Susceptibility to localized corrosion of stainless steel and NiTi endodontic instruments in irrigating solutions

Darabara, M.; Bourithis, L.; Zinelis, Spiros; Papadimitriou, G.

doi:10.1111/j.1365-2591.2004.00866.x

Cited by 66 publications

(67 citation statements)

References 24 publications

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“…Endodontic file instruments are designed to be used at body temperature, which is 37° C approximately [29]. Endodontic files were heat up to body temperature with a a Bosch hot air 12 gun D-70745, since room temperature was at ~20° C at the time the experiment was run.…”

Section: Experimental Validation Of the Numerical Resultsmentioning

confidence: 99%

A study on the influence of Ni–Ti M-Wire in the flexural fatigue life of endodontic rotary files by using Finite Element Analysis

Montalvão

Shengwen

Freitas

2014

Materials Science and Engineering: C

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The aim of this paper is to analyze the cyclic performance of two different Ni-Ti endodontic rotary files made from different alloys under bending using Finite Element Analysis (FEA).When experimentation is not available, this is not a trivial task and most papers on the subject rely on static analysis only. Two Ni-Ti rotary instruments are selected, ProFile GT and a GT Series X (GTX). The latter file is made from M-Wire, which has been thermo-mechanically processed to have larger flexibility, according to its manufacturer. The mechanical response was studied by considering different scenarios in the FEA package, in which the material properties were introduced according to existing literature. The method and results are presented and discussed so that this paper can be used as a guideline for future works.Although not fully reflective of the instrument's behavior in a dynamic rotation intra-canal system, the models used constitute a good approximation when a comparison between two instruments is at stake. It is shown that the GTX file has a lower risk of fatigue fracture during its clinical use when compared to the GT file, especially when the root canal makes the file deform into an extreme geometry. However, if the root canal does not make the file deform more than a certain amount, the GT file is equally good from the point of view of mechanical endurance.

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Section: Experimental Validation Of the Numerical Resultsmentioning

confidence: 99%

A study on the influence of Ni–Ti M-Wire in the flexural fatigue life of endodontic rotary files by using Finite Element Analysis

Montalvão

Shengwen

Freitas

2014

Materials Science and Engineering: C

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“…Significant signs of surface corrosion were reported by O' Hoy and colleagues 20) after overnight immersion, whereas Darabara et al 21) found no signs of corrosion after immersion for 1 hour in 5.25% NaOCl and 17% ethylenediaminetetraacetic acid (EDTA) heated to 37℃. The inconsistent results are due mainly to the different study conditions and interpretations.…”

Section: ⅰ Introductionmentioning

confidence: 91%

Comparative analysis of various corrosive environmental conditions for NiTi rotary files

Yum

Park

Hur

et al. 2008

J Korean Acad Conserv Dent

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“…Apart from reasons mentioned for the fatigue failure of NiTi instruments, others have suggested that the corrosion mechanisms, as a result of chemomechanical preparation and chemical disinfection or sterilisation, might be an initial factor for fatigue failure. These authors have questioned the effect of pitting or crevice corrosion on the surface of endodontic NiTi rotary instruments (12,13).…”

Section: Highlightsmentioning

confidence: 99%

Influence of an Innovative Anti-Corrosive Solution on Resistance of Endodontic NiTi Rotary Instruments: A Preliminary Study

Saghiri¹,

Asatourian²,

Godoy³

2017

Eur Endod J

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Objective:To evaluate the effects of deionised water, blood, phosphate-buffered saline (PBS) and a new anti-corrosive solution based on methoxy propyl amine (MOPA) on the cyclic fatigue resistance of endodontic NiTi rotary instruments under in vitro conditions. Methods: Forty ProTaper F1 files were provided and divided to four groups (n=10). Samples were first autoclaved and then stored in deionised water, blood, PBS or MOPA for 24 hours. Cyclic fatigue was tested with a custom-made stainless-steel block including artificial canals (curvature angle=30 degree, radius of curvature=5 mm). After immersion in test solutions, samples were rotated 300 rpm until fracture occurred. The number of cycles to failure (NCF) was calculated using recorded fracture time. Results: Data were analysed by the Kolmogorov-Smirnov, Levene, ANOVA and Scheffe statistical tests. Samples in blood group showed the lowest and samples in MOPA group showed the highest NCF values. Significant difference was observed between groups (p=0.001). NCF value of PBS group was significantly more than the NCF values of samples in blood and deionised water groups (p<0.05). Conclusion:The tested novel anti-corrosive solution significantly increased the fracture resistance of the endodontic NiTi rotary instruments by reducing the cyclic fatigue. In contrast, blood and deionised water caused more corrosion and resulted in earlier file fracture. Keywords: anti-corrosion, cyclic fatigue, NCF, NiTi rotary INTRODUCTIONThe advent of NiTi rotary instruments to the field of endodontic was a revolutionary change. These devices are made of pseudo-elastic alloy of nickel and titanium (Nitinol 55) and have an incredible influence on the mechanical preparations of root canals (1). The instrumentation of narrow and curved root canals can be challenging for many clinicians. Walia et al. showed that Nitinol files are at least two to three times more flexible than stainless steel (SS) files (2). The flexibility can enable the instrument to be used in curved and complex root canals with more facility and lower root canal shape alterations (3).Many investigators have shown that the unexpected separation of NiTi rotary instruments, apart from higher strength and flexibility, remains a clinical challenge. This undesirable event can occur without any significant deformation seen on the surface of instrument (4). Different causes, such as cyclic fatigue, static and dynamic torsional fatigues, have been attributed to the fracture of these devices (5). Cyclic fatigue is described by the alternating tension and compression cycles, which occur inside the structure of an instrument when it is moving through the maximum curvature of root canal (6). The cyclic fatigue is generally a concern in curved canals, and the many ABSTRACT HIGHLIGHTS• Deionized water and blood can negatively influence the structure of NiTi made devices. • Methoxy propyl amine (MOPA) novel solution is an anti-corrosive agent, which can increase the cyclic fatigue resistance and delay separation of NiTi made rotary...

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Susceptibility to localized corrosion of stainless steel and NiTi endodontic instruments in irrigating solutions

Abstract: None of the tested materials is susceptible to pitting or crevice corrosion in R-EDTA and NaOCl solutions and from this standpoint are appropriate for the production of endodontic files.

Cited by 66 publications

References 24 publications

A study on the influence of Ni–Ti M-Wire in the flexural fatigue life of endodontic rotary files by using Finite Element Analysis

A study on the influence of Ni–Ti M-Wire in the flexural fatigue life of endodontic rotary files by using Finite Element Analysis

Comparative analysis of various corrosive environmental conditions for NiTi rotary files

Influence of an Innovative Anti-Corrosive Solution on Resistance of Endodontic NiTi Rotary Instruments: A Preliminary Study

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