Effect of Photoinitiator System and Water Content on Dynamic Mechanical Properties of a Light-cured bisGMA/HEMA Dental Resin

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Issue Date
2010-01-15Author
Park, Jonggu
Ye, Qiang
Topp, Elizabeth M.
Misra, Anil
Kieweg, Sarah L.
Spencer, Paulette
Publisher
Wiley
Type
Article
Article Version
Scholarly/refereed, author accepted manuscript
Rights
This is the peer reviewed version of the following article: Park, J., Ye, Q., Topp, E. M., Misra, A., Kieweg, S. L. and Spencer, P. (2010), Effect of photoinitiator system and water content on dynamic mechanical properties of a light-cured bisGMA/HEMA dental resin. J. Biomed. Mater. Res., 93A: 1245–1251. doi:10.1002/jbm.a.32617, which has been published in final form at http://doi.org/10.1002/jbm.a.32617. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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Show full item recordAbstract
The selection of an appropriate photoinitiator system is critical for efficient polymerization of dental resins with satisfactory mechanical and physical properties. The purpose of this study was to evaluate the influence of adding an iodonium salt to two-component photoinitiator systems. Four photoinitiator systems were included in a model bisGMA/HEMA resin and used to prepare samples at different water contents; the dynamic mechanical properties and the final degree of conversion of the samples were then characterized. Addition of the iodonium salt to the two-component photoinitiator systems increased the final degree of conversion, glass transition temperature, rubbery modulus, and crosslink density. The photoinitiator system containing ethyl-4-(dimethylamino) benzoate as a coinitiator and the iodonium salt exhibited the highest rubbery modulus. The enhanced properties in the presence of the iodonium salt can be attributed to the production of an active phenyl radical with regeneration of the original camphorquinone, which may increase the compatibility between monomers and initiators, especially in the presence of water. The results support the hypothesis that a photoinitiator system containing an iodonium salt can increase both mechanical properties and final conversion of model resin polymerized in the presence of water. © 2009 Wiley Periodicals, Inc. J Biomed Mater Res 2010
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Citation
Park, J., Ye, Q., Topp, E. M., Misra, A., Kieweg, S. L. and Spencer, P. (2010), Effect of photoinitiator system and water content on dynamic mechanical properties of a light-cured bisGMA/HEMA dental resin. J. Biomed. Mater. Res., 93A: 1245–1251. doi:10.1002/jbm.a.32617
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