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Post-Cure Development of the Degree of Conversion and Mechanical Properties of Dual-Curing Resin Cements

This study investigated the effect of different curing conditions on the degree of conversion and mechanical properties of contemporary dual-curing resin cements. The material specimens were either light-cured directly, light-cured through a 1-mm lithium disilicate glass-ceramic layer, or self-cured...

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Autores principales: Carek, Andreja, Dukaric, Ksenija, Miler, Helena, Marovic, Danijela, Tarle, Zrinka, Par, Matej
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9460751/
https://www.ncbi.nlm.nih.gov/pubmed/36080725
http://dx.doi.org/10.3390/polym14173649
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author Carek, Andreja
Dukaric, Ksenija
Miler, Helena
Marovic, Danijela
Tarle, Zrinka
Par, Matej
author_facet Carek, Andreja
Dukaric, Ksenija
Miler, Helena
Marovic, Danijela
Tarle, Zrinka
Par, Matej
author_sort Carek, Andreja
collection PubMed
description This study investigated the effect of different curing conditions on the degree of conversion and mechanical properties of contemporary dual-curing resin cements. The material specimens were either light-cured directly, light-cured through a 1-mm lithium disilicate glass-ceramic layer, or self-cured. The degree of conversion was measured in 0.1-mm films using Fourier-transform infrared spectroscopy 1 day, 7 days, and 28 days post-cure. Specimens used to study the flexural strength and modulus were prepared according to the ISO 4049 protocol, stored for 28 days post-cure, and subjected to accelerated aging by absolute ethanol immersion. The degree of conversion values ranged between 44.3–77.8%. Flexural strength varied between 11.4–111.1 MPa, while flexural modulus amounted to 0.7–5.5 GPa. The degree of conversion was significantly affected by material type, curing conditions, and post-cure time; however, variations in curing conditions were the least influential factor. A statistically significant effect of curing conditions on the degree of conversion was identified for only one of the five materials tested, whereas the flexural strength and modulus of all tested materials were significantly reduced in the experimental groups that were light-cured through a ceramic layer or self-cured. The effect size analysis showed that mechanical properties were most affected by the material type, while the differences in curing conditions were less influential. A comparison of the degree of conversion and mechanical properties indicated that different curing conditions may lead to significantly different flexural strength and modulus, which are not necessarily accompanied by identifiable variations in the degree of conversion.
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spelling pubmed-94607512022-09-10 Post-Cure Development of the Degree of Conversion and Mechanical Properties of Dual-Curing Resin Cements Carek, Andreja Dukaric, Ksenija Miler, Helena Marovic, Danijela Tarle, Zrinka Par, Matej Polymers (Basel) Article This study investigated the effect of different curing conditions on the degree of conversion and mechanical properties of contemporary dual-curing resin cements. The material specimens were either light-cured directly, light-cured through a 1-mm lithium disilicate glass-ceramic layer, or self-cured. The degree of conversion was measured in 0.1-mm films using Fourier-transform infrared spectroscopy 1 day, 7 days, and 28 days post-cure. Specimens used to study the flexural strength and modulus were prepared according to the ISO 4049 protocol, stored for 28 days post-cure, and subjected to accelerated aging by absolute ethanol immersion. The degree of conversion values ranged between 44.3–77.8%. Flexural strength varied between 11.4–111.1 MPa, while flexural modulus amounted to 0.7–5.5 GPa. The degree of conversion was significantly affected by material type, curing conditions, and post-cure time; however, variations in curing conditions were the least influential factor. A statistically significant effect of curing conditions on the degree of conversion was identified for only one of the five materials tested, whereas the flexural strength and modulus of all tested materials were significantly reduced in the experimental groups that were light-cured through a ceramic layer or self-cured. The effect size analysis showed that mechanical properties were most affected by the material type, while the differences in curing conditions were less influential. A comparison of the degree of conversion and mechanical properties indicated that different curing conditions may lead to significantly different flexural strength and modulus, which are not necessarily accompanied by identifiable variations in the degree of conversion. MDPI 2022-09-02 /pmc/articles/PMC9460751/ /pubmed/36080725 http://dx.doi.org/10.3390/polym14173649 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/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/).
spellingShingle Article
Carek, Andreja
Dukaric, Ksenija
Miler, Helena
Marovic, Danijela
Tarle, Zrinka
Par, Matej
Post-Cure Development of the Degree of Conversion and Mechanical Properties of Dual-Curing Resin Cements
title Post-Cure Development of the Degree of Conversion and Mechanical Properties of Dual-Curing Resin Cements
title_full Post-Cure Development of the Degree of Conversion and Mechanical Properties of Dual-Curing Resin Cements
title_fullStr Post-Cure Development of the Degree of Conversion and Mechanical Properties of Dual-Curing Resin Cements
title_full_unstemmed Post-Cure Development of the Degree of Conversion and Mechanical Properties of Dual-Curing Resin Cements
title_short Post-Cure Development of the Degree of Conversion and Mechanical Properties of Dual-Curing Resin Cements
title_sort post-cure development of the degree of conversion and mechanical properties of dual-curing resin cements
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9460751/
https://www.ncbi.nlm.nih.gov/pubmed/36080725
http://dx.doi.org/10.3390/polym14173649
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