Abstract
BackgroundThe purpose of the current study was to inspect and compare the influence of applying continuous rotation and reciprocation motions on the cyclic fatigue resistance of Protaper Next (PTN) file (X2) and WaveOne Gold (WOG) Primary file in simulated canals. Twenty Protaper Next files(X2) and 20 WaveOne Gold Primary files were included in this study. A cyclic fatigue testing device was employed to test the cyclic resistance of each file in different motions. The testing device has an artificial custom-made stainless-steel canal with a 60° angle of curvature and a 2-mm radius of curvature. The files were randomly divided into 4 groups; group 1: PTN in continuous rotation, group 2: PTN in reciprocation, group 3: WOG in continuous rotation and group 4: WOG in reciprocation. All the instruments were rotated until fracture occurred, and the time to fracture was recorded in seconds using a digital chronometer. The number of cycles to fracture (NCF) was calculated. The data were analyzed statistically (p < .05).ResultsResults represented that when using either continuous rotation motion or reciprocating motion, WOG files showed a significantly longer time until failure than PTN files (p < 0.001). The time till fracture increased significantly, when using both types of files with a reciprocating filing motion.ConclusionWithin the confinement of this study, WOG file in reciprocation showed higher cyclic fatigue resistance than PTN in both continuous rotation and reciprocating motion. The reciprocating motion enhances both files behavior in terms of cyclic fatigue resistance.
Highlights
The purpose of the current study was to inspect and compare the influence of applying continuous rotation and reciprocation motions on the cyclic fatigue resistance of Protaper (PTN) file (X2) and WaveOne Gold (WOG) Primary file in simulated canals
Separation of rotary instruments during root canal preparation is considered a critical mishap as the separated segment may hinder the irrigant from entering the canal system that may prevent adequate microorganism eradication (Haapasalo et al 2003)
The present study investigated and compared the cyclic fatigue resistances of the Protaper Next (PTN) and WOG Nickel titanium (NiTi) rotary systems in rotation and reciprocation motions in simulated canal with a 60° angle of curvature
Summary
The purpose of the current study was to inspect and compare the influence of applying continuous rotation and reciprocation motions on the cyclic fatigue resistance of Protaper (PTN) file (X2) and WaveOne Gold (WOG) Primary file in simulated canals. Unexpected instrument fracture may occur during root canal shaping. Rotary NiTi files show two types of failure modes: torsional failure and cyclic fatigue failure. Cyclic fatigue occurs when part of the file is bound to dentin while subjected to cycles of compression/tension strain in the area of maximum root canal curvature (Sattapan et al 2000; Parashos and Messer 2006). Cyclic fatigue is considered the principal cause of NiTi instrument separation especially in canals with acute-angles and short radius of curvature (Pruett et al 1997)
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