Journal
JOURNAL OF MATERIALS RESEARCH
Volume 26, Issue 10, Pages 1234-1242Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2011.52
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Funding
- G.M.J. Schmidt Minerva Center
- Harold Perlman Foundation
- Irving and Cherna Moskowitz Center for Nano and Bio-Nano Imaging
- Israel Science Foundation
- ERC [INTIF 226639]
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Nickel-titanium (NiTi) alloys combine several remarkable characteristics, among them are shape-memory, superelasticity, great strain recovery, good biocompatibility, and corrosion resistance. These render them well suited to a wide range of medical applications, such as cardiovascular stents, laparoscopy, and dental applications such as NiTi endodontic files (EFs) used for root canal treatment, which are the focus of this work. Unfortunately, fatigue-induced and incidental failure of NiTi EFs is not uncommon, which may lead to severe medical consequences. Here we examine the effects of cobalt coatings with impregnated fullerene-like WS2 nanoparticles on file fatigue and failure. Dynamic x-ray diffraction, nanoindentation and torque measurements all indicate a significant improvement in the fatigue resistance and time to breakage of the coated files, stemming from reduced friction between the file and the surrounding tissue. These methods are possibly applicable to a variety of NiTi-based medical devices where fatigue and consequent failure are of relevance.
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