Survival Analysis of Factors Influencing Cyclic Fatigue of Nickel-Titanium Endodontic Instruments
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...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2015/189703 |
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| author | Eva Fišerová Martina Chvosteková Silvie Bělašková Michal Bumbálek Zdeněk Joska |
| author_facet | Eva Fišerová Martina Chvosteková Silvie Bělašková Michal Bumbálek Zdeněk Joska |
| author_sort | Eva Fišerová |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-2f51a200da5b45a79207606c9afa35b6 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-2f51a200da5b45a79207606c9afa35b62025-02-03T05:48:02ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422015-01-01201510.1155/2015/189703189703Survival Analysis of Factors Influencing Cyclic Fatigue of Nickel-Titanium Endodontic InstrumentsEva Fišerová0Martina Chvosteková1Silvie Bělašková2Michal Bumbálek3Zdeněk Joska4Department of Mathematical Analysis and Applications of Mathematics, Faculty of Science, Palacký University in Olomouc, 17 Listopadu 12, 771 46 Olomouc, Czech RepublicDepartment of Mathematical Analysis and Applications of Mathematics, Faculty of Science, Palacký University in Olomouc, 17 Listopadu 12, 771 46 Olomouc, Czech RepublicDepartment of Mathematical Analysis and Applications of Mathematics, Faculty of Science, Palacký University in Olomouc, 17 Listopadu 12, 771 46 Olomouc, Czech RepublicInstitute of Clinical and Experimental Dental Medicine, First Faculty of Medicine, Charles University General Teaching Hospital, Prague, Czech RepublicCommunication and Information Systems Agency, Czech Army, Tychonova 1, 160 01 Prague, Czech RepublicObjective. 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.http://dx.doi.org/10.1155/2015/189703 |
| spellingShingle | Eva Fišerová Martina Chvosteková Silvie Bělašková Michal Bumbálek Zdeněk Joska Survival Analysis of Factors Influencing Cyclic Fatigue of Nickel-Titanium Endodontic Instruments Advances in Materials Science and Engineering |
| title | Survival Analysis of Factors Influencing Cyclic Fatigue of Nickel-Titanium Endodontic Instruments |
| title_full | Survival Analysis of Factors Influencing Cyclic Fatigue of Nickel-Titanium Endodontic Instruments |
| title_fullStr | Survival Analysis of Factors Influencing Cyclic Fatigue of Nickel-Titanium Endodontic Instruments |
| title_full_unstemmed | Survival Analysis of Factors Influencing Cyclic Fatigue of Nickel-Titanium Endodontic Instruments |
| title_short | Survival Analysis of Factors Influencing Cyclic Fatigue of Nickel-Titanium Endodontic Instruments |
| title_sort | survival analysis of factors influencing cyclic fatigue of nickel titanium endodontic instruments |
| url | http://dx.doi.org/10.1155/2015/189703 |
| work_keys_str_mv | AT evafiserova survivalanalysisoffactorsinfluencingcyclicfatigueofnickeltitaniumendodonticinstruments AT martinachvostekova survivalanalysisoffactorsinfluencingcyclicfatigueofnickeltitaniumendodonticinstruments AT silviebelaskova survivalanalysisoffactorsinfluencingcyclicfatigueofnickeltitaniumendodonticinstruments AT michalbumbalek survivalanalysisoffactorsinfluencingcyclicfatigueofnickeltitaniumendodonticinstruments AT zdenekjoska survivalanalysisoffactorsinfluencingcyclicfatigueofnickeltitaniumendodonticinstruments |