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

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 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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Comparison of the cyclic fatigue resistance of ProGlider, PathGlider and One G path-finding instruments

Journal of Dental Research Dental Clinics Dental Prospects ◽

10.15171/joddd.2019.009 ◽

2019 ◽

Vol 13 (1) ◽

pp. 57-60

Author(s):

Damla Özsu Kırıcı ◽

Ertuğrul Karataş ◽

Ahmet Demirhan Uygun ◽

Ezgi Doğanay Yıldız ◽

Kezban Meltem Çolak ◽

...

Keyword(s):

Stainless Steel ◽

Fatigue Test ◽

Fatigue Resistance ◽

Root Canal ◽

Cyclic Fatigue ◽

Nickel Titanium ◽

Curvature Radius ◽

System A ◽

Post Hoc ◽

G 14

Background. The aim of the present study was to compare the cyclic fatigue resistance of novel nickel titanium rotary pathfinding instruments. Methods. Twenty instruments were selected for each file system. A simulated stainless steel root canal, with a 90° angle of curvature and a curvature radius of 3 mm, was used for cyclic fatigue test of the ProGlider (#16, progressive taper: 0.02‒ 0.085), PathGlider (#15, taper: .03), and One G (#14, taper: .03) instruments. Statistical analyses were performed with oneway ANOVA (P=0.05). Post hoc Tukey tests were used to determine any statistically significant differences between the groups. Results. The ProGlider instruments exhibited significantly more cyclic fatigue resistance than both PathGlider and One G instruments (P<0.001). One G instruments had significantly more resistance to fracture than PathGlider instruments (P<0.05). Conclusion. ProGlider instruments had better cyclic fatigue resistance than PathGlider and One G instruments.

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Influence of Different Heat Treatments on Torsional and Cyclic Fatigue Resistance of Nickel–Titanium Rotary Files: A Comparative Study

Applied Sciences ◽

10.3390/app10165604 ◽

2020 ◽

Vol 10 (16) ◽

pp. 5604 ◽

Cited By ~ 2

Author(s):

Gianluca Gambarini ◽

Andrea Cicconetti ◽

Dario Di Nardo ◽

Gabriele Miccoli ◽

Alessio Zanza ◽

...

Keyword(s):

Heat Treatment ◽

Fatigue Resistance ◽

Cyclic Fatigue ◽

Sem Analysis ◽

Nickel Titanium ◽

Torsional Resistance ◽

Heat Treated ◽

Torsional Test ◽

Time To Fracture ◽

Flexural Resistance

Protaper Universal (PTU), Protaper Gold (PTG) (Maillefer, Ballaigues, CH), EdgeTaper (ET), and EdgeTaper Platinum (ETP) (Albuquerque, NM, USA) were tested for both torsional and flexural resistance. The aim of the present study was to evaluate the influence of proprietary heat treatment on the metallurgical properties of the aforementioned instruments. Four groups of 30 different instruments (size 20.07) were tested, then divided into two subgroups of 15 instruments—one for the cyclic fatigue test in a curved canal (90°—2 mm radius) at 300 rpm and 2.5 Ncm. The time to fracture (TtF) and fragment length (FL) were recorded. The other subgroup was subjected to the torsional test (300 rpm, 5.5 Ncm). The torque to fracture and TtF were recorded. All the instruments underwent a SEM analysis. The heat-treated instruments showed a significantly higher fatigue resistance than the non-heat-treated instruments (p < 0.05). No significant differences were found in the torsional resistance between the ET and PTU, and the ETP and PTG. However, when comparing all the groups, the heat-treated instruments showed less torsional resistance. The improvement from heat treatment was mainly found in the cyclic fatigue resistance.

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Assessment of the role of cross section on fatigue resistance of rotary files when used in reciprocation

European Journal of Dentistry ◽

10.4103/1305-7456.195171 ◽

2016 ◽

Vol 10 (04) ◽

pp. 541-545 ◽

Cited By ~ 2

Author(s):

Vadhana Sekar ◽

Ranjith Kumar ◽

Suresh Nandini ◽

Suma Ballal ◽

Natanasabapathy Velmurugan

Keyword(s):

Cross Section ◽

Fatigue Resistance ◽

Fatigue Testing ◽

Dynamic Testing ◽

Cyclic Fatigue ◽

Reciprocating Motion ◽

Continuous Rotation ◽

Significant Difference ◽

Post Hoc

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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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 Resistance of Nickel-titanium Rotary Instruments according to the Angle of File Access and Radius of Root Canal

Journal of Endodontics ◽

10.1016/j.joen.2019.11.015 ◽

2020 ◽

Vol 46 (3) ◽

pp. 431-436 ◽

Cited By ~ 7

Author(s):

Eugenio Pedullà ◽

Giusy Rita Maria La Rosa ◽

Chiara Virgillito ◽

Ernesto Rapisarda ◽

Hyeon-Cheol Kim ◽

...

