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Effect of LED and Argon Laser on Degree of Conversion and Temperature Rise of Hybrid and Low Shrinkage Composite Resins

OBJECTIVES: Different light curing units are used for polymerization of composite resins. The aim of this study was to evaluate the degree of conversion (DC) and temperature rise in hybrid and low shrinkage composite resins cured by LED and Argon Laser curing lights. MATERIALS AND METHODS: DC was me...

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Autores principales: Pahlevan, Ayob, Tabatabaei, Masumeh Hasani, Arami, Sakineh, Valizadeh, Sara
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Bentham Open 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5074004/
https://www.ncbi.nlm.nih.gov/pubmed/27843507
http://dx.doi.org/10.2174/1874210601610010538
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author Pahlevan, Ayob
Tabatabaei, Masumeh Hasani
Arami, Sakineh
Valizadeh, Sara
author_facet Pahlevan, Ayob
Tabatabaei, Masumeh Hasani
Arami, Sakineh
Valizadeh, Sara
author_sort Pahlevan, Ayob
collection PubMed
description OBJECTIVES: Different light curing units are used for polymerization of composite resins. The aim of this study was to evaluate the degree of conversion (DC) and temperature rise in hybrid and low shrinkage composite resins cured by LED and Argon Laser curing lights. MATERIALS AND METHODS: DC was measured using FTIR spectroscopy. For measuring temperature rise, composite resin samples were placed in Teflon molds and cured from the top. The thermocouple under samples recorded the temperature rise. After initial radiation and specimens reaching the ambient temperature, reirradiation was done and temperature was recorded again. Both temperature rise and DC data submitted to one-way ANOVA and Tukey-HSD tests (5% significance). RESULTS: The obtained results revealed that DC was not significantly different between the understudy composite resins or curing units. Low shrinkage composite resin showed a significantly higher temperature rise than hybrid composite resin. Argon laser caused the lowest temperature rise among the curing units. CONCLUSION: Energy density of light curing units was correlated with the DC. Type of composite resin and light curing unit had a significant effect on temperature rise due to polymerization and curing unit, respectively.
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spelling pubmed-50740042016-11-14 Effect of LED and Argon Laser on Degree of Conversion and Temperature Rise of Hybrid and Low Shrinkage Composite Resins Pahlevan, Ayob Tabatabaei, Masumeh Hasani Arami, Sakineh Valizadeh, Sara Open Dent J Article OBJECTIVES: Different light curing units are used for polymerization of composite resins. The aim of this study was to evaluate the degree of conversion (DC) and temperature rise in hybrid and low shrinkage composite resins cured by LED and Argon Laser curing lights. MATERIALS AND METHODS: DC was measured using FTIR spectroscopy. For measuring temperature rise, composite resin samples were placed in Teflon molds and cured from the top. The thermocouple under samples recorded the temperature rise. After initial radiation and specimens reaching the ambient temperature, reirradiation was done and temperature was recorded again. Both temperature rise and DC data submitted to one-way ANOVA and Tukey-HSD tests (5% significance). RESULTS: The obtained results revealed that DC was not significantly different between the understudy composite resins or curing units. Low shrinkage composite resin showed a significantly higher temperature rise than hybrid composite resin. Argon laser caused the lowest temperature rise among the curing units. CONCLUSION: Energy density of light curing units was correlated with the DC. Type of composite resin and light curing unit had a significant effect on temperature rise due to polymerization and curing unit, respectively. Bentham Open 2016-09-30 /pmc/articles/PMC5074004/ /pubmed/27843507 http://dx.doi.org/10.2174/1874210601610010538 Text en © Pahlevan et al.; Licensee Bentham Open https://creativecommons.org/licenses/by/4.0/legalcode This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
spellingShingle Article
Pahlevan, Ayob
Tabatabaei, Masumeh Hasani
Arami, Sakineh
Valizadeh, Sara
Effect of LED and Argon Laser on Degree of Conversion and Temperature Rise of Hybrid and Low Shrinkage Composite Resins
title Effect of LED and Argon Laser on Degree of Conversion and Temperature Rise of Hybrid and Low Shrinkage Composite Resins
title_full Effect of LED and Argon Laser on Degree of Conversion and Temperature Rise of Hybrid and Low Shrinkage Composite Resins
title_fullStr Effect of LED and Argon Laser on Degree of Conversion and Temperature Rise of Hybrid and Low Shrinkage Composite Resins
title_full_unstemmed Effect of LED and Argon Laser on Degree of Conversion and Temperature Rise of Hybrid and Low Shrinkage Composite Resins
title_short Effect of LED and Argon Laser on Degree of Conversion and Temperature Rise of Hybrid and Low Shrinkage Composite Resins
title_sort effect of led and argon laser on degree of conversion and temperature rise of hybrid and low shrinkage composite resins
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5074004/
https://www.ncbi.nlm.nih.gov/pubmed/27843507
http://dx.doi.org/10.2174/1874210601610010538
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