A Comparison of Time Needed for Instrumentation of Simulated Curved Canals by Using Different Files

Background : A more flexible file was needed for instrumentation of curved canals using step back enlargement technique Ni-Ti files has been shown to be exceptionally elastic , having a lower bending moment and lower permanent set after torsion with similar gauge stainless steel files .  Aim of the study: is to compare the time needed to prepare curved resin simulated root canals with Ni-Ti, S.S., and SS K-Flex files using a step –back enlargement technique.  Materials and methods: 30 simulated root canals were constructed using size 20 silver points as a mold, then divided into 3 groups: group 1: Canals instrumented with SS K – files, group 2: Canals instrumented with stainless steel K- flex files. And group 3: Canals instrumented with Ni – Ti files.  Results: The comparison between the three groups using ANOVA and T- test, showed a significant difference in time needed to fully instrument the canals.  CONCLUSION: Ni- Ti files required more time to instrument the canals than other files.