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Cell survival fraction of S. aureus biofilm in 3D gingival model after incubated with F-2 chitosan hydrogel for 30 min subjected varies dose of light illumination on two sides. After PDI, S. aureus biofilm was maintained in F-2 for 0.5 h (A) and 2 h (B) followed by plate count. Each value is the mean of three independent experiments ± standard deviation. * p < 0.05.
