To assess in a laboratory setting the amount of apically extruded debris associated with different single-file nickel-titanium instrumentation systems compared to one multiple file rotary system.
Eighty human mandibular central incisors were randomly assigned to 4 groups (n=20 teeth per group). The root canals were instrumented according to the manufacturers’ instructions using the reciprocating single-file system Reciproc, the rotary single-file-systems F360 and OneShape and the multiple files rotary Mtwo instruments. The apically extruded debris was collected and dried in pre-weighed glass vials. The amount of debris was assessed with a micro balance and statistically analyzed using ANOVA and post-hoc Student-Newman-Keuls test. The time required to prepare the canals with the different instruments was also recorded.
Reciproc produced significantly more debris compared to all other systems (P<0 .05="" and="" between="" difference="" em="" file="" multiple="" no="" noted="" rotary="" significant="" single-file="" system="" systems="" the="" two="" was="">P0>
Under the condition of this study, all systems caused apical debris extrusion. Rotary instrumentation was associated with less debris extrusion compared to reciprocal instrumentation.