Abstract
The aim of this study is a) to monitor the microbial load (CFU/mL) and the endotoxin levels (UE/mL) at the beginning, during the retreatment and before the root filling procedure in teeth with secondary endodontic infection performed in single and multiplevisitendodontic retreatment; b) to relate endotoxin levels (UE/mL) and microbial load(CFU/ mL) with the presence of clinical signs and …