mutans .