The impact of composition, core metal mass and phase transformation behaviour on the dynamic cyclic fatigue of Ni-Ti files at different temperatures
https://doi.org/10.32067/GIE.2021.35.02.58
Accepted: 25 February 2022
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Aim: To assess impact of elemental composition, core metal mass and phase transformation behaviour on the dynamic cyclic fatigue resistance of three Ni-Ti rotary files at room and body temperatures.
Methods: Twenty instruments of each system were tested for dynamic cyclic fatigue resistance in a simulated root canal with a 90˚ angle of curvature and a 5-mm radius of curvature at room and body temperature. The core metal mass at the fractured surface of each instrument was calculated by Image J software analysis of SEM images. The energy dispersive X-ray analysis was used to assess file composition. Scanning calorimetry was used to assess the structural phase state and the transformation temperature. One-way analysis of variance (ANOVA) was performed to determine any statistical difference amongst groups. For inter-group comparison, the unpaired t-test was used.
Results: HEDM showed significantly higher TtF and NCF values than AFBS and ZB-F6 instruments, at both temperatures tested. The mean core metal mass was smallest in HEDM followed by AFBS with no statistical difference between them, while ZB-F6 had the significantly largest metal core. EDX analysis showed that all the instruments were mainly composed by nickel and titanium. DSC analysis revealed that HEDM and AFBS exhibited a martensitic phase at body (37˚C) and room temperature (25˚C), whereas ZB-F6 revealed an austenitic phase at body temperature.
Conclusions: Dynamic cyclic fatigue resistance increased when the instruments had less cross-sectional metal mass, less Ni (wt%), a thermally treated surface, and a martensite phase at body temperature.
Sattapan B, Nervo GJ, Palamara JE, Messer HH. Defects in rotary nickel-titanium files after clinical use. J Endod 2000;26:161–5.
Pruett JP, Clement DJ, Carnes DLJ. Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod 1997;23:77–85.
Gambarini G, Seracchiani M, Piasecki L, et al. Measurement of torque generated during intracanal instrumentation in vivo. Int Endod J 2019;52:737–45.
Saber SE. Factors influencing the fracture of rotary nickel titanium instruments. ENDO 2008;2:273–83.
Ounsi HF, Al-Shalan T, Salameh Z, et al. Quantitative and qualitative elemental analysis of different nickel-titanium rotary instruments by using scanning electron microscopy and energy dispersive spectroscopy. J Endod 2008;34:53–5.
de Vasconcelos RA, Murphy S, Carvalho CAT, et al. Evidence for reduced fatigue resistance of contemporary rotary instruments exposed to body temperature. J Endod 2016;42:782–7.
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.
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.
Pedullà E, Lo Savio F, Boninelli S, et al. Torsional and cyclic fatigue resistance of a new nickel-titanium instrument manufactured by electrical discharge machining. J Endod 2016;42:156–9.
Pedullà E, La Rosa GRM, Virgillito C, et al. Cyclic fatigue resistance of nickel-titanium rotary instruments according to the angle of file access and radius of root canal. J Endod 2020;46:431–6.
Hülsmann M, Donnermeyer D, Schäfer E. A critical appraisal of studies on cyclic fatigue resistance of engine-driven endodontic instruments. Int Endod J 2019;52:1427–45.
Elsewify T, Saber S, Plotino G. Cyclic fatigue resistance of three heat-treated nickel-titanium instruments at simulated body temperature. Saudi Endod J 2020;10:131–6.
Nishjo M, Ebihara A, Tokita D, et al. Evaluation of selected mechanical properties of NiTi rotary glide path files manufactured from controlled memory wires. Dent Mater J 2018;37:549–54.
Özyürek T, Gündoğar M, Uslu G, et al. Cyclic fatigue resistances of Hyflex EDM, WaveOne gold, Reciproc blue and 2shape NiTi rotary files in different artificial canals. Odontology 2018;106:408–13.
2020_Fanta_Catalogue1586847482370.pdf.
Tanomaru-Filho M, Galletti Espir C, Carolina Venção A, et al. Cyclic fatigue resistance of heat-treated nickel-titanium instruments. Iran Endod J 2018;13:312–7.
Tanomaru-Filho M, Espir CG, Venção AC, et al. Cyclic fatigue resistance of heat-treated nickel-titanium instruments. Iran Endod J 2018;13:312–7.
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.
Grande NM, Plotino G, Pecci R, et al. Cyclic fatigue resistance and three-dimensional analysis of instruments from two nickel–titanium rotary systems. Int Endod J 2006;39:755–63.
Craveiro de Melo MC, de Azevedo Bahia MG, Lopes Buono VT. Fatigue resistance of engine-driven rotary nickel-titanium endodontic instruments. J Endod 2002;28:765–9.
Cheung GSP, Darvell BW. Low-cycle fatigue of NiTi rotary instruments of various cross-sectional shapes. Int Endod J 2007;40:626–32.
Testarelli L, Plotino G, Al-Sudani D, et al. Bending properties of a new nickel-titanium alloy with a lower percent by weight of nickel. J Endod 2011;37:1293–5.
Zhou H, Shen Y, Zheng W, et al. Mechanical properties of controlled memory and superelastic nickel-titanium wires used in the manufacture of rotary endodontic instruments. J Endod 2012;38:1535–40.
Huang X, Shen Y, Wei X, Haapasalo M. Fatigue resistance of nickel-titanium instruments exposed to high-concentration hypochlorite. J Endod 2017;43:1847–51.
de Hemptinne F, Slaus G, Vandendael M, et al. Intracanal temperature evolution during endodontic treatment after the injection of room temperature or preheated sodium hypochlorite. J Endod 2015;41:1112–5.
Arias A, Macorra JC, Govindjee S, Peters OA. Correlation between temperature-dependent fatigue resistance and differential scanning calorimetry analysis for 2 contemporary rotary instruments. J Endod 2018;44:630–4.
Shen Y, Zhou HM, Zheng YF, et al. Metallurgical characterization of controlled memory wire nickel-titanium rotary instruments. J Endod 2011;37:1566–71.
Pedullà E, Ambu E, Rovai F, et al. Influence of proper or reciprocating optimum torque reverse kinematics on cyclic fatigue of four single files. J Investig Clin Dent 2019;10:e12409.
Hülsmann M. Research that matters: studies on fatigue of rotary and reciprocating NiTi root canal instruments. Int Endod J 2019;52:1401–2.
Silva EJNL, Martins JNR, Lima CO, et al. Mechanical tests, metallurgical characterization, and shaping ability of nickel-titanium rotary instruments: A Multimethod Research. J Endod 2020;46:1485–94.
Copyright (c) 2022 Mohamed Salah Abdel Aziz Elwakeel, Ahmed Abdel Rahman Hashem , Sarah Hossam Fahmy, Shehabeldin Mohamed Saber, Gianluca Plotino
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Giornale Italiano di Endodonzia has chosen to apply the Creative Commons Attribution NonCommercial 4.0 International License (CC BY-NC 4.0) to all manuscripts to be published.
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