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Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

This study investigated the influence of light-curing at high irradiances on micromechanical properties of resin cements. Three dual-curing resin cements and a light-curing flowable resin composite were light-cured with an LED curing unit in Standard mode (SM), High Power mode (HPM), or Xtra Power m...

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Autores principales: Peutzfeldt, Anne, Lussi, Adrian, Flury, Simon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi Publishing Corporation 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5164896/
https://www.ncbi.nlm.nih.gov/pubmed/28044129
http://dx.doi.org/10.1155/2016/4894653
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author Peutzfeldt, Anne
Lussi, Adrian
Flury, Simon
author_facet Peutzfeldt, Anne
Lussi, Adrian
Flury, Simon
author_sort Peutzfeldt, Anne
collection PubMed
description This study investigated the influence of light-curing at high irradiances on micromechanical properties of resin cements. Three dual-curing resin cements and a light-curing flowable resin composite were light-cured with an LED curing unit in Standard mode (SM), High Power mode (HPM), or Xtra Power mode (XPM). Maximum irradiances were determined using a MARC PS radiometer, and exposure duration was varied to obtain two or three levels of radiant exposure (SM: 13.2 and 27.2 J/cm(2); HPM: 15.0 and 30.4 J/cm(2); XPM: 9.5, 19.3, and 29.7 J/cm(2)) (n = 17). Vickers hardness (H (V)) and indentation modulus (E (IT)) were measured at 15 min and 1 week. Data were analyzed with nonparametric ANOVA, Wilcoxon-Mann-Whitney tests, and Spearman correlation analyses (α = 0.05). Irradiation protocol, resin-based material, and storage time and all interactions influenced H (V) and E (IT) significantly (p ≤ 0.0001). Statistically significant correlations between radiant exposure and H (V) or E (IT) were found, indicating that high-irradiance light-curing has no detrimental effect on the polymerization of resin-based materials (p ≤ 0.0021). However, one resin cement was sensitive to the combination of irradiance and exposure duration, with high-irradiance light-curing resulting in a 20% drop in micromechanical properties. The results highlight the importance of manufacturers issuing specific recommendations for the light-curing procedure of each resin cement.
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spelling pubmed-51648962017-01-02 Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements Peutzfeldt, Anne Lussi, Adrian Flury, Simon Biomed Res Int Research Article This study investigated the influence of light-curing at high irradiances on micromechanical properties of resin cements. Three dual-curing resin cements and a light-curing flowable resin composite were light-cured with an LED curing unit in Standard mode (SM), High Power mode (HPM), or Xtra Power mode (XPM). Maximum irradiances were determined using a MARC PS radiometer, and exposure duration was varied to obtain two or three levels of radiant exposure (SM: 13.2 and 27.2 J/cm(2); HPM: 15.0 and 30.4 J/cm(2); XPM: 9.5, 19.3, and 29.7 J/cm(2)) (n = 17). Vickers hardness (H (V)) and indentation modulus (E (IT)) were measured at 15 min and 1 week. Data were analyzed with nonparametric ANOVA, Wilcoxon-Mann-Whitney tests, and Spearman correlation analyses (α = 0.05). Irradiation protocol, resin-based material, and storage time and all interactions influenced H (V) and E (IT) significantly (p ≤ 0.0001). Statistically significant correlations between radiant exposure and H (V) or E (IT) were found, indicating that high-irradiance light-curing has no detrimental effect on the polymerization of resin-based materials (p ≤ 0.0021). However, one resin cement was sensitive to the combination of irradiance and exposure duration, with high-irradiance light-curing resulting in a 20% drop in micromechanical properties. The results highlight the importance of manufacturers issuing specific recommendations for the light-curing procedure of each resin cement. Hindawi Publishing Corporation 2016 2016-12-04 /pmc/articles/PMC5164896/ /pubmed/28044129 http://dx.doi.org/10.1155/2016/4894653 Text en Copyright © 2016 Anne Peutzfeldt et al. https://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Peutzfeldt, Anne
Lussi, Adrian
Flury, Simon
Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements
title Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements
title_full Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements
title_fullStr Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements
title_full_unstemmed Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements
title_short Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements
title_sort effect of high-irradiance light-curing on micromechanical properties of resin cements
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5164896/
https://www.ncbi.nlm.nih.gov/pubmed/28044129
http://dx.doi.org/10.1155/2016/4894653
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