Cyclic Fatigue Resistance and SEM Evaluation of Fractured Instrument Surfaces; Comparison of ProTaper Universal and ProTaper Gold Files

Authors : Nilgün BARUT, Emine ODABAŞI TEZER, Meltem ÖZTAN

Pages : 10-14

Doi:10.52037/eads.2022.0003

View : 31 | Download : 22

Publication Date : 2022-04-30

Article Type : Research Paper

Abstract :Purpose:To compare the cyclic fatigue resistance of ProTaper Universal insert ignore into journalissuearticles values(PTU); and ProTaper Gold insert ignore into journalissuearticles values(PTG); nickel titanium files at different angles and to examine the fractured surface areas by using scanning electron microscope insert ignore into journalissuearticles values(SEM);. Materials and Methods: A special static test device made of stainless steel with artificial canals at 3 different angles. The files were rotated until they were broken in artificial canals with 45°, 60° and 90° angles and also the time was recorded using a digital stopwatch. The number of cycles to failure was calculated for each instrument. Statistical analyzes were made by using one-way analysis of variance insert ignore into journalissuearticles values(Anova); for comparison between main groups. Results: PTG files showed higher fatigue resistance insert ignore into journalissuearticles values(p<0.001); than PTU files in all groups. SEM results displayed similar characteristic structures in pits and fissures caused by fracture due to cyclic fatigue regardless of angle and file type. Conclusion: Although surface properties of broken instruments do not play a decisive role in clinical practice it was observed that heat-treated Ni-Ti files exhibited higher fatigue resistance at all angles compared to conventional files according to the number of cycles during experimental period
Keywords : Cyclic fatigue, Fractured instrument, ProTaper Gold, ProTaper Universal, Scanning Electron Microscopy

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