Relevant aspects in the mechanical and aging degradation of NiTi alloy with R-phase in endodontic files

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...

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Autores: Sánchez, Patricia, Vidi, Benedetta, Rico, Cristina, MENA-ALVAREZ, JESUS, Gil, FJ, Aragoneses, Juan Manuel
Tipo de recurso: artículo
Fecha de publicación:2024
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:20.500.12328/4810
Acceso en línea:http://hdl.handle.net/20.500.12328/4810
https://dx.doi.org/10.3390/ma17133351
Access Level:acceso abierto
Palabra clave:NiTi
Fitxes d'endodòncia
Fase R
Superelasticitat
Fatiga
Limas endodónticas
Superelasticidad
Endodontic files
R-phase
Superelasticity
Fatigue
616.3
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oai_identifier_str oai:recercat.cat:20.500.12328/4810
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spelling Relevant aspects in the mechanical and aging degradation of NiTi alloy with R-phase in endodontic filesSánchez, PatriciaVidi, BenedettaRico, CristinaMENA-ALVAREZ, JESUSGil, FJAragoneses, Juan ManuelNiTiFitxes d'endodònciaFase RSuperelasticitatFatigaNiTiLimas endodónticasFase RSuperelasticidadFatigaNiTiEndodontic filesR-phaseSuperelasticityFatigue616.3One 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.info:eu-repo/semantics/publishedVersionMDPI2024info:eu-repo/semantics/article15http://hdl.handle.net/20.500.12328/4810https://dx.doi.org/10.3390/ma17133351reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésMaterials17© 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:recercat.cat:20.500.12328/48102026-05-29T05:05:01Z
dc.title.none.fl_str_mv Relevant aspects in the mechanical and aging degradation of NiTi alloy with R-phase in endodontic files
title Relevant aspects in the mechanical and aging degradation of NiTi alloy with R-phase in endodontic files
spellingShingle Relevant aspects in the mechanical and aging degradation of NiTi alloy with R-phase in endodontic files
Sánchez, Patricia
NiTi
Fitxes d'endodòncia
Fase R
Superelasticitat
Fatiga
NiTi
Limas endodónticas
Fase R
Superelasticidad
Fatiga
NiTi
Endodontic files
R-phase
Superelasticity
Fatigue
616.3
title_short Relevant aspects in the mechanical and aging degradation of NiTi alloy with R-phase in endodontic files
title_full Relevant aspects in the mechanical and aging degradation of NiTi alloy with R-phase in endodontic files
title_fullStr Relevant aspects in the mechanical and aging degradation of NiTi alloy with R-phase in endodontic files
title_full_unstemmed Relevant aspects in the mechanical and aging degradation of NiTi alloy with R-phase in endodontic files
title_sort Relevant aspects in the mechanical and aging degradation of NiTi alloy with R-phase in endodontic files
dc.creator.none.fl_str_mv Sánchez, Patricia
Vidi, Benedetta
Rico, Cristina
MENA-ALVAREZ, JESUS
Gil, FJ
Aragoneses, Juan Manuel
author Sánchez, Patricia
author_facet Sánchez, Patricia
Vidi, Benedetta
Rico, Cristina
MENA-ALVAREZ, JESUS
Gil, FJ
Aragoneses, Juan Manuel
author_role author
author2 Vidi, Benedetta
Rico, Cristina
MENA-ALVAREZ, JESUS
Gil, FJ
Aragoneses, Juan Manuel
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv NiTi
Fitxes d'endodòncia
Fase R
Superelasticitat
Fatiga
NiTi
Limas endodónticas
Fase R
Superelasticidad
Fatiga
NiTi
Endodontic files
R-phase
Superelasticity
Fatigue
616.3
topic NiTi
Fitxes d'endodòncia
Fase R
Superelasticitat
Fatiga
NiTi
Limas endodónticas
Fase R
Superelasticidad
Fatiga
NiTi
Endodontic files
R-phase
Superelasticity
Fatigue
616.3
description 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.
publishDate 2024
dc.date.none.fl_str_mv 2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/20.500.12328/4810
https://dx.doi.org/10.3390/ma17133351
url http://hdl.handle.net/20.500.12328/4810
https://dx.doi.org/10.3390/ma17133351
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Materials
17
dc.rights.none.fl_str_mv https://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 15
dc.publisher.none.fl_str_mv MDPI
publisher.none.fl_str_mv MDPI
dc.source.none.fl_str_mv reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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