Improvement of the fatigue resistance of NiTi endodontic files by surface and bulk modifications

Condorelli GG, Bonaccorso A, Smecca E, Schäfer E, Cantatore G, Tripi TR. Improvement of the fatigue resistance of NiTi endodontic files by surface and bulk modifications. International Endodontic Journal, 43, 866–873, 2010. Aim  To assess the failure mechanism of rotary NiTi instruments by chemical,...

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Published in:International endodontic journal 2010-10, Vol.43 (10), p.866-873
Main Authors: Condorelli, G. G., Bonaccorso, A., Smecca, E., Schäfer, E., Cantatore, G., Tripi, T. R.
Format: Article
Language:English
Subjects:
Carbon - analysis
Copper - analysis
Crystallography
Dental Alloys - analysis
Dental Alloys - chemistry
Dental Polishing - methods
Dentistry
Electricity
Electron Probe Microanalysis
electropolishing
Equipment Design
Equipment Failure
fracture mechanism
Hot Temperature
Humans
Materials Testing
Microscopy, Electron, Scanning
Nickel - analysis
Nickel - chemistry
NiTi instruments
Oxygen - analysis
Root Canal Preparation - instrumentation
Silicon - analysis
Spectrometry, X-Ray Emission
Stress, Mechanical
Surface Properties
thermal treatment
Titanium - analysis
Titanium - chemistry
X-Ray Diffraction
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Summary:Condorelli GG, Bonaccorso A, Smecca E, Schäfer E, Cantatore G, Tripi TR. Improvement of the fatigue resistance of NiTi endodontic files by surface and bulk modifications. International Endodontic Journal, 43, 866–873, 2010. Aim  To assess the failure mechanism of rotary NiTi instruments by chemical, structural and morphological analyses to provide a rational explanation of the effects of surface and bulk treatments on their resistance to fatigue fracture. Methodology  Thermal treatment (350–500 °C) was performed on electropolished (EP) and non‐electropolished (Non‐EP) NiTi endodontic instruments. Bulk and surface chemical composition and crystallographic structures were determined by energy‐dispersive X‐ray spectroscopy, X‐ray photoelectron spectroscopy (XPS) and X‐ray diffraction (XRD) to evaluate the effects of thermal treatment and electropolishing on the NiTi alloy. Fatigue tests of all instruments were performed. Surface morphology before and after the tests, and fractured section were analysed using scanning electron microscopy to determine crack extensions. Results were analysed statistically using analysis of variance (anova) and post hoc Student–Newman–Keuls test. Results  Before thermal treatment, significant differences (P 
ISSN:0143-2885
1365-2591
DOI:10.1111/j.1365-2591.2010.01759.x