Cyclic Fatigue Resistance and Fractographic Analysis of Race and Protaper Rotary NiTi Instruments

INTRODUCTION: This study investigated the fatigue and fracture modes of RaCe and ProTaper rotary instruments. MATERIALS AND METHODS: Fatigue resistance was evaluated by rotating the files 30° or 60° and with 2 or 5mm radius of curvature. RaCe taper 06 size 25 and ProTaper F1 files (n=40) were used....

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Autores principales: Azimi, Shahram, Delvari, Parisa, Hajarian, Hamid Cyrus, Saghiri, Mohammad Ali, Karamifar, Kasra, Lotfi, Mehrdad
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Iranian Center for Endodontic Research 2011
Materias:
Original Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3487508/
https://www.ncbi.nlm.nih.gov/pubmed/23130057
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author Azimi, Shahram
Delvari, Parisa
Hajarian, Hamid Cyrus
Saghiri, Mohammad Ali
Karamifar, Kasra
Lotfi, Mehrdad
author_facet Azimi, Shahram
Delvari, Parisa
Hajarian, Hamid Cyrus
Saghiri, Mohammad Ali
Karamifar, Kasra
Lotfi, Mehrdad
author_sort Azimi, Shahram
collection PubMed
description INTRODUCTION: This study investigated the fatigue and fracture modes of RaCe and ProTaper rotary instruments. MATERIALS AND METHODS: Fatigue resistance was evaluated by rotating the files 30° or 60° and with 2 or 5mm radius of curvature. RaCe taper 06 size 25 and ProTaper F1 files (n=40) were used. The number of rotations to failure was analyzed by two-way ANOVA and independent sample t-test. Fracture surfaces were examined under a scanning electron microscope. RESULTS: Both files exhibited significantly more resistance to fracture when angle severity was reduced and increase in curvature radius (P=0.000). ProTaper demonstrated higher number of cycle of failure (P=0.0029) in one group (r=5mm, 60º). SEM observation revealed fatigue mark/features in 17 specimens, shear characteristics in 37 samples, and tensile overload in 26 samples. CONCLUSION: Radius of curvature was the main factor in torsional and fatigue failures.
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spelling pubmed-34875082012-11-05 Cyclic Fatigue Resistance and Fractographic Analysis of Race and Protaper Rotary NiTi Instruments Azimi, Shahram Delvari, Parisa Hajarian, Hamid Cyrus Saghiri, Mohammad Ali Karamifar, Kasra Lotfi, Mehrdad Iran Endod J Original Article INTRODUCTION: This study investigated the fatigue and fracture modes of RaCe and ProTaper rotary instruments. MATERIALS AND METHODS: Fatigue resistance was evaluated by rotating the files 30° or 60° and with 2 or 5mm radius of curvature. RaCe taper 06 size 25 and ProTaper F1 files (n=40) were used. The number of rotations to failure was analyzed by two-way ANOVA and independent sample t-test. Fracture surfaces were examined under a scanning electron microscope. RESULTS: Both files exhibited significantly more resistance to fracture when angle severity was reduced and increase in curvature radius (P=0.000). ProTaper demonstrated higher number of cycle of failure (P=0.0029) in one group (r=5mm, 60º). SEM observation revealed fatigue mark/features in 17 specimens, shear characteristics in 37 samples, and tensile overload in 26 samples. CONCLUSION: Radius of curvature was the main factor in torsional and fatigue failures. Iranian Center for Endodontic Research 2011 2011-05-15 /pmc/articles/PMC3487508/ /pubmed/23130057 Text en Copyright © Iranian Endodontic Journal, 2011. http://creativecommons.org/licenses/by/2.5/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Azimi, Shahram
Delvari, Parisa
Hajarian, Hamid Cyrus
Saghiri, Mohammad Ali
Karamifar, Kasra
Lotfi, Mehrdad
Cyclic Fatigue Resistance and Fractographic Analysis of Race and Protaper Rotary NiTi Instruments
title Cyclic Fatigue Resistance and Fractographic Analysis of Race and Protaper Rotary NiTi Instruments
title_full Cyclic Fatigue Resistance and Fractographic Analysis of Race and Protaper Rotary NiTi Instruments
title_fullStr Cyclic Fatigue Resistance and Fractographic Analysis of Race and Protaper Rotary NiTi Instruments
title_full_unstemmed Cyclic Fatigue Resistance and Fractographic Analysis of Race and Protaper Rotary NiTi Instruments
title_short Cyclic Fatigue Resistance and Fractographic Analysis of Race and Protaper Rotary NiTi Instruments
title_sort cyclic fatigue resistance and fractographic analysis of race and protaper rotary niti instruments
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3487508/
https://www.ncbi.nlm.nih.gov/pubmed/23130057
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