Conclusions The results of this systematic review suggested that NiTi rotary instruments were associated with lower canal transportation and apical extrusion when compared to SST h and files , whereas both groups had similar outcomes in terms of success of therapy , amount of residual bacteria , and cleansing ability after treatment .
Introduction This systematic review evaluated the effectiveness of  nickel‐titanium ( NiTi ) rotary files compared to stainless‐steel ( SST ) h and files .
Apical extrusion of intracanal debris and irrigant following use of various instrumentation techniques.
OBJECTIVE The purpose of this study was to compare in vitro the amount of debris and irrigant extruded apically from extracted teeth , using manual technique and crowndown pressureless technique by K3 , RaCe , and FlexMaster instruments . STUDY DESIGN Sixty human single-rooted m and ibular premolar teeth were r and omly assigned to 4 groups , 15 teeth each . The teeth in 4 groups were instrumented until the working length with RaCe , K3 , FlexMaster , and K-type stainless steel instruments respectively .  Debris and irrigant extruded from the apical foramen were collected into vials and the amounts were determined . The data obtained were analyzed using Kruskal-Wallis 1-way analysis of variance and Mann-Whitney U tests , with alpha = 0.05 as the level for statistical significance . RESULTS No statistically significant difference was observed among the groups in terms of debris extrusion ( P > .05 ) . On the other h and , a statistically significant difference was observed between K3 and manual technique groups in terms of irrigant extrusion ( P < .05 ) . The difference between other groups was not statistically significant ( P > .05 ) . CONCLUSION Based on the results , all instrumentation techniques produced extruded debris and irrigant ; however , the engine-driven nickel-titanium systems were associated with less apical extrusion and irrigant
Conclusions The results of this systematic review suggested that NiTi rotary instruments were associated with lower canal transportation and apical extrusion when compared to SST h and files , whereas both groups had similar outcomes in terms of success of therapy , amount of residual bacteria , and cleansing ability after treatment .
Introduction This systematic review evaluated the effectiveness of  nickel‐titanium ( NiTi ) rotary files compared to stainless‐steel ( SST ) h and files .