KMID : 1034420190440020019
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Restorative Dentistry & Endodontics 2019 Volume.44 No. 2 p.19 ~ p.19
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Cyclic fatigue, bending resistance, and surface roughness of ProTaper Gold and EdgeEvolve files in canals with single- and double-curvature
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Khalil Wafaa A.
Natto Zuhair S.
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Abstract
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Objectives: The purpose of this study was to evaluate the cyclic fatigue, bending resistance, and surface roughness of EdgeEvolve (EdgeEndo) and ProTaper Gold (Dentsply Tulsa Dental Specialties) nickel-titanium (NiTi) rotary files.
Materials and Methods: The instruments (n = 15/each) were tested for cyclic fatigue in single- (60¡Æ curvature, 5-mm radius) and double-curved (coronal curvature 60¡Æ, 5-mm radius, and apical curvature of 30¡Æ and 2-mm radius) artificial canals. The number of cycles to fracture was calculated. The bending resistance of both files were tested using a universal testing machine where the files were bent until reach 45¡Æ. Scanning electron microscopy and x-ray energy-dispersive spectrometric analysis were used for imaging the fractured segments, while the atomic force microscope was used to quantify the surface roughness average (Ra).
Results: EdgeEvolve files exhibited higher cyclic fatigue resistance than ProTaper Gold files in single- and double-curved canals (p < 0.05) and both files were more resistant to cyclic fatigue in single-curved canals than double-curved canals (p < 0.05). EdgeEvolve files exhibited significantly more flexibility than did ProTaper Gold files (p < 0.05). Both files had approximately similar Ni and Ti contents (p > 0.05). EdgeEvolve files showed significantly lower Ra values than ProTaper Gold files (p < 0.05).
Conclusions: Within the limitation of this study, EdgeEvolve files exhibited significantly higher cyclic fatigue resistance than ProTaper Gold files in both single- and double-curved canals.
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KEYWORD
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Cyclic fatigue test, EdgeEvolve, Nickel titanium rotary instrument, ProTaper Gold, Scanning electron microscopy, Universal testing machine
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