Nickel-Titanium Rotary File Systems: What's New?
Austenite phase
R-phase
controlled memory
martensite phase
nickel–titanium (NiTi) alloys
thermo-mechanical treatment
Journal
European endodontic journal
ISSN: 2548-0839
Titre abrégé: Eur Endod J
Pays: Turkey
ID NLM: 101717480
Informations de publication
Date de publication:
2019
2019
Historique:
received:
08
03
2019
accepted:
17
06
2019
entrez:
13
3
2020
pubmed:
13
3
2020
medline:
13
3
2020
Statut:
epublish
Résumé
Ever since their introduction, nickel-titanium (NiTi) alloys have continued to revolutionize the field of endodontics. They have considerable advantages over the conventional stainless steel file in terms of mechanical properties. However, despite of their superior mechanical properties, NiTi alloys still pose some risk of fracture. Consequently, there has been considerable research conducted to investigate the mechanisms behind the occurrence of these procedural errors. Since the last decade, different proprietary processing procedures have been introduced to further improve the mechanical properties of NiTi alloys. These treatments include thermal, mechanical, electropolishing, and recently introduced electric discharge machining. The main purpose of these treatments is to impart a more martensitic phase into the files at normal body temperature, so that the maximum advantage of flexibility can be obtained. These heat-treated instruments also possess improved cyclic fatigue resistance when compared to conventional NiTi alloys. NiTi alloys can be subclassified as the instruments mainly containing austenitic phase (conventional NiTi, M-wire, R-phase), and those containing martensitic phase (controlled memory wire, ProTaper Gold, and Vortex Blue). Instruments based on austenitic alloys possess superelastic properties due to the stress-induced martensitic transformation. Contrary to this, martensitic alloys can easily be deformed due to phase transformation, and they can demonstrate the shape memory effect when heated. This review discusses the different phase transformations and heat treatments that the NiTi instruments undergo.
Identifiants
pubmed: 32161896
doi: 10.14744/eej.2019.80664
pii: EEJ-4-111
pmc: PMC7006588
doi:
Types de publication
Journal Article
Review
Langues
eng
Pagination
111-117Informations de copyright
Copyright: © 2019 European Endodontic Journal.
Déclaration de conflit d'intérêts
Conflict of interest: The authors declared no conflict of interest.
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