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Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners

OBJECTIVE: The aim of this systematic multiscale analysis was to evaluate the effects of thermoforming on the physical and mechanical properties of thermoplastic materials used to fabricate transparent orthodontic aligners (TOAs). METHODS: Specimens were fabricated using four types of thermoplastic...

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Autores principales: Ryu, Jeong-Hyun, Kwon, Jae-Sung, Jiang, Heng Bo, Cha, Jung-Yul, Kim, Kwang-Mahn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Korean Association of Orthodontists 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6123073/
https://www.ncbi.nlm.nih.gov/pubmed/30206530
http://dx.doi.org/10.4041/kjod.2018.48.5.316
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author Ryu, Jeong-Hyun
Kwon, Jae-Sung
Jiang, Heng Bo
Cha, Jung-Yul
Kim, Kwang-Mahn
author_facet Ryu, Jeong-Hyun
Kwon, Jae-Sung
Jiang, Heng Bo
Cha, Jung-Yul
Kim, Kwang-Mahn
author_sort Ryu, Jeong-Hyun
collection PubMed
description OBJECTIVE: The aim of this systematic multiscale analysis was to evaluate the effects of thermoforming on the physical and mechanical properties of thermoplastic materials used to fabricate transparent orthodontic aligners (TOAs). METHODS: Specimens were fabricated using four types of thermoplastic materials with different thicknesses under a thermal vacuum. Transparency, water absorption and solubility, surface hardness, and the results of three-point bending and tensile tests were evaluated before and after thermoforming. Data were analyzed using one-way analysis of variance and Student's t-test. RESULTS: After thermoforming, the transparency of Duran and Essix A+ decreased, while the water absorption ability of all materials; the water solubility of Duran, Essix A+, and Essix ACE; and the surface hardness of Duran and Essix A+ increased. The flexure modulus for the 0.5-mm-thick Duran, Essix A+, and eCligner specimens increased, whereas that for the 0.75-/1.0-mm-thick Duran and eClginer specimens decreased. In addition, the elastic modulus increased for the 0.5-mm-thick Essix A+ specimens and decreased for the 0.75-mm-thick Duran and Essix ACE and the 1.0-mm-thick Essix ACE specimens. CONCLUSIONS: Our findings suggest that the physical and mechanical properties of thermoplastic materials used for the fabrication of TOAs should be evaluated after thermoforming in order to characterize their properties for clinical application.
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spelling pubmed-61230732018-09-11 Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners Ryu, Jeong-Hyun Kwon, Jae-Sung Jiang, Heng Bo Cha, Jung-Yul Kim, Kwang-Mahn Korean J Orthod Original Article OBJECTIVE: The aim of this systematic multiscale analysis was to evaluate the effects of thermoforming on the physical and mechanical properties of thermoplastic materials used to fabricate transparent orthodontic aligners (TOAs). METHODS: Specimens were fabricated using four types of thermoplastic materials with different thicknesses under a thermal vacuum. Transparency, water absorption and solubility, surface hardness, and the results of three-point bending and tensile tests were evaluated before and after thermoforming. Data were analyzed using one-way analysis of variance and Student's t-test. RESULTS: After thermoforming, the transparency of Duran and Essix A+ decreased, while the water absorption ability of all materials; the water solubility of Duran, Essix A+, and Essix ACE; and the surface hardness of Duran and Essix A+ increased. The flexure modulus for the 0.5-mm-thick Duran, Essix A+, and eCligner specimens increased, whereas that for the 0.75-/1.0-mm-thick Duran and eClginer specimens decreased. In addition, the elastic modulus increased for the 0.5-mm-thick Essix A+ specimens and decreased for the 0.75-mm-thick Duran and Essix ACE and the 1.0-mm-thick Essix ACE specimens. CONCLUSIONS: Our findings suggest that the physical and mechanical properties of thermoplastic materials used for the fabrication of TOAs should be evaluated after thermoforming in order to characterize their properties for clinical application. Korean Association of Orthodontists 2018-09 2018-08-08 /pmc/articles/PMC6123073/ /pubmed/30206530 http://dx.doi.org/10.4041/kjod.2018.48.5.316 Text en © 2018 The Korean Association of Orthodontists. http://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/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Ryu, Jeong-Hyun
Kwon, Jae-Sung
Jiang, Heng Bo
Cha, Jung-Yul
Kim, Kwang-Mahn
Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
title Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
title_full Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
title_fullStr Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
title_full_unstemmed Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
title_short Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
title_sort effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6123073/
https://www.ncbi.nlm.nih.gov/pubmed/30206530
http://dx.doi.org/10.4041/kjod.2018.48.5.316
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