Comparison of apical extrusion of Debris using two rotary(Race, Mtwo) systems

Abstract

Debris such as dentinal chips and necrotic tissue may be extruded into the periradicular tissue, which may lead to post operative pain and discomfort. Aims: The purpose of this study was to investigate the quantity of apical debris produced in vitro, using two rotary instrumentation techniques. Methods and Materials: Forty single-rooted premolars with a single canal were randomly divided into two groups of 20 teeth each. Each group was instrumented using one of the two instrumentation methods: crown-down technique with Race rotary nickel-titanium file or single-length technique with Mtwo rotary nickel- titanium file. Debris extruded through the apical foramen during instrumentation was collated on pre-weighed polyethylene vials, dried, and weighed by the two instrumentation techniques. The mean weight of extruded debris for each group was statistically analyzed by t-test. conclusion:. statistically t- test analyze showed that the means of apical debris extrusion in single length technique with Mtwo rotary nickel- titanium file (0.00610.00374) was significantly more than the crown down technique with Race rotary nickel- titanium file (0.00340.00218) (P<0.05).