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

Year 2022, Volume: 49 Issue: 1, 10 - 14, 30.04.2022

Nilgün Barut , Emine Odabaşı Tezer , Meltem Öztan

https://doi.org/10.52037/eads.2022.0003

Abstract

Purpose:To compare the cyclic fatigue resistance of ProTaper Universal (PTU) and ProTaper Gold (PTG) nickel titanium files at different angles and to examine the fractured surface areas by using scanning electron microscope (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 (Anova) for comparison between main groups. Results: PTG files showed higher fatigue resistance (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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