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Cyclic fatigue resistance of P ro T aper N ext nickel‐titanium rotary files
Author(s) -
Elnaghy A. M.
Publication year - 2014
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12244
Subject(s) - cyclic stress , scanning electron microscope , fatigue testing , fracture (geology) , chemistry , materials science , crystallography , metallurgy , composite material
Aim To compare the cyclic fatigue resistance of P ro T aper N ext files ( PTN ; D entsply M aillefer, B allaigues, S witzerland) with T wisted Files ( TF ; S ybron E ndo, O range, CA , USA ), H y F lex CM ( HF ; C olténe E ndo/ W haledent, I nc, C uyahoga F alls, OH , USA ) and P ro T aper U niversal ( PT ; D entsply M aillefer). Methodology Size 25, .06 taper for PTN X2, TF , HF and PT F 1 size 20, .07 taper were rotated in simulated canals until failure, and the number of cycles to failure ( NCF ) was recorded to evaluate their cyclic fatigue resistance. A scanning electron microscope was used to characterize the topographic features of the fracture surfaces of broken files. The data of the NCF and fragment length values were analysed statistically using one‐way analysis of variance and T ukey post hoc tests. Statistical significance level was set at P < 0.05. Results Twisted Files had a significantly higher resistance to cyclic fatigue than the other instruments ( P < 0.05). No significant difference was found in NCF between PTN and HF ( P > 0.05); however, there was a significant difference ( P < 0.05) of both these systems with PT , which exhibited the lowest mean NCF . The ranking in the NCF values was: TF > PTN > HF > PT . The fracture cross‐sections of all brands revealed similar fractographic features, including crack origins, fatigue zone and an overload fast fracture zone. Conclusions The new P ro T aper N ext had greater resistance to cyclic fatigue compared with P ro T aper and H y F lex CM but not the T wisted F iles.