الفهرس 
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Abstract
The aim if this study was to: Compare the antibacterial efficacy
of chitosan nano-particles (CNPs) irrigation when used passively and
when activated using PUI to sodium hypochlorite irrigation when used
passively and when activated using PUI, on Enterococcus faecalis
biofilm reduction at 3 different depths in the infected dentinal tubules
using Confocal Laser Scanning Microscope (CLSM).