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Young's Modulus and Degree of Conversion of Different Combination of Light-Cure Dental Resins

OBJECTIVES: To evaluate Young's modulus and degree of conversion of several combinations of bisGMA, UEDMA, TEGDMA light-cure dental resin. METHODS: Young's modulus and DC% were studied for 21 different resin combinations of bisGMA, TEGDMA and UEDMA. Small universal testing machine and phot...

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Autores principales: Emami, N, Söderholm, KJ
Formato: Texto
Lenguaje:English
Publicado: Bentham Open 2009
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2761673/
https://www.ncbi.nlm.nih.gov/pubmed/19838309
http://dx.doi.org/10.2174/1874210600903010202
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author Emami, N
Söderholm, KJ
author_facet Emami, N
Söderholm, KJ
author_sort Emami, N
collection PubMed
description OBJECTIVES: To evaluate Young's modulus and degree of conversion of several combinations of bisGMA, UEDMA, TEGDMA light-cure dental resin. METHODS: Young's modulus and DC% were studied for 21 different resin combinations of bisGMA, TEGDMA and UEDMA. Small universal testing machine and photo-calorimetry were used for the tests. The results were evaluated using ANOVA and Duncan's multiple range tests and regular t-test. RESULTS: Young's modulus varied between 2.37±0.2 GPa (100% TEGDMA) and 4.15±0.2 GPa (100% bisGMA). By adding TEGDMA to bisGMA or UEDMA, the Young's modulus decreased significantly (p<0.05). Degree of conversion was significantly (p<0.05) higher when the wt% of TEGDMA was high in the mixtures than for highly concentrated bis-GMA (resin mixtures with TEGDMA in comparison to mixture with bisGMA had higher degree of conversion). DC% was significantly higher (p<0.05) for binary mixtures of UEDMA and TEGDMA, and significantly lower for 100 wt% bis-GMA (p<0.05). The DC% values were between 53.1%±0.9% (100% bisGMA) and 85.6%±1% (80% UEDMA-20% TEGDMA). The concentration of bisGMA, in the monomer mixture, affected DC% and Young's modulus oppositely. CONCLUSIONS: The differences in the values for DC% were mostly justified by the differences in the molecular structures of the different monomers. It was also revealed that higher DC% does not always result in a higher Young's modulus, because molecular and network structural parameters play major roles in the final physical properties of the mixtures.
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spelling pubmed-27616732009-10-16 Young's Modulus and Degree of Conversion of Different Combination of Light-Cure Dental Resins Emami, N Söderholm, KJ Open Dent J Article OBJECTIVES: To evaluate Young's modulus and degree of conversion of several combinations of bisGMA, UEDMA, TEGDMA light-cure dental resin. METHODS: Young's modulus and DC% were studied for 21 different resin combinations of bisGMA, TEGDMA and UEDMA. Small universal testing machine and photo-calorimetry were used for the tests. The results were evaluated using ANOVA and Duncan's multiple range tests and regular t-test. RESULTS: Young's modulus varied between 2.37±0.2 GPa (100% TEGDMA) and 4.15±0.2 GPa (100% bisGMA). By adding TEGDMA to bisGMA or UEDMA, the Young's modulus decreased significantly (p<0.05). Degree of conversion was significantly (p<0.05) higher when the wt% of TEGDMA was high in the mixtures than for highly concentrated bis-GMA (resin mixtures with TEGDMA in comparison to mixture with bisGMA had higher degree of conversion). DC% was significantly higher (p<0.05) for binary mixtures of UEDMA and TEGDMA, and significantly lower for 100 wt% bis-GMA (p<0.05). The DC% values were between 53.1%±0.9% (100% bisGMA) and 85.6%±1% (80% UEDMA-20% TEGDMA). The concentration of bisGMA, in the monomer mixture, affected DC% and Young's modulus oppositely. CONCLUSIONS: The differences in the values for DC% were mostly justified by the differences in the molecular structures of the different monomers. It was also revealed that higher DC% does not always result in a higher Young's modulus, because molecular and network structural parameters play major roles in the final physical properties of the mixtures. Bentham Open 2009-10-01 /pmc/articles/PMC2761673/ /pubmed/19838309 http://dx.doi.org/10.2174/1874210600903010202 Text en © Emami and Söderholm.; Licensee Bentham Open. http://creativecommons.org/licenses/by-nc/3.0/ This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
spellingShingle Article
Emami, N
Söderholm, KJ
Young's Modulus and Degree of Conversion of Different Combination of Light-Cure Dental Resins
title Young's Modulus and Degree of Conversion of Different Combination of Light-Cure Dental Resins
title_full Young's Modulus and Degree of Conversion of Different Combination of Light-Cure Dental Resins
title_fullStr Young's Modulus and Degree of Conversion of Different Combination of Light-Cure Dental Resins
title_full_unstemmed Young's Modulus and Degree of Conversion of Different Combination of Light-Cure Dental Resins
title_short Young's Modulus and Degree of Conversion of Different Combination of Light-Cure Dental Resins
title_sort young's modulus and degree of conversion of different combination of light-cure dental resins
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2761673/
https://www.ncbi.nlm.nih.gov/pubmed/19838309
http://dx.doi.org/10.2174/1874210600903010202
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