Cyclic Fatigue Resistance of RaCe and Mtwo Rotary Files in Continuous Rotation and Reciprocating Motion

ABSTRACT Objective: The purpose of this study was to assess the role of cross section on cyclic fatigue resistance of One Shape, Revo-S SU, and Mtwo rotary files in continuous rotation and reciprocating motion in dynamic testing model. Materials and Methods: A total of 90 new rotary One Shape, Revo-S SU, and Mtwo files (ISO size 25, taper 0.06, length 25 mm) were subjected to continuous rotation or reciprocating motion. A cyclic fatigue testing device was fabricated with 60° angle of curvature and 5 mm radius. The dynamic testing of these files was performed using an electric motor which permitted the reproduction of pecking motion. All instruments were rotated or reciprocated until fracture occurred. The time taken for each instrument to fracture was recorded. All the fractured files were analyzed under a scanning electron microscope (SEM) to detect the mode of fracture. Statistical analysis was performed using one-way ANOVA, followed by Tukey's honestly significant difference post hoc test. Results: The time taken for instruments in reciprocating motion to fail under cyclic loading was significantly longer when compared with groups in continuous rotary motion. There was a statistically significant difference between Mtwo rotary and the other two groups in both continuous and reciprocating motion. One Shape rotary files recorded significantly longer duration to fracture resistance when compared with Revo-S SU files in both continuous and reciprocating motion. SEM observations showed that the instruments of all groups had undergone a ductile mode of fracture. Conclusion: Reciprocating motion improved the cyclic fatigue resistance of all tested groups.

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Cyclic Fatigue Resistance of K3, K3XF, and Twisted File Nickel-Titanium Files under Continuous Rotation or Reciprocating Motion

Journal of Endodontics ◽

10.1016/j.joen.2013.07.020 ◽

2013 ◽

Vol 39 (12) ◽

pp. 1585-1588 ◽

Cited By ~ 47

Author(s):

Juan José Pérez-Higueras ◽

Ana Arias ◽

José C. de la Macorra

Keyword(s):

Fatigue Resistance ◽

Cyclic Fatigue ◽

Nickel Titanium ◽

Reciprocating Motion ◽

Continuous Rotation

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Assessment of cyclic fatigue resistance of Protaper Next and WaveOne Gold in different kinematics

Bulletin of the National Research Centre ◽

10.1186/s42269-020-00421-w ◽

2020 ◽

Vol 44 (1) ◽

Author(s):

Amira Galal Ismail ◽

Manar Galal ◽

Nehal Nabil Roshdy

Keyword(s):

Fatigue Resistance ◽

Fatigue Testing ◽

Cyclic Fatigue ◽

Rotation Group ◽

Radius Of Curvature ◽

Testing Device ◽

Reciprocating Motion ◽

Continuous Rotation ◽

Custom Made ◽

Rotation Motion

Abstract Background 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 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). Results Results 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. Conclusion Within 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.

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Cyclic fatigue resistance of VDW.ROTATE and Reciproc Blue nickel-titanium files at root canal temperature

Journal of Dental Research Dental Clinics Dental Prospects ◽

10.34172/joddd.2020.032 ◽

2020 ◽

Vol 14 (3) ◽

pp. 177-180

Author(s):

Ahmet Demirhan Uygun

Keyword(s):

