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Young's modulus and degree of conversion of different combination of light-cure dental resins
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
University of Florida, Gainesville.
2009 (English)In: Open Dentistry Journal, ISSN 1874-2106, E-ISSN 1874-2106, Vol. 3, 202-207 p.Article in journal (Refereed) Published
Abstract [en]

Objectives: To evaluate Young's modulus and degree of conversion of several combinations of bisGMA,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 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 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 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.

Place, publisher, year, edition, pages
2009. Vol. 3, 202-207 p.
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-14437DOI: 10.2174/1874210600903010202Local ID: dcb8cf60-9c8b-11de-a77c-000ea68e967bOAI: oai:DiVA.org:ltu-14437DiVA: diva2:987410
Note
Validerad; 2009; 20090908 (emami)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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