STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY)
Abd Elsalam, R., Moussa, S., Sherif, R. (2020). STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY). EKB Journal Management System, 45(3), 67-73. doi: 10.21608/adjalexu.2020.122740
Raghdaa A. Abd Elsalam; Sybel M. Moussa; Raef A. Sherif. "STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY)". EKB Journal Management System, 45, 3, 2020, 67-73. doi: 10.21608/adjalexu.2020.122740
Abd Elsalam, R., Moussa, S., Sherif, R. (2020). 'STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY)', EKB Journal Management System, 45(3), pp. 67-73. doi: 10.21608/adjalexu.2020.122740
Abd Elsalam, R., Moussa, S., Sherif, R. STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY). EKB Journal Management System, 2020; 45(3): 67-73. doi: 10.21608/adjalexu.2020.122740

STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY)

Alexandria Dental Journal
Article 12, Volume 45, Issue 3, December 2020, Page 67-73  XML PDF (1.26 MB)
Document Type: Original Article
DOI: 10.21608/adjalexu.2020.122740
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Authors
Raghdaa A. Abd Elsalam email 1; Sybel M. Moussa2; Raef A. Sherif2
1Bachelor of Dentistry, Faculty of Dentistry, Pharos University, Alexandria, Egypt
2Professor of Endodontics Department, Faculty of Dentistry, University of Alexandria, Alexandria, Egypt
Abstract
INTRODUCTION: Cyclic fatigue fracture is caused by repeated compressive/tensile stresses that accumulate around the curved rotating file. Many efforts have been made to increase the fracture resistance of Nickel-titanium (NiTi) rotary instruments, such as the use of heat-treated alloy, modification of the instrument's cross section and the improvement of surface treatment.
OBJECTIVES: The aim of this study was to compare the static flexural cyclic fatigue of TwoShape (Micro Mega, Besancon, France) rotary file system which is made of T-Wire heat treatment technology and OneShape (Micro Mega, Besancon, France) rotary file system which is made of conventional nickel-titanium alloy.
MATERIALS AND METHODS: Eighteen files from each system were subjected to static cyclic fatigue test. Cyclic fatigue testing was performed in a device which allowed a reproducible position of the instrument inside a custom-made stainless-steel artificial canal. The artificial canal had a curvature of 60° angle and 5 mm radius. All instruments were allowed to rotate inside the artificial canal until fracture. Time to fracture (TTF) was recorded using a digital chronometer. The number of cycles to failure (NCF) was calculated. The length of separated fragments was recorded. Data were analysed.
RESULTS: The NCF of TwoShape files (365.909±82.077) was statistically significantly higher when compared with the OneShape files (266.681±35.218) p < .05. While there was no significant difference in the length of separated segments between both systems.
CONCLUSIONS:Within the limitations of this study, the cyclic fatigue resistance of heat treated TwoShape files was significantly higher than the OneShape files. [T-wire] heat treatment drastically enhanced the cyclic fatigue resistance of the file.  
Keywords
cyclic fatigue; OneShape; TwoShape; artificial canal; number of cycles to fracture; NiTi rotary files
References

1. Chernick LB, Jacobs JJ, Lautenschlager EP, Heuer MA. Torsional failure of endodontic files. J Endod. 1976;2:94-7.
2. Ullmann CJ, Peters OA. Effect of cyclic fatigue on static fracture loads in ProTaper nickel-titanium rotary instruments. J Endod. 2005;31:183-6.
3. Mokhtari H, Niknami M, Sohrabi A, Habibivand E, Mokhtari Zonouzi HR, Rahimi S, et al. Cone-beam computed tomography comparison of canal transportation after preparation with biorace and mtwo rotary instruments and hand K-flexofiles. Iran Endod J. 2014;9:180-4.
4. Sattapan B, Nervo GJ, Palamara JE, Messer HH. Defects in rotary nickel-titanium files after clinical use. J Endod. 2000;26:161-5.
5. Tokita D, Ebihara A, Miyara K, Okiji T. Dynamic torsional and cyclic fracture behavior of ProFile rotary instruments at continuous or reciprocating rotation as visualized with high-speed digital video imaging. J Endod. 2017;43:1337-42.
6. Goo HJ, Kwak SW, Ha JH, Pedullà E, Kim HC. Mechanical properties of various heat-treated nickel-titanium rotary instruments. J Endod. 2017;43:1872-7.
7. Sharma P, Goel M, Verma S. entering a new era in endodontics with revolutionary single file systems: A comprehensive review. EC Dental Sci. 2016;5:1100-22.
8. Topçuoğlu HS, Topçuoğlu G, Akti A, Düzgün S. In vitro comparison of cyclic fatigue resistance of ProTaper Next, HyFlex CM, OneShape, and ProTaper Universal instruments in a canal with a double curvature. J Endod. 2016;42:969-71.
9. 2Shape, séquence de 2 instruments de mise en forme en rotation continue. 2017. Available at: http://micro-mega.com/shaping/2shape.
10. Plotino G, Grande NM, Cordaro M, Testarelli L, Gambarini G. A review of cyclic fatigue testing of nickel-titanium rotary instruments. J Endod. 2009;35:1469-76.
11. De-Deus G, Vieira VT, da Silva EJ, Lopes H, Elias CN, Moreira EJ. Bending resistance and dynamic and static cyclic fatigue life of Reciproc and WaveOne large instruments. J Endod. 2014;40:575-9.
12. Higuera O, Plotino G, Tocci L, Carrillo G, Gambarini G, Jaramillo DE. Cyclic fatigue resistance of 3 different nickel-titanium reciprocating instruments in artificial canals. J Endod. 2015;41:913-5.
13. Adıgüzel M, Capar ID. Comparison of cyclic fatigue resistance of WaveOne and WaveOne Gold small, primary, and large instruments. J Endod. 2017;43:623-7.