Fatigue Resistance ◽

Root Canal ◽

Cyclic Fatigue ◽

Nickel Titanium ◽

Reciprocating Motion ◽

Motion Group ◽

Continuous Rotation ◽

Time To Fracture ◽

Motion Groups ◽

Rotation Motion

Background. This study aimed to compare the VDW.ROTATE instruments with the Reciproc Blue instruments in different kinematics in terms of the cyclic fatigue resistance. Methods. Sixty instruments, 40 VDW.ROTATE and 20 Reciproc Blue instruments, were divided into three groups (n=20): VDW.ROTATE was used in both continuous rotation and reciprocation, and Reciproc Blue was used in reciprocation only. The cyclic fatigue resistance test was carried out in an artificial canal (60°, r=3 mm) at an intracanal temperature of 35±2°C until fracture, and the time to fracture was recorded in seconds. The data were analyzed statistically using Kruskal–Wallis and Tamhane’s T2 tests (P<0.05). Results. DAll the reciprocating motion groups resulted in a longer mean duration to failure than the continuous rotation motion group (P<0.05). Conclusion. It was observed that the Reciproc Blue instruments had higher cyclic fatigue resistance than VDW.ROTATE instruments (P<0.05). Recent studies have shown that reciprocal movement increases cyclic fatigue resistance compared to rotational movement. The VDW.ROTATE instrument, which has a similar size, design, and alloy as the Reciproc Blue instrument, can also be used by clinicians in reciprocating motion with endo motors capable of reciprocating in different directions. However, even if the cyclic fatigue resistance increases by using VDW.ROTATE instruments in reciprocation, the cyclic fatigue resistance is lower than Reciproc Blue instruments.

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Cyclic fatigue resistance of different continuous rotation and reciprocating endodontic systems

Indian Journal of Dental Research ◽

10.4103/0970-9290.186244 ◽

2016 ◽

Vol 27 (3) ◽

pp. 278 ◽

Cited By ~ 5

Author(s):

Fabio de Almeida-Gomes ◽

RodrigoFerreira Lopes Arrais Nunes ◽

ArielMoura Arrais ◽

Claudio Ferreira-Maniglia ◽

Marcelo de Morais Vitoriano ◽

...

Keyword(s):

Fatigue Resistance ◽

Cyclic Fatigue ◽

Continuous Rotation

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Evaluation of cyclic fatigue resistance of modern Nickel–Titanium rotary instruments with continuous rotation

Giornale Italiano di Endodonzia ◽

10.1016/j.gien.2017.09.002 ◽

2017 ◽

Vol 31 (2) ◽

pp. 78-82 ◽

Cited By ~ 1

Author(s):

Massimo Amato ◽

Giuseppe Pantaleo ◽

Dina Abdellatif ◽

Andrea Blasi ◽

Roberto Lo Giudice ◽

...

Keyword(s):

Fatigue Resistance ◽

Cyclic Fatigue ◽

Nickel Titanium ◽

Rotary Instruments ◽

Continuous Rotation

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Cyclic Fatigue Comparison of TruNatomy, Twisted File, and ProTaper Next Rotary Systems

International Journal of Dentistry ◽

10.1155/2020/3190938 ◽

2020 ◽

Vol 2020 ◽

pp. 1-4

Author(s):

Abdullah Mahmoud Riyahi ◽

Amr Bashiri ◽

Khalid Alshahrani ◽

Saad Alshahrani ◽

Hadi M. Alamri ◽

...

Keyword(s):

Standard Deviation ◽

Fatigue Resistance ◽

Fatigue Testing ◽

Clinical Performance ◽

Cyclic Fatigue ◽

Tooth Structure ◽

Multiple Comparison Test ◽

Continuous Rotation ◽

Number Of Cycles ◽

Cycles To Failure

TruNatomy (TN; Dentsply Sirona, Maillefer, Ballaigues, Switzerland) is a newly released system that was not tested in any previous studies. The objective of this work is to evaluate cyclic fatigue resistance of the new file and compare it with the Twisted Files (TF) and ProTaper Next (PTN). Forty-five files were distributed into 3 groups: PTN X2 (size 25 and taper 0.06), TF (size 25 and taper 0.06), and TN prime file (size 26 and taper 0.04). Each group included 15 files. Lengths of all files were 25 mm. Cyclic fatigue testing was done using artificial stainless-steel canals with 60-degree curvature and 5 mm radius. Continuous rotation movement at 300 rpm was used until the file fractures. Time for file separation was recorded in seconds. The number of cycles to failure (NCF) mean and standard deviation for each group was calculated. For statistical analysis of data, ANOVA and Tukey’s multiple comparison test were used. Mean and standard deviation (SD) of NCF were 259 ± 37.2, 521.67 ± 63.07 and 846.67 ± 37.16 for PTN, TF, and TN respectively. TN on average had significantly the highest NCF compared with PTN (p<0.05) and TF (p<0.05). TruNatomy file showed superior cyclic fatigue resistance. With its potential to preserve tooth structure, this file offers a good cyclic fatigue advantage. However, future studies are required to evaluate other properties of this file and to examine its clinical performance.

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