Cyclic Fatigue Resistance of Hyflex® CM after Immersion in Different Root Canal Irrigants

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Chalermkwan Phuvoravan
Pokklaw Yamyindee
Ruethaichanok Chaichanawanich


The aim of this study was to compare cyclic fatigue resistance of Hyflex® CM nickel titanium rotary instruments no. 25 after immersion in root canal irrigants. A total of 40 new Hyflex® CM files were randomly assigned to 4 groups (n=10). Group 1 was a control group with non-contact to solution and Group 2-4 were submitted in 2.5% sodium hypochlorite (NaOCl), 17% ethylene
diaminetetraacetic acid (EDTA), and 2% chorhexidine gluconate (CHX) respectively, at 37°C for 5 minutes. Then, all instruments were tested for cyclic fatigue resistance in the stainless steel artificial canal with a 60° angle of curvature and 5-mm radius of curvature. Files were rotated at the constant speed of 500 rpm with 2.5 N/cm torque. Numbers of rotation before fracture (NRF)
were recorded. Mean NRF of group 1 revealed the highest value, followed by group 4, group 3 and group 2, respectively. Statistic analysis revealed the resistance to cyclic fatigue of Hyflex® CM significantly reduced when immersed in all 3 root canal irrigants when compared with control group (p < 0.05).


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Phuvoravan C, Yamyindee P, Chaichanawanich R. Cyclic Fatigue Resistance of Hyflex® CM after Immersion in Different Root Canal Irrigants. Khon Kaen Dent J [Internet]. 2019 Jun. 27 [cited 2023 Feb. 5];22(1):26-33. Available from:
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1. Peters OA, Gluskin AK, Weiss RA, Han JT. An in vitro assessment of the physical properties of novel Hyflex nickel-titanium rotary instruments. Int Endod J 2012 Nov;45(11):1027-34.
2. Panitvisai P. Chapter 5: Innovation in root canal treatment. Endodontics. Bangkok: Chulalongkorn University Press; 2016.
3. Plotino G, Grande NM, Cordaro M, Testarelli L, Gambarini G. A review of cyclic fatigue testing of nickel-titanium rotary instruments. J Endod 2009 Nov;35(11):1469-76.
4. Jena A, Sahoo SK, Govind S. Root canal irrigants: a review of their interactions, benefits, and limitations. Compend Contin Educ Dent 2015 Apr;36(4):256-61.
5. Topcuoglu HS, Pala K, Aktı A, Düzgün S, Topçuoglu G. Cyclic fatigue resistance of D-RaCe, ProTaper, and Mtwo nickeltitanium retreatment instruments after immersion in sodium hypochlorite. Clin Oral Investig 2016 Jul;20(6):1175-9.
6. Pedullà E, Franciosi G, Ounsi HF, Tricarico M, Rapisarda E, Grandini S. Cyclic fatigue resistance of nickel-titanium instruments after immersion in irrigant solutions with or without surfactants. J Endod 2014 Aug;40(8):1245-9.
7. Hasegawa Y, Goto S, Ogura H. Effect of EDTA solution on corrosion fatigue of Ni-Ti files with different shapes. Dent Mat J 2014;33(3):415-21.
8. Dagna A, Poggio C, Beltrami R, Chiesa M, Bianchi S. Cyclic fatigue resistance of three NiTi single-file systems after immersion in EDTA. Dentistry 2013;4(1):1-4.
9. Berutti E, Angelini E, Rigolone M, Migliaretti G, Pasqualini D. Influence of sodium hypochlorite on fracture properties and corrosion of ProTaper Rotary instruments. Int Endod J 2006 Sep;39(9):693-9.
10. Shen Y, Zhou HM, Zheng YF, Campbell L, Peng B, Haapasalo M. Metallurgical characterization of controlled memory wire nickel-titanium rotary instruments. J Endod 2011 Nov;37(11):1566-71.
11. Amato M, Pantaleo G, Abdellatif D, Blasi A, Giudice R,Landolo A. Evaluation of cyclic fatigue resistance of modern nickel-titanium rotary instruments with continuous rotation. G Ital Endod 2017;31(2):78-82.
12. Larsen CM, Watanabe I, Glickman GN, He J. Cyclic fatigue analysis of a new generation of nickel titanium rotary instruments. J Endod 2009 Mar;35(3):401-3.
13. Pedullà E, Grande NM, Plotino G, Palermo F, Gambarini G, Rapisarda E. Cyclic fatigue resistance of two reciprocating nickel-titanium instruments after immersion in sodium hypochlorite. Int Endod J 2013 Feb;46(2):155-9.
14. Ruddle CJ, Machtou P, West JD. The shaping movement: fifth-generation technology. Dent Today 2013 Apr;32(4):94, 96-9.
15. Popovic J, Radenkovic G, Gasic J, ivković S, Mitic A, Nikolic M, Barac R, Jelena P, Goran R, Jovanka G, Slavoljub Z, Aleksandar M, Marija N, Radomir B. The examination of sensitivity to corrosion of nickel-titanium and stainless steel endodontic instruments in root canal irrigating solutions. Chem Ind Chem Eng Q 2016;22(1):95-100.
16. Nóvoa XR, Martin-Biedma B, Varela-Patiño P, Collazo A, Macías-Luaces A, Cantatore G, Pérez MC, Magán-Muñoz F. The corrosion of nickel-titanium rotary endodontic instruments in sodium hypochlorite. Int Endod J 2007 Jan;40(1):36-44.
17. Ametrano G, D’Antò V, Di Caprio MP, Simeone M, Rengo S, Spagnuolo G. Effects of sodium hypochlorite and ethylenediaminetetraacetic acid on rotary nickel-titanium instruments evaluated using atomic force microscopy. Int Endod J 2011 Mar;44(3):203-9.