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 .
Rotary Mtwo system versus manual K-file instruments: efficacy in preparing primary and permanent molar root canals.
AIM To compare the cleaning ability and preparation time of rotary instruments ( Mtwo ) and conventional manual instruments ( K-file ) in preparing primary and permanent molar root canals . MATERIAL S AND METHODS Access cavities were prepared in 70 primary and 70 permanent teeth and  India ink was injected into 120 canals of selected molars . The teeth were r and omly divided into two main subgroups ( n=20 ) and three control groups ( n=10 ) . In each of these main subgroups , either the manual instrument ( K-file ) or the rotary system ( Mtwo ) was used to prepare root canals . After cleaning the canals and clearing the teeth , dye removal was evaluated with the help of a stereomicroscope . In addition , the time needed for root canal preparation was recorded by a chronometer . STATISTICAL ANALYSIS Statistical analyses were done using the Kruskal-Wallis , Mann-Whitney and t tests . RESULTS With regard to the cleaning ability of root canals , there were no significant differences between the K-file and Mtwo rotary system in primary and permanent teeth in the apical , middle or coronal third of the canals . Moreover , there were no significant differences between primary and permanent teeth prepared with K-files and rotary instruments . In all the groups , shorter times were recorded with the rotary technique . The working time was shorter in primary than in permanent teeth . CONCLUSION The Mtwo rotary system showed acceptable cleaning ability in both primary and permanent teeth , and achieved results similar to those of K-files in less time
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 .