Evaluation of filling material remnants after basic preparation, apical enlargement and final irrigation in retreatment of severely curved root canals in extracted teeth.

Aim: To compare the retreatment ability of several rotary and reciprocating file systems in curved root canals of extracted teeth and to evaluate the influence of additional apical enlargement performed after a basic retreatment on the amount of remaining filling material.

Methodology: A total of 65 round curved root canals were used. The root canals were prepared with the ProTaper Next rotary system to size 25, .

Comparison of final disinfection protocols using antimicrobial photodynamic therapy and different irrigants after single-file reciprocating instrumentation against intracanal bacterial biofilm - An in vitro study.

Background: The aim of the study was to compare the efficacy of antimicrobial photodynamic therapy (aPDT) with irrigation protocols that include sodium hypochlorite (NaOCl), ethylenediaminotetraacetic acid (EDTA) or QMiX (combined irrigant: EDTA, chlorhexidine, detergent) solution after single-file reciprocating root canal instrumentation.

Methods: The study sample included 68 extracted mandibular human single canal teeth. The canals were inoculated with bacterial suspension made of wild strain of Enterococcus faecalis.