Cyclic fatigue resistance of three rotary file systems in a dynamic model after immersion in sodium hypochlorite

Abstract Aim: The aim of this study was to evaluate the apical transportation, centering ability and cyclic fatigue resistance of Hero shaper, Twisted file, Hyflex file and RACE rotary file systems. Methods: Mesiobuccal roots of eighty maxillary molars were divided into four groups and instrumented with Hero shaper, Twisted file, Hyflex file and RACE rotary file systems with a final apical size being 25/.04. Apical deviation was assessed by the radiographic platform method that enables obtaining superimposed images of the first and last instrument used in root canal preparation in the same radiograph. Apical transportation was measured in millimeters with the aid of the AUTOCAD 2008 software. Forty canals were sectioned at 7mm from the apex and stereomicroscopic Images were taken at 6x magnification before and after instrumentation for evaluation of centering ability. The cyclic fatigue testing was conducted with the instrumentrotating freely at angles of curvature of 45 degree. Total 10 instruments were tested in each group. The instruments were rotated at 400rpm using the X-smart motor (Dentsply, Maillefer) until fracture occurred. Results: There was no statistically significant difference between the four groups in apical transportation and centering ability whereas twisted files showed the maximum cyclic fatigue resistance. Conclusion: The different rotary file systems provided minimum canal transportation and the twisted file performed significantly better in terms of cyclic fatigue resistance.

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Effect of immersion in sodium hypochlorite on the cyclic fatigue resistance of three rotary instruments

Journal of Conservative Dentistry ◽

10.4103/jcd.jcd_117_19 ◽

2020 ◽

Vol 23 (6) ◽

pp. 554

Author(s):

AnaGrasiela Da Silva Limoeiro ◽

Daiane Nogueira ◽

CarlosEduardo Da Silveira Bueno ◽

AugustoShoji Kato ◽

AlexandreSigrist De Martin ◽

...

Keyword(s):

Fatigue Resistance ◽

Sodium Hypochlorite ◽

Cyclic Fatigue ◽

Rotary Instruments

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Effect of Temperature of Sodium Hypochlorite on Cyclic Fatigue Resistance of Heat-treated Reciprocating Files

Journal of Endodontics ◽

10.1016/j.joen.2018.11.003 ◽

2019 ◽

Vol 45 (2) ◽

pp. 205-208 ◽

Cited By ~ 2

Author(s):

Ahmet Keles ◽

Emel Uzunoglu Ozyurek ◽

Mehmet Ozgur Uyanik ◽

Emre Nagas

Keyword(s):

Fatigue Resistance ◽

Sodium Hypochlorite ◽

Cyclic Fatigue ◽

Effect Of Temperature ◽

Heat Treated

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Cyclic Fatigue Resistance Of Three Niti Single-File Systems After Immersion In EDTA

Dentistry ◽

10.4172/2161-1122.1000184 ◽

2013 ◽

Vol 04 (01) ◽

Author(s):

Claudio Poggio

Keyword(s):

Fatigue Resistance ◽

File Systems ◽

Cyclic Fatigue ◽

Single File

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Evaluation of Cyclic Fatigue of Hyflex EDM, Twisted Files, and ProTaper Gold Manufactured with Different Processes: An In Vitro Study

International Journal of Dentistry ◽

10.1155/2021/7402658 ◽

2021 ◽

Vol 2021 ◽

pp. 1-6

Author(s):

Pooja D. Khandagale ◽

Prashant P. Shetty ◽

Saleem D. Makandar ◽

Pradeep A. Bapna ◽

Mohmed Isaqali Karobari ◽

...

