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

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Chalermkwan Phuvoravan
Pokklaw Yamyindee
Ruethaichanok Chaichanawanich

Abstract

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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1.
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 2024 Mar. 28];22(1):26-33. Available from: https://he01.tci-thaijo.org/index.php/KDJ/article/view/198595
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