Nicholson, John W. (2007) Water sorption/desorption in polyacid-modified composite resins for dentistry. Journal of Materials Science: Materials in Medicine, 19 (4). pp. 1713-1717. ISSN 0957-4530 (Print), 1573-4838 (Online) (doi:https://doi.org/10.1007/s10856-006-0106-x)

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Abstract

The water sorption and desorption behaviour of three commercial polyacid-modified composite resins used in clinical dentistry have been studied in detail. Cured specimens of each material were subjected to two successive water uptake cycles in an atmosphere of 93% relative humidity, with one intervening desorption cycle in a desiccating atmosphere over concentrated sulfuric acid. Specimens were found to absorb and desorb water according Fick's law until Mt/M(infinity) values of approximately 0.5. Diffusion rates for uptake varied between cycles, ranging from 2.37-4.53 x 10(-9 )cm(2) s(-1) for 1st cycle to 0.85-2.72 x 10(-8 )cm(2 )s(-1) for 2nd cycle. Desorption rates were similar to those for 2nd cycle sorption, and ranged from 0.86 to 5.47 x 10(-8 )cm(2 )s(-1). Equilibration times for 1st cycle water uptake were greater than for 2nd cycle sorption and for desorption and overall the behaviour of polyacid-modified composites in a high humidity atmosphere was similar to that of conventional composites in water. It is concluded that the hydrophilic components of the former do not bring about an enhanced rate of water transport.

Item Type:	Article
Additional Information:	[1] Published in Journal of Materials Science: Materials in Medicine, Volume 19, Issue 4, April 2008 - issue entitled Special Section: Selected Papers from the 21st European Conference on Biomaterials, Brighton, UK, 9-13 September 2007. Guest Editors: Andrew Lloyd and Matteo Santin.
Uncontrolled Keywords:	dental restorative materials, absorption, sorption, compomers
Subjects:	R Medicine > RK Dentistry
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Science (SCI)
Related URLs:	Publisher
Last Modified:	11 Feb 2020 14:59
URI:	http://gala.gre.ac.uk/id/eprint/2204

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