Cargando…
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...
Autores principales: | , |
---|---|
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 |
_version_ | 1782172845018710016 |
---|---|
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. |
format | Text |
id | pubmed-2761673 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2009 |
publisher | Bentham Open |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT emamin youngsmodulusanddegreeofconversionofdifferentcombinationoflightcuredentalresins AT soderholmkj youngsmodulusanddegreeofconversionofdifferentcombinationoflightcuredentalresins |