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Bacterial vitality and biofilm thickness of biofilms formed on resin composite incorporating QPEI nanoparticles and nonmodified resin composite. Biofilms were stained using the BacLight LIVE/DEAD viability stain and scanned using a confocal laser scanning microscope. Average cross-section enumeration of viable and nonviable bacteria, as measured by Image ProPlus softwear of biofilms formed on resin composite (A) and resin composite with incorporated QPEI nanoparticles (B).
