Dentin inhibits the antibacterial effect of new and conventional endodontic irrigants.

Introduction: This in vitro study aimed to compare the antibacterial effect of a new irrigant, QMiX, with that of conventional irrigation solutions in the presence or absence of dentin powder.

Methods: Dentin powder was prepared from bovine incisors and sterilized. The following irrigants were tested against Enterococcus faecalis (ATCC 29212): 6% sodium hypochlorite (NaOCl), 1% NaOCl, QMiX, 2% chlorhexidine gluconate (CHX), and 17% EDTA.