Abstract :
Aim: To asses the cyclic fatigue fracture resistance of engine-driven Revo-S instruments used by dental students, residents and endodontists.
Methodology: A total of 90 Revo-S instruments size 25, 0.08 taper used by students (n=30), residents (n=30) and endodontists (n=30) were tested. Each group was divided into 3 subgroups (n=10) to be tested in simulated canals with 60o, 45o and 90o angles of curvature and a 3 mm radius at a continious speed of 350 rpm and 0.8 nm torque until they were fractured. The time of fracture for each instrument was recorded. The data was associated using one-way analysis of variance followed by Tukey’s Honestly Significant Difference test.
Results: The instruments used by undergraduate students resulted in a significantly longer cyclic fatigue life (P < 0>
Conclusions: Many usage of number 25, 0.08 taper Revo-S files should be avoided in graduate or specialist clinics rather than undergraduate clinic.
Keyword :
Undergraduate, Dental student, Cyclic fatique, Revo-S, Experience, Fracture.