Shot peening increases resistance to cyclic fatigue fracture of endodontic files

Shot peening increases resistance to cyclic fatigue fracture of endodontic files

Abstract The objective of this study was to assess the resistance to fatigue fracture of conventional nickel–titanium files after undergoing shot peening. Forty NITIFLEX endodontic files, number 30, were divided into two groups; one was submitted to shot peening treatment and the other was not. All...

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Autores principales: Javier Nino-Barrera, Jose Sanchez-Aleman, Manuel Acosta-Humanez, Luis Gamboa-Martinez, Carlos Cortes-Rodriguez
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
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Acceso en línea:https://doaj.org/article/fc3d3a89f58d4a2e9bd26a7fa2bf4a63
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spelling oai:doaj.org-article:fc3d3a89f58d4a2e9bd26a7fa2bf4a632021-12-02T16:05:55ZShot peening increases resistance to cyclic fatigue fracture of endodontic files10.1038/s41598-021-92382-x2045-2322https://doaj.org/article/fc3d3a89f58d4a2e9bd26a7fa2bf4a632021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92382-xhttps://doaj.org/toc/2045-2322Abstract The objective of this study was to assess the resistance to fatigue fracture of conventional nickel–titanium files after undergoing shot peening. Forty NITIFLEX endodontic files, number 30, were divided into two groups; one was submitted to shot peening treatment and the other was not. All instruments were tested for fatigue fracture in simulated canals with a TRI-AUTO ZX endodontic motor. One file of each group was subjected to a residual stress analysis by XRD. Finally, the fractured surface was observed and elemental analysis performed by means of SEM and EDX. Roughness analysis was made by focal variation microscope. The shot peening group showed greater resistance to fatigue fracture; there was no difference in the length of the fractured fragments. XRD results showed the presence of residual compression stresses in the file submitted to shot peening, a decrease in the interplanar spacing, and an increase in the full-width-at-half-maximum and the microstrains. SEM and EDX showed a ductile fracture with zones of fatigue and an equiatomic ratio between the nickel and titanium. Surface roughness increased after the file was subjected to the shot peening procedure. In conclusion, shot peening increases the resistance to fatigue fracture due to the presence of residual compression stresses in files manufactured from a conventional nickel–titanium alloy.Javier Nino-BarreraJose Sanchez-AlemanManuel Acosta-HumanezLuis Gamboa-MartinezCarlos Cortes-RodriguezNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Javier Nino-Barrera
Jose Sanchez-Aleman
Manuel Acosta-Humanez
Luis Gamboa-Martinez
Carlos Cortes-Rodriguez
Shot peening increases resistance to cyclic fatigue fracture of endodontic files
description Abstract The objective of this study was to assess the resistance to fatigue fracture of conventional nickel–titanium files after undergoing shot peening. Forty NITIFLEX endodontic files, number 30, were divided into two groups; one was submitted to shot peening treatment and the other was not. All instruments were tested for fatigue fracture in simulated canals with a TRI-AUTO ZX endodontic motor. One file of each group was subjected to a residual stress analysis by XRD. Finally, the fractured surface was observed and elemental analysis performed by means of SEM and EDX. Roughness analysis was made by focal variation microscope. The shot peening group showed greater resistance to fatigue fracture; there was no difference in the length of the fractured fragments. XRD results showed the presence of residual compression stresses in the file submitted to shot peening, a decrease in the interplanar spacing, and an increase in the full-width-at-half-maximum and the microstrains. SEM and EDX showed a ductile fracture with zones of fatigue and an equiatomic ratio between the nickel and titanium. Surface roughness increased after the file was subjected to the shot peening procedure. In conclusion, shot peening increases the resistance to fatigue fracture due to the presence of residual compression stresses in files manufactured from a conventional nickel–titanium alloy.
format article
author Javier Nino-Barrera
Jose Sanchez-Aleman
Manuel Acosta-Humanez
Luis Gamboa-Martinez
Carlos Cortes-Rodriguez
author_facet Javier Nino-Barrera
Jose Sanchez-Aleman
Manuel Acosta-Humanez
Luis Gamboa-Martinez
Carlos Cortes-Rodriguez
author_sort Javier Nino-Barrera
title Shot peening increases resistance to cyclic fatigue fracture of endodontic files
title_short Shot peening increases resistance to cyclic fatigue fracture of endodontic files
title_full Shot peening increases resistance to cyclic fatigue fracture of endodontic files
title_fullStr Shot peening increases resistance to cyclic fatigue fracture of endodontic files
title_full_unstemmed Shot peening increases resistance to cyclic fatigue fracture of endodontic files
title_sort shot peening increases resistance to cyclic fatigue fracture of endodontic files
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/fc3d3a89f58d4a2e9bd26a7fa2bf4a63
work_keys_str_mv AT javierninobarrera shotpeeningincreasesresistancetocyclicfatiguefractureofendodonticfiles
AT josesanchezaleman shotpeeningincreasesresistancetocyclicfatiguefractureofendodonticfiles
AT manuelacostahumanez shotpeeningincreasesresistancetocyclicfatiguefractureofendodonticfiles
AT luisgamboamartinez shotpeeningincreasesresistancetocyclicfatiguefractureofendodonticfiles
AT carloscortesrodriguez shotpeeningincreasesresistancetocyclicfatiguefractureofendodonticfiles
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