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Thermo-mechanical properties in bending of a multizone nickel-titanium archwire: A retrieval analysis

OBJECTIVE: This study aimed to compare the mechanical and thermal properties in the anterior and posterior segments of new and retrieved specimens of a commercially available multizone superelastic nickel-titanium (NiTi) archwire. METHODS: The following groups of 0.016 × 0.022-inch Bioforce NiTi arc...

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Autores principales: Roulias, Panagiotis, Mylonopoulou, Ioulia-Maria, Sifakakis, Iosif, Bourauel, Christoph, Eliades, Theodore
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Korean Association of Orthodontists 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10040288/
https://www.ncbi.nlm.nih.gov/pubmed/36746751
http://dx.doi.org/10.4041/kjod22.183
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author Roulias, Panagiotis
Mylonopoulou, Ioulia-Maria
Sifakakis, Iosif
Bourauel, Christoph
Eliades, Theodore
author_facet Roulias, Panagiotis
Mylonopoulou, Ioulia-Maria
Sifakakis, Iosif
Bourauel, Christoph
Eliades, Theodore
author_sort Roulias, Panagiotis
collection PubMed
description OBJECTIVE: This study aimed to compare the mechanical and thermal properties in the anterior and posterior segments of new and retrieved specimens of a commercially available multizone superelastic nickel-titanium (NiTi) archwire. METHODS: The following groups of 0.016 × 0.022-inch Bioforce NiTi archwires were compared a) anterior and b) posterior segments of new specimens and c) anterior and d) posterior segments of retrieved specimens. Six specimens were evaluated in each group, by three-point bending and bend and free recovery tests. Bending moduli (Eb) were calculated. Furthermore, the new specimens were evaluated with scanning electron microscopy/energy-dispersive X-ray spectrometry. A multiple linear regression model with a random intercept at the wire level was applied for data analysis. RESULTS: The forces in the posterior segments or new specimens were higher than those recorded in the anterior segments or retrieved specimens, respectively. Accordingly, Eb also varied. Higher austenite start and austenite finish (Af) temperatures were recorded in the anterior segments. No statistically significant differences were found for these temperatures between retrieved and new wires. The mean elemental composition was (weight percentage) Ni, 52.6 ± 0.5; Ti, 47.4 ± 0.5. CONCLUSIONS: The existence of multiple force zones was confirmed in new and retrieved Bioforce archwires. The retrieved archwires demonstrated lower forces during the initial stages of deactivation in three-point bending tests, compared with new specimens. The Af temperature of these archwires may lie higher than the regular intraoral temperature. Even at 2 mm deflections, the forces recorded from these archwires may lie beyond biologically safe limits.
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spelling pubmed-100402882023-03-28 Thermo-mechanical properties in bending of a multizone nickel-titanium archwire: A retrieval analysis Roulias, Panagiotis Mylonopoulou, Ioulia-Maria Sifakakis, Iosif Bourauel, Christoph Eliades, Theodore Korean J Orthod Original Article OBJECTIVE: This study aimed to compare the mechanical and thermal properties in the anterior and posterior segments of new and retrieved specimens of a commercially available multizone superelastic nickel-titanium (NiTi) archwire. METHODS: The following groups of 0.016 × 0.022-inch Bioforce NiTi archwires were compared a) anterior and b) posterior segments of new specimens and c) anterior and d) posterior segments of retrieved specimens. Six specimens were evaluated in each group, by three-point bending and bend and free recovery tests. Bending moduli (Eb) were calculated. Furthermore, the new specimens were evaluated with scanning electron microscopy/energy-dispersive X-ray spectrometry. A multiple linear regression model with a random intercept at the wire level was applied for data analysis. RESULTS: The forces in the posterior segments or new specimens were higher than those recorded in the anterior segments or retrieved specimens, respectively. Accordingly, Eb also varied. Higher austenite start and austenite finish (Af) temperatures were recorded in the anterior segments. No statistically significant differences were found for these temperatures between retrieved and new wires. The mean elemental composition was (weight percentage) Ni, 52.6 ± 0.5; Ti, 47.4 ± 0.5. CONCLUSIONS: The existence of multiple force zones was confirmed in new and retrieved Bioforce archwires. The retrieved archwires demonstrated lower forces during the initial stages of deactivation in three-point bending tests, compared with new specimens. The Af temperature of these archwires may lie higher than the regular intraoral temperature. Even at 2 mm deflections, the forces recorded from these archwires may lie beyond biologically safe limits. Korean Association of Orthodontists 2023-03-25 2023-03-25 /pmc/articles/PMC10040288/ /pubmed/36746751 http://dx.doi.org/10.4041/kjod22.183 Text en © 2023 The Korean Association of Orthodontists. https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0 (https://creativecommons.org/licenses/by-nc/4.0/) ) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Roulias, Panagiotis
Mylonopoulou, Ioulia-Maria
Sifakakis, Iosif
Bourauel, Christoph
Eliades, Theodore
Thermo-mechanical properties in bending of a multizone nickel-titanium archwire: A retrieval analysis
title Thermo-mechanical properties in bending of a multizone nickel-titanium archwire: A retrieval analysis
title_full Thermo-mechanical properties in bending of a multizone nickel-titanium archwire: A retrieval analysis
title_fullStr Thermo-mechanical properties in bending of a multizone nickel-titanium archwire: A retrieval analysis
title_full_unstemmed Thermo-mechanical properties in bending of a multizone nickel-titanium archwire: A retrieval analysis
title_short Thermo-mechanical properties in bending of a multizone nickel-titanium archwire: A retrieval analysis
title_sort thermo-mechanical properties in bending of a multizone nickel-titanium archwire: a retrieval analysis
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10040288/
https://www.ncbi.nlm.nih.gov/pubmed/36746751
http://dx.doi.org/10.4041/kjod22.183
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