Keyword(s):

Fatigue Resistance ◽

Root Canal ◽

File Systems ◽

In Vitro Study ◽

Cyclic Fatigue ◽

Segment Length ◽

Significant Difference ◽

Number Of Cycles ◽

Post Hoc

Introduction. The main aims of root canal instrumentation are to provide an environment that will lead to healing and to provide a root canal shape that is comfortable to clean and seal. When working with rotary endodontic instruments, the most significant concerns are that the instrument might fracture in the root canal, thus affecting the treatment outcome. Hence, it is of immense importance to know which file systems have more cyclic fatigue resistance. Methodology. This study evaluated the effect of the curved segment length of the artificial canal (the arch), and the number of cycles necessary in fracture of Hyflex EDM, Twisted files, and ProTaper Gold were recorded. Sixty NiTi rotary instruments of 25 mm length (Hyflex EDM (20), Twisted files (20), and ProTaper Gold (20)) were tested in a metal block with simulated canal having 90° angle of curvature. The study was performed with a specific radius and degree of curvature, i.e., 8 mm radius and 90⁰ angle of curvature, and data obtained were subsequently subjected to statistical evaluation using one-way analysis of variance and Tukey’s post hoc test. Result. The Hyflex EDM (774.29) exhibited the maximum cyclic fatigue resistance compared to Twisted files (654.875) and ProTaper Gold (375.575). A statistically significant difference was observed between the tested groups. Conclusion. The Hyflex EDM files showed the highest cyclic fatigue resistance, followed by Twisted files and ProTaper Gold files.

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Cyclic Fatigue Resistance of Two Variable-taper Rotary File Systems: ProTaper Universal and V-Taper

Journal of Endodontics ◽

10.1016/j.joen.2009.01.002 ◽

2009 ◽

Vol 35 (4) ◽

pp. 555-558 ◽

Cited By ~ 11

Author(s):

Sterling J. Whipple ◽

Timothy C. Kirkpatrick ◽

Richard E. Rutledge

Keyword(s):

Fatigue Resistance ◽

File Systems ◽

Cyclic Fatigue

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Effect of the temperature of sodium hypochlorite on the cyclic fatigue resistance of ProTaper Gold rotary files

Dental and Medical Problems ◽

10.17219/dmp/126260 ◽

2021 ◽

Vol 58 (4) ◽

pp. 533-537

Author(s):

Seyed Amir Mousavi ◽

Niloofar Norouzi ◽

Bahareh Memarzadeh ◽

Seyed Rohollah Havaei Havaei ◽

Hazhir Yousefshahi

Keyword(s):

Fatigue Resistance ◽

Sodium Hypochlorite ◽

Cyclic Fatigue

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A comparative investigation between ProTaper Next, Hyflex CM, 2Shape, and TF-Adaptive file systems concerning cyclic fatigue resistance

Journal of Dental Research Dental Clinics Dental Prospects ◽

10.34172/joddd.2021.029 ◽

2021 ◽

Vol 15 (3) ◽

pp. 172-177

Author(s):

Sibel Koçak ◽

Faruk Furkan Şahin ◽

Olcay Özdemir ◽

Mustafa Murat Koçak ◽

Baran Can Sağlam

Keyword(s):

Fatigue Resistance ◽

Statistical Significance ◽

File Systems ◽

Cyclic Fatigue ◽

Comparative Investigation ◽

Cross Sectional ◽

Kolmogorov Smirnov ◽

Sectional Surface ◽

Number Of Cycles ◽

Alloy Properties

Background. This study aimed to compare the cyclic fatigue resistance of ProTaper Next, Hyflex CM, 2Shape, and TF-Adaptive nickel-titanium endodontic file systems with various alloy properties and production methods and investigate the fractured cross-sectional surface of files due to cyclic fatigue by scanning electron microscopy (SEM). Methods. A total of 120 instruments were used (n=30). For standardization, #25/.06 apical diameter and taper angle were selected for each file system. The experiment of files was subjected to a static cyclic fatigue model. The time for files’ failure was recorded with a digital chronometer and multiplied by the rotation speed to calculate the number of cycles. Kolmogorov-Smirnov, one-way ANOVA, and post hoc Bonferroni analysis were used for statistical analysis. Statistical significance was set at P<0.05. Results. The number of cycles for the failure of files was compared between the groups, and significant differences were found (P<0.05). The number of cycles for instrument failure was recorded from the highest to the lowest as follows: Hyflex CM, TF-Adaptive, ProTaper Next, and 2Shape. Conclusion. The files were fractured at different average numbers of cycles in an artificial canal in all the groups. The Hyflex CM demonstrated better cyclic fatigue resistance than TF Adaptive, ProTaper Next, and 2Shape file systems. Factors such as production patterns, alloy properties, and the phase in which the files were produced might affect the lifespan of file systems.

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