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Relevant Aspects in the Mechanical and Aging Degradation of NiTi Alloy with R-Phase in Endodontic Files

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https://hdl.handle.net/20.500.12080/42812
dc.contributor.author Patricia, Sánchez
dc.contributor.author Benedetta, Vidi
dc.contributor.author Rico Romano, Cristina
dc.contributor.author Mena Alvarez, Jesús
dc.contributor.author Gil, Javier
dc.contributor.author Aragoneses, Juan Manuel
dc.date.accessioned 2024-07-22T17:20:44Z
dc.date.available 2024-07-22T17:20:44Z
dc.date.created 2024-07
dc.date.issued 2024-07
dc.identifier.uri https://hdl.handle.net/20.500.12080/42812
dc.description.abstract One of the most important challenges in endodontics is to have files that have excellent flexibility, toughness, and high fatigue life. Superelastic NiTi alloys have been a breakthrough and the new R-phase NiTi alloys promise to further optimize the good properties of NiTi alloys. In this work, two austenitic phase endodontic files with superelastic properties (Protaper and F6) and two austenitic phase files with the R-phase (M-wire and Reciproc) have been studied. The transformation temperatures were studied by calorimetry. Molds reproducing root canals at different angles (30, 45, and 70°) were obtained with cooling and loads simulating those used in the clinic. Mechanical cycles of different files were realized to fracture. Transformation temperatures were determined at different number of cycles. The different files were heat treated at 300 and 500 °C as the aging process, and the transformation temperatures were also determined. Scanning and transmission electron microscopy was used to observe the fractography and precipitates of the files. The results show that files with the R-phase have higher fracture cycles than files with only the austenitic phase. The fracture cycles depend on the angle of insertion in the root canal, with the angle of 70° being the one with the lowest fracture cycles in all cases. The R-Phase transformation increases the energy absorbed by the NiTi to produce the austenitic to R-phase and to produce the martensitic transformation causing the increase in the fracture cycles. Mechanical cycling leads to significant increases in the transformation temperatures Ms and Af as well as Rs and Rf. No changes in the transformation temperatures were observed for aging at 300 °C, but the appearance of Ni4Ti3 precipitates was observed in the aging treatments to the Nickel-rich files that correspond to those with the R transition. These results should be considered by endodontists to optimize the type of files for clinical therapy. es_ES
dc.format application/pdf es_ES
dc.language eng es_ES
dc.publisher MDPI es_ES
dc.rights CC-BY es_ES
dc.rights.uri http://creativecommons.org/licenses/by/4.0/deed.es es_ES
dc.subject NiTi; endodontic files; R-phase; superelasticity; fatigue es_ES
dc.title Relevant Aspects in the Mechanical and Aging Degradation of NiTi Alloy with R-Phase in Endodontic Files es_ES
dc.type info:eu-repo/semantics/publishedVersion es_ES
dc.description.curso 2023/2024 es_ES
dc.rights.accessrights info:eu-repo/semantics/openAccess es_ES
dc.identifier.dl 2024
dc.accrualPolicy Publicación en curso es_ES
dc.identifier.location N/A es_ES


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