Evaluation of the amount of apically extruded debris using Mtwo and RaCe systems – An in vitro study

Abstract

Extrusion of debris into the periradicular tissue during endodontic treatment is one of the main causes of postoperative flare-ups. The aim of this study was to compare the amount of apically extruded debris using Mtwo instruments with single length technique and RaCe system using crown-down approach. 40 extracted mandibular premolar were included in this study. The teeth were decoronated to establish a length of 15 mm. The roots were placed through the holes cut in the lids of glass vials. The vials were weighed and the teeth were randomly assigned into two experimental groups of 20 teeth each. In the first group, the canals were prepared using RaCe rotary in a crown-down fashion. While in the second group, the canals were instrumented using Mtwo rotary with single length technique. After the instrumentation, the vials were heated to drive off all the moisture. The glass vials were weighed again, and the weight of extruded debris was calculated. Student t-test was used to compare the debris extrusion of experimental groups. The results show that both instruments tested produced a considerable debris extrusion. However, the Mtwo system with single length technique produced significantly more debris extrusion than RaCe system with crown-down technique.

Key words: Apical extrusion, debris extrusion, Mtwo system, RaCe system.