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Survival analysis of factors influencing cyclic fatigue of nickel-titanium endodontic instruments

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dc.title Survival analysis of factors influencing cyclic fatigue of nickel-titanium endodontic instruments en
dc.contributor.author Fišerová, Eva
dc.contributor.author Chvosteková, Martina
dc.contributor.author Bělašková, Silvie
dc.contributor.author Bumbálek, Michal
dc.contributor.author Joska, Zdeněk
dc.relation.ispartof Advances in Materials Science and Engineering
dc.identifier.issn 1687-8434 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2015
utb.relation.volume 2015
dc.citation.spage 1
dc.citation.epage 6
dc.type article
dc.language.iso en
dc.publisher Hindawi Publishing Corporation
dc.identifier.doi 10.1155/2015/189703
dc.relation.uri http://www.hindawi.com/journals/amse/2015/189703/
dc.description.abstract Objective. The aim of this study was to validate a survival analysis assessing the effect of type of rotary system, canal curvature, and instrument size on cyclic resistance. Materials and Methods. Cyclic fatigue testing was carried out in stainless steel artificial canals with radii of curvature of 3 or 5 mm and the angle of curvature of 60 degrees. All the instruments were new and 25 mm in working length, and ISO colour coding indicated the instrument size (yellow for size 20; red for size 25). Wizard Navigator instruments, Mtwo instruments, ProTaper instruments, and Revo-S instruments were passively rotated at 250 rotations per minute, and the time fracture was being recorded. Subsequently, fractographic analysis of broken tips was performed by scanning electron microscope. The data were then analysed by the Kaplan-Meier estimator of the survival function, the Cox proportional hazards model, the Wald test for regression covariates, and the Wald test for significance of regression model. Conclusion. The lifespan registered for the tested instruments was Mtwo > Wizard Navigator > Revo-S > ProTaper; 5 mm radius > 3 mm radius; and yellow > red in ISO colour coding system. en
utb.faculty Faculty of Applied Informatics
dc.identifier.uri http://hdl.handle.net/10563/1005731
utb.identifier.obdid 43874407
utb.identifier.scopus 2-s2.0-84944202920
utb.identifier.wok 000362755800001
utb.source j-wok
dc.date.accessioned 2015-11-12T11:40:58Z
dc.date.available 2015-11-12T11:40:58Z
dc.description.sponsorship Ministry of Education, Youth and Sports of the Czech Republic [CZ.1.07/2.3.00/20.0170, CZ.1.07/2.3.00/30.0041]
dc.rights Attribution-NonCommercial-NoDerivs 3.0 Unported
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/
dc.rights.access openAccess
utb.contributor.internalauthor Bělašková, Silvie
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