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Cyclic fatigue resistance and surface roughness of Rotary NiTi Instruments after Simulated Clinical Use in Curved Root Canals -- An Atomic Force Microscopy Study.
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  • RAKSHA BHAT,
  • ARJUN KINI,
  • PREETHESH SHETTY,
  • NIHAR SHETTY,
  • BAPANAIAH PENUGONDA
RAKSHA BHAT
AB Shetty Memorial Institute of Dental Sciences
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ARJUN KINI
New York University College of Dentistry
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PREETHESH SHETTY
Nitte University

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NIHAR SHETTY
AB Shetty Memorial Institute of Dental Sciences
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BAPANAIAH PENUGONDA
New York University College of Dentistry
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Abstract

Objectives: To examine the cyclic fatigue resistance and surface topography of TruNatomy (TN; Dentsply Sirona, Maillefer, Ballaiges, Switzerland) and ProTaper Gold (PTG, Dentsply Tulsa Dental Specialties, Tulsa, OK, USA) nickel-titanium rotary files and to evaluate the presence of alterations to the surface topography following instrumentation in simulated curved canals . Materials and Methods: Twenty-four nickel-titanium instruments; twelve each of TN and PTG file systems were tested for cyclic fatigue resistance. All the files were rotated in a simulated root canal with a standardized diameter, angle of curvature, and a radius of curvature of a specific cyclic fatigue testing device until fracture occurred. Time to fracture was recorded for each instrument in each group in seconds. The fractures instruments were subjected to atomic force microscopy analysis. Average roughness and root mean square values were chosen to investigate the surface features of endodontic files. The mean values and standard deviation were then calculated. Data was analyzed using Mann Whitney U test. Results: The Time taken to fracture was marginally higher in PTG instruments in comparison to the TN file systems. The PTG files exhibited higher surface roughness when compared with the TN files (p < 0.05). Conclusions: The TN file system had a higher cyclic fatigue resistance than PTG. The cyclic fatigue causing the file breakage did affect the surface topography of the files. The PTG files showed a higher level of surface porosity value than the TN files.