Cyclic fatigue resistance of rotary nickel-titanium instruments submitted to nitrogen ion implantation

Journal of Endodontics
Giulio GaviniCelso Luiz Caldeira

Abstract

The aim of this study was to assess cyclic fatigue resistance in rotary nickel-titanium instruments submitted to nitrogen ion implantation by using a custom-made cyclic fatigue testing apparatus. Thirty K3 files, size #25, taper 0.04, were divided into 3 experimental groups as follows: group A, 12 files exposed to nitrogen ion implantation at a dose of 2.5 x 10(17) ions/cm(2), accelerating voltage of 200 kV, currents of 1 microA/cm(2), 130 degrees C temperature, and vacuum conditions of 10 x 10(-6) torr for 6 hours; group B, 12 nonimplanted files; and group C, 6 files submitted to thermal annealing for 6 hours at 130 degrees C. One extra file was used for process control. All files were submitted to a cyclic fatigue test that was performed with an apparatus that allowed the instruments to rotate freely, simulating rotary instrumentation of a curved canal (40-degree, 5-mm radius curve). An electric motor handpiece was used with a contra-angle of 16:1 at an operating speed of 300 rpm and a torque of 2 N-cm. Time to failure was recorded with a stopwatch in seconds and subsequently converted to number of cycles to fracture. Data were analyzed with the Student t test (P < .05). Ion-implanted instruments reached significantly higher ...Continue Reading

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Citations

Apr 21, 2012·Journal of Endodontics·Marcelo dos SantosCristiane da Costa
Mar 15, 2012·Journal of Endodontics·Nilav BhagabatiSangeeta Talwar
Apr 21, 2012·Journal of Endodontics·Giulio GaviniDirce Akemi Sacaguti Kawakami
Jul 6, 2011·Dental Clinics of North America·Rory E Mortman
May 6, 2015·Journal of Investigative and Clinical Dentistry·Prasanna NeelakantanJames L Gutmann
Jun 16, 2016·Brazilian Oral Research·Alexander Pompermayer JardinePatrícia Maria Poli Kopper
Jun 20, 2013·Brazilian Dental Journal·Oscar Faciola PessoaGiulio Gavini
Apr 13, 2013·British Dental Journal·M B McGuiganH F Duncan
May 26, 2017·Bioinorganic Chemistry and Applications·Kee-Yeon Kum, Seok Woo Chang
May 17, 2018·Restorative Dentistry & Endodontics·Eugenio PedullàLuca Testarelli
May 1, 2021·Materials·Michal BumbalekKarel Klima

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