A comparison of amounts of apically extruded debris using two rotary (Bio race, Mtwo) and handling step-back (K file) instrumentation techniques

Abstract

Dentinal debris and necrotic tissues might extrude from apical foramen into periapical tissues which is responsible for post-operative pain and other complications. Aim: This study aimed to evaluate the amount of debris extrusion by two hand and rotary instrumentation techniques in vitro. Methods and Materials: Sixty single-canal human premolar teeth were divided into three experimental groups randomly. In each group one of the instrumentation techniques was utilized (BioRaCe NiTi rotary instrumentation with step-back technique, Mtwo NiTi rotary by single length technique, and K-file hand instrumentation with step-back technique). The extruded debris from apical foramen during instrumentation were collected in poly ethylene tubes which were weighed before beginning of instrumentation. The extruded debris were dried and weighed again. The weight difference of vials before and after instrumentation was measured. The collected data was analyzed using one-way(ANOWA) analysis of variance. The P<0.05 was considered statistically significant at this study. Results: The mean debris extruded by BioRaCe, K-file , and Mtwo was 1.061.2, 1.15 0.7, and 0.58 0.3, respectively. Mtwo rotary files extruded the least debris from apex; however there was not any significant difference between experimental groups (P>0.05). Conclusions: All instrumentation techniques cause debris extrusion from root apex.