14. Alcalde MP, Tanomaru-Filho M, Bramante CM, Duarte MA, Guerreiro-Tanomaru JM, Camilo-Pinto J, et al. Cyclic and torsional fatigue resistance of reciprocating single files manufactured by different nickel-titanium alloys. J Endod. 2017;43:1186-91.
15. Keskin C, Inan U, Demiral M, Keleş A. Cyclic fatigue resistance of Reciproc Blue, Reciproc, and WaveOne Gold reciprocating instruments. J Endod. 2017;43:1360-3.
16. Testarelli L, Plotino G, Al-Sudani D, Vincenzi V, Giansiracusa A, Grande NM, et al. Bending properties of a new nickel-titanium alloy with a lower percent by weight of nickel. J Endod. 2011;37:1293-5.
17. Lopes HP, Gambarra-Soares T, Elias CN, Siqueira Jr JF, Inojosa IF, Lopes WS, et al. Comparison of the mechanical properties of rotary instruments made of conventional nickel-titanium wire, M-wire, or nickel-titanium alloy in R-phase. J Endod. 2013;39:516-20.
18. Pruett JP, Clement DJ, Carnes DL. Cyclic fatigue testing of nickel titanium endodontic instruments. J Endod. 1997;23:77-85.
19. Inan U, Aydin C, Demirkaya K. Cyclic fatigue resistance of new and used Mtwo rotary nickel‐titanium instruments in two different radii of curvature. Aust Endod J. 2011;37:105-8.
20. Özyürek T. Cyclic fatigue resistance of Reciproc, WaveOne, and WaveOne Gold nickel-titanium instruments. J Endod. 2016;42:1536-9.
21. IBM Corp. IBM SPSS Statistics for Windows, Version 21.0. Armonk, NY: IBM Corp.; Released 2012.
22. Field A. Discovering Statistics Using IBM SPSS Statistics. 4th ed. London, California, New Delhi: SAGE Publications Ltd; 2013.
23. Snecdecor GW, Cochran WG. Statistical Methods: Chapter 2: The Mean and Standard Deviation. Wiley; 1991; 14-29.
24. Mann HB, Whitney DR. On a test of whether one of two random variables is stochastically larger than the other. Ann Math Stat. 1947;50-60.
25. Plotino G, Grande NM, Mazza C, Petrovic R, Testarelli L, Gambarini G. Influence of size and taper of artificial canals on the trajectory of NiTi rotary instruments in cyclic fatigue studies. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010;109:e60-6.
26. Sekar V, Kumar R, Nandini S, Ballal S, Velmurugan N. Assessment of the role of cross section on fatigue resistance of rotary files when used in reciprocation. Eur J Dent. 2016;10:541-5.
27. Uslu G, Özyürek T, İnan U. Comparison of cyclic fatigue resistance of ProGlider and one G glide path files. J Endod. 2016;42:1555-8.
28. Yılmaz K, Özyürek T. Cyclic fatigue life of Tango-Endo, WaveOne GOLD, and reciproc NiTi instruments. Restor Dent Endod. 2017;42:134-9.
29. Keleş A, Eymirli A, Uyanık O, Nagas E. Influence of static and dynamic cyclic fatigue tests on the lifespan of four reciprocating systems at different temperatures. Int Endod J. 2019;52:880-6.
30. Dosanjh A, Paurazas S, Askar M. The effect of temperature on cyclic fatigue of Nickel-titanium rotary endodontic instruments. J Endod. 2017;43:823-6.
31. Ataya M, Ha JH, Kwak SW, Abu-Tahun IH, El Abed R, Kim HC. Mechanical Properties of Orifice Preflaring Nickel-titanium Rotary Instrument Heat Treated Using T-Wire Technology. J Endod. 2018;44:1867-71.
32. Gündoğar M, Özyürek T. Cyclic fatigue resistance of OneShape, HyFlex EDM, WaveOne gold, and Reciproc blue nickel-titanium instruments. J Endod. 2017;43:1192-6.
33. Staffoli S, Grande NM, Plotino G, Özyürek T, Gündoğar M, Fortunato L, et al. Influence of environmental temperature, heat-treatment and design on the cyclic fatigue resistance of three generations of a single-file nickel–titanium rotary instrument. Odontology. 2019;107:301-7.
34. Uslu G, Özyürek T, Gündoğar M, Yılmaz K. Cyclic fatigue resistance of 2Shape, Twisted File and EndoSequence Xpress nickel-titanium rotary files at intracanal temperature. J Dent Res Dent Clin Dent Prospects. 2018;12:283-7.
35. Neelakantan P, Reddy P, Gutmann JL. Cyclic fatigue of two different single files with varying kinematics in a simulated double‐curved canal. J Investig Clin Dent. 2016;7:272-7.
36. Serafin M, De Biasi M, Franco V, Angerame D. In vitro comparison of cyclic fatigue resistance of two rotary single-file endodontic systems: OneCurve versus OneShape. Odontology. 2019 Apr 15;107(2):196-201.
37. Topçuoğlu HS, Topçuoğlu G, Akti A, Düzgün S. In vitro comparison of cyclic fatigue resistance of ProTaper Next, HyFlex CM, OneShape, and ProTaper Universal instruments in a canal with a double curvature. J Endod. 2016 Jun 1;42(6):969-71.
38. Wang Z, Zhang W, Zhang X. Cyclic Fatigue Resistance and Force Generated by OneShape Instruments during Curved Canal Preparation. PloS one. 2016;11:e0160815.

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