Effects of R-Phase on mechanical responses of a nickel-titanium endodontic instrument: structural characterization and finite element analysis

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dc.creatorLeandro de Arruda Santos
dc.creatorPedro Damas Resende
dc.creatorMaria Guiomar de Azevedo Bahia
dc.creatorVicente Tadeu Lopes Buono
dc.date.accessioned2023-07-27T18:58:19Z
dc.date.accessioned2025-09-08T23:20:21Z
dc.date.available2023-07-27T18:58:19Z
dc.date.issued2016
dc.identifier.doihttps://doi.org/10.1155/2016/7617493
dc.identifier.issn1537-744X
dc.identifier.urihttps://hdl.handle.net/1843/57090
dc.languagepor
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofThe Scientific World Journal
dc.rightsAcesso Aberto
dc.subjectMetodo dos elementos finitos
dc.subject.otherStructural Characterization
dc.subject.otherFinite Element Analysis
dc.titleEffects of R-Phase on mechanical responses of a nickel-titanium endodontic instrument: structural characterization and finite element analysis
dc.typeArtigo de periódico
local.citation.epage12
local.citation.spage1
local.citation.volume2016
local.description.resumoThe effects of the presence of the R-phase in a near-equiatomic NiTi alloy on the mechanical responses of an endodontic instrument were studied by using finite element analysis. The input data for the constitutive model in the simulation were obtained by tensile testing of three NiTi wires: superelastic austenite NiTi, austenite + R-phase NiTi, and fully R-phased NiTi. The wires were also characterized by X-ray diffraction and differential scanning calorimetry. A commercially available endodontic instrument was scanned using microcomputed tomography, and the resulting images were used to build the geometrical model. The numerical analyses were performed in ABAQUS using load and boundary conditions based on the ISO 3630-1 specification for the bending and torsion of endodontic instruments. The modeled instrument containing only R-phase demanded the lowest moment to be bent, followed by the one with mixed austenite + R-phase. The superelastic instrument, containing essentially austenite, required the highest bending moment. During bending, the fully R-phased instrument reached the lowest stress values; however, it also experienced the highest angular deflection when subjected to torsion. In summary, this simulation showed that NiTi endodontic instruments containing only R-phase in their microstructure would show higher flexibility without compromising their performance under torsion.
local.identifier.orcidhttps://orcid.org/0000-0001-9172-6429
local.identifier.orcidhttps://orcid.org/0000-0003-1830-2704
local.identifier.orcidhttps://orcid.org/0000-0003-1565-1888
local.identifier.orcidhttps://orcid.org/0000-0002-0574-5218
local.publisher.countryBrasil
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA METALÚRGICA
local.publisher.departmentFAO - FACULDADE DE ODONTOLOGIA
local.publisher.initialsUFMG
local.url.externahttps://www.hindawi.com/journals/tswj/2016/7617493/

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