Keyword(s):

Fatigue Resistance ◽

Root Canal ◽

Cyclic Fatigue ◽

Nickel Titanium ◽

File Access ◽

Rotary Instruments

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Effect of Cryogenic Treatment on Cyclic Fatigue of Nickel-titanium Rotary Files

10.21203/rs.3.rs-743019/v1 ◽

2021 ◽

Author(s):

Hamed Karkehabadi ◽

Abbas Farmani ◽

Zahra Pakseresht ◽

Faraz Sedaghat ◽

Saber Yavari Niya

Keyword(s):

Fatigue Resistance ◽

Room Temperature ◽

Cryogenic Treatment ◽

Cyclic Fatigue ◽

Nickel Titanium ◽

Warm Up ◽

Gutta Percha ◽

The Mean ◽

Time To Fracture

Abstract Objective: This study sought to assess the effect of cryogenic treatment on cyclic fatigue of Neoniti and Reciproc nickel-titanium (NiTi) rotary files. This in vitro, experimental study was performed on 48 Neoniti and Reciproc NiTi rotary files (#25, 6% taper) in two subgroups with and without cryogenic treatment. The files in cryogenic subgroups were stored in liquid nitrogen chamber at -196°C for 24 h. Next, they were placed at room temperature (25°C) to gradually warm up. Stainless steel (SS) blocks were used to standardize the degree of rotation of the files. The SS blocks simulated a root canal with the negative pattern of gutta-percha with 0.08 taper, #25 tip size, and 45° canal curvature. Each endodontic file was rotated in this canal until fracture. The time until fracture was recorded by a digital chronometer. Time to fracture was used to calculate the number of rotations before file fracture as the cyclic fatigue scale. Results: The mean cyclic fatigue resistance of both Neoniti and Reciproc rotary files in cryogenic subgroups was significantly higher than that in non-cryogenic control subgroups (P<0.05). Cryogenic treatment can significantly increase the cyclic fatigue resistance of Neoniti and Reciproc NiTi rotary files.

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Shaping Ability, Cyclic Fatigue Resistance and Fractographic Analysis of Hybrid and Reciprocating Nickel Titanium Endodontic Instruments

Metals ◽

10.3390/met10020172 ◽

2020 ◽

Vol 10 (2) ◽

pp. 172 ◽

Cited By ~ 1

Author(s):

Saulius Drukteinis ◽

Vytaute Peciuliene ◽

Ruta Bendinskaite ◽

Vilma Brukiene ◽

Rasmute Maneliene ◽

...

Keyword(s):

Fatigue Resistance ◽

Root Canal ◽

Cyclic Fatigue ◽

Nickel Titanium ◽

Significance Level ◽

Root Canals ◽

Working Length ◽

Before And After ◽

Canal Transportation ◽

Shaping Ability

The aim of this study was to investigate the shaping ability and cyclic fatigue resistance of Genius (GN) and WaveOne (WO) nickel-titanium (NiTi) instruments. Forty mesial root canals of mandibular molars were randomly divided into two groups, according to the instrument system used for root canal preparation (n = 20): GN and WO. Root canals were prepared to the full working length using the crown-down technique, with up to 40.04 instruments for GN group and 40.08 instruments for WO group. Specimens were scanned with a µCT before and after instrumentation. The changes in 3D parameters and degree of canal transportation were evaluated in the apical, middle and coronal thirds of root canals. Size 25, taper 0.04 (GN) and 0.08 (WO) instruments (n = 20) were used in simulated root canals until fracturing, and the number of cycles to failure (NCF) was recorded. The fractured files were investigated under a scanning electron microscope to characterize fractured surfaces. Data were analyzed using ANOVA post hoc Tuckey’s tests with the significance level set at 5%. The GN system was able to prepare the higher percentage of the canal surface with less canal transportation in all root canal thirds and displayed the higher resistance to cyclic fatigue in comparison to WO instruments (p < 0.05). However, the length of the fractured segments was not significantly different among the groups; meanwhile, SEM investigations revealed the typical topographic characteristics of fractured surfaces. Hybrid GN instruments demonstrated superior shaping ability and resistance to cyclic fatigue. However, both NiTi instrument systems prepared the root canals with no significant shaping errors, considerable changes in 3D parameters and no significant differences in the topographic appearances of the instrument surfaces after fractures.

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