Nicholson, John W. and Czarnecka, Beata (2