Effects of R-Phase on Mechanical Responses of a Nickel-Titanium Endodontic Instrument: Structural Characterization and Finite Element Analysis
The 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: superela...
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| Format: | Article |
| Language: | English |
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Wiley
2016-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2016/7617493 |
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| author | Leandro de Arruda Santos Pedro Damas Resende Maria Guiomar de Azevedo Bahia Vicente Tadeu Lopes Buono |
| author_facet | Leandro de Arruda Santos Pedro Damas Resende Maria Guiomar de Azevedo Bahia Vicente Tadeu Lopes Buono |
| author_sort | Leandro de Arruda Santos |
| collection | DOAJ |
| description | The 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. |
| format | Article |
| id | doaj-art-e3878d9d15ad483d91288f0b2c944285 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-e3878d9d15ad483d91288f0b2c9442852025-02-03T06:44:18ZengWileyThe Scientific World Journal2356-61401537-744X2016-01-01201610.1155/2016/76174937617493Effects of R-Phase on Mechanical Responses of a Nickel-Titanium Endodontic Instrument: Structural Characterization and Finite Element AnalysisLeandro de Arruda Santos0Pedro Damas Resende1Maria Guiomar de Azevedo Bahia2Vicente Tadeu Lopes Buono3Department of Metallurgical and Materials Engineering, School of Engineering, Universidade Federal de Minas Gerais (UFMG), 31270-901 Belo Horizonte, MG, BrazilDepartment of Metallurgical and Materials Engineering, School of Engineering, Universidade Federal de Minas Gerais (UFMG), 31270-901 Belo Horizonte, MG, BrazilDepartment of Restorative Dentistry, Faculty of Dentistry, Universidade Federal de Minas Gerais (UFMG), 31270-901 Belo Horizonte, MG, BrazilDepartment of Metallurgical and Materials Engineering, School of Engineering, Universidade Federal de Minas Gerais (UFMG), 31270-901 Belo Horizonte, MG, BrazilThe 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.http://dx.doi.org/10.1155/2016/7617493 |
| spellingShingle | Leandro de Arruda Santos Pedro Damas Resende Maria Guiomar de Azevedo Bahia Vicente Tadeu Lopes Buono Effects of R-Phase on Mechanical Responses of a Nickel-Titanium Endodontic Instrument: Structural Characterization and Finite Element Analysis The Scientific World Journal |
| title | Effects of R-Phase on Mechanical Responses of a Nickel-Titanium Endodontic Instrument: Structural Characterization and Finite Element Analysis |
| title_full | Effects of R-Phase on Mechanical Responses of a Nickel-Titanium Endodontic Instrument: Structural Characterization and Finite Element Analysis |
| title_fullStr | Effects of R-Phase on Mechanical Responses of a Nickel-Titanium Endodontic Instrument: Structural Characterization and Finite Element Analysis |
| title_full_unstemmed | Effects of R-Phase on Mechanical Responses of a Nickel-Titanium Endodontic Instrument: Structural Characterization and Finite Element Analysis |
| title_short | Effects of R-Phase on Mechanical Responses of a Nickel-Titanium Endodontic Instrument: Structural Characterization and Finite Element Analysis |
| title_sort | effects of r phase on mechanical responses of a nickel titanium endodontic instrument structural characterization and finite element analysis |
| url | http://dx.doi.org/10.1155/2016/7617493 |
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