Resistance to torsional failure and cyclic fatigue resistance of ProTaper Next, WaveOne, and Mtwo files in continuous and reciprocating motion: An in vitro study

Varghese, N O; Pillai, Rajesh; Sujathen, U-Nu; Sainudeen, Shan; Antony, Abe; Paul, Sinju

doi:10.4103/0972-0707.181937

Cited by 30 publications

(10 citation statements)

References 24 publications

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“…According to the NCF results, cyclic fatigue resistance significantly improved on WaveOne and Reciproc by reciprocating motion, which concurs with previous studies [ 28 – 30 ]. The reciprocating motion consisted of repeated combinations of counterclockwise and clockwise rotation.…”

Section: Discussionsupporting

confidence: 91%

Mechanical and Metallurgical Properties of Various Nickel-Titanium Rotary Instruments

Shim¹,

Kum

et al. 2017

BioMed Research International

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The aim of this study was to investigate the effect of thermomechanical treatment on mechanical and metallurgical properties of nickel-titanium (NiTi) rotary instruments. Eight kinds of NiTi rotary instruments with sizes of ISO #25 were selected: ProFile, K3, and One Shape for the conventional alloy; ProTaper NEXT, Reciproc, and WaveOne for the M-wire alloy; HyFlex CM for the controlled memory- (CM-) wire; and TF for the R-phase alloy. Torsional fracture and cyclic fatigue fracture tests were performed. Products underwent a differential scanning calorimetry (DSC) analysis. The CM-wire and R-phase groups had the lowest elastic modulus, followed by the M-wire group. The maximum torque of the M-wire instrument was comparable to that of a conventional instrument, while those of the CM-wire and R-phase instruments were lower. The angular displacement at failure (ADF) for the CM-wire and R-phase instruments was higher than that of conventional instruments, and ADF of the M-wire instruments was lower. The cyclic fatigue resistance of the thermomechanically treated NiTi instruments was higher. DSC plots revealed that NiTi instruments made with the conventional alloy were primarily composed of austenite at room temperature; stable martensite and R-phase were found in thermomechanically treated instruments.

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Section: Discussionsupporting

confidence: 91%

Mechanical and Metallurgical Properties of Various Nickel-Titanium Rotary Instruments

Shim¹,

Kum

et al. 2017

BioMed Research International

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“…The instrument does not bind in the canal, but it rotates freely in a curvature, generating tension/compression cycles at the point of maximum flexure until the fracture occurs. [ 19 ]…”

Section: Discussionmentioning

confidence: 99%

A comparative evaluation of cyclic fatigue resistance of FlexiCON (Edge Endo) files in rotary versus reciprocating motion at various curvatures – An in vitro study

et al. 2019

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Aim: The aim of the study to compare the cyclic fatigue resistance of FlexiCON (Edge Endo) files in rotary versus reciprocating motion in coronal, middle, and apical curvature of the simulated artificial canal. Materials and Methods: A total number of 36 new files, 25 mm length of ISO size 25 at the tip and a taper of 0.06, were used for the study and divided into two groups of 18 files each. Group I: FlexiCON X 3 , was used in a rotary motion and Group II: FlexiCON X 1 was used in a reciprocating motion. Cyclic fatigue testing was conducted in a custom-made device that allowed for a reproducible simulation of a curved canal. The canal system, which comprised two adjustable stainless steel blocks, had a 60° angle of curvature and 3 mm width. The groups were further divided into three subgroups with six files in each, representing apical curvature (Group Ia/IIa), middle curvature (Group Ib/IIb), and Coronal curvature (Group Ic/IIc). Using X-Smart plus motor, files were used in rotary and reciprocating mode and the number of cycles to failure was recorded. Statistical Analysis: Data were analyzed using ANOVA and Post hoc followed by Dunnett's test and unpaired t -test using Statistical Package for the Social Sciences 16 version. Results: FlexiCON X1 reciprocating files showed the maximum cyclic fatigue resistance at coronal curvature (1936.50 ± 1.09) followed by middle (1514.50 ± 1.07) and apical curvature (1487.50 ± 6.75), while FlexiCON X3 rotary files showed the maximum cyclic fatigue at the middle curvature (1106.00 ± 4.21), followed by coronal (920.00 ± 1.16) and apical curvature (757.00 ± 5.34). The statistical analysis revealed a statistically significant difference ( P = 0.001) between the two groups. Conclusion: FlexiCON X1 reciprocating files showed better cyclic fatigue resistance at coronal, middle, and apical curvature compared to FlexiCON X3 rotary files.

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“… 1 Reciprocating rotation increases the cyclic fatigue resistance of NiTi files, compared to continuous rotation. 2 , 3 WaveOne Gold (Dentsply Maillefer, Ballaigues, Switzerland) and Reciproc Blue (VDW GmbH, Munich, Germany) are recently released reciprocating files manufactured with heat treatment. For WaveOne Gold, heat treatment of the NiTi alloy involves a slow heating-cooling process, which generates Ti 3 Ni 4 precipitates dispersed over the surface, 4 and provides greater resistance to cyclic fatigue than M-wire reciprocating files.…”

Section: Introductionmentioning

confidence: 99%

Bending resistance and cyclic fatigue resistance of WaveOne Gold, Reciproc Blue, and HyFlex EDM instruments

Kum

Kim

et al. 2020

Journal of Dental Sciences

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Background/purpose Several single-file systems manufactured using different heat treatment and operated by different kinematics have been released. This study compared the bending resistance and cyclic fatigue resistance of three NiTi files, and examined their phase-transformation behavior. Materials and methods WaveOne Gold Primary (WOG), Reciproc Blue R25 (RPB), and HyFlex EDM OneFile (HDM) were tested (N = 40/instrument). A vertical load was applied to a point 3 mm from the tip, and the stress was measured until a displacement of 3 mm. Tests were conducted at either room temperature (RT: 22 °C) or body temperature (BT: 37 °C) (n = 10). Cyclic fatigue resistance tests were performed in an artificial canal, which had a curvature angle of 40° and a 5-mm radius. Tests were conducted at either RT or BT (n = 10). Instruments were operated according to the manufacturers' instructions. Test results were analyzed using the Kruskal–Wallis and the Mann–Whitney tests. Additional three instruments of each brand were subjected to differential scanning calorimetry (DSC). Results At RT the bending resistance of three files were not significantly different. However, at BT the bending resistance of RPB was highest, followed by WOG, and HDM ( P < 0.05). At RT, RPB demonstrated the longest fracture time, followed by HDM, and WOG ( P < 0.05). At BT, HDM had the longest fracture time, followed by RPB, and WOG ( P < 0.05). The WOG, RPB consisted of austenite in a considerable proportion, whereas HDM was mainly martensite state at BT. Conclusion HDM presented superior flexibility and cyclic fatigue resistance at BT.

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Resistance to torsional failure and cyclic fatigue resistance of ProTaper Next, WaveOne, and Mtwo files in continuous and reciprocating motion: An in vitro study

Cited by 30 publications

References 24 publications

Mechanical and Metallurgical Properties of Various Nickel-Titanium Rotary Instruments

Mechanical and Metallurgical Properties of Various Nickel-Titanium Rotary Instruments

A comparative evaluation of cyclic fatigue resistance of FlexiCON (Edge Endo) files in rotary versus reciprocating motion at various curvatures – An in vitro study

Bending resistance and cyclic fatigue resistance of WaveOne Gold, Reciproc Blue, and HyFlex EDM instruments

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