Assessment of various endodontic instrumentation systems on the amount of apically extruded bacteria - An study.

Aim: The objective of this study was to assess the effect of different endodontic instrumentation systems on the amount of apically extruded bacteria.

Materials And Methods: One hundred and twenty freshly extracted human mandibular premolars with single canal were collected. Endodontic access cavities were prepared and then contaminated with an suspension (ATCC 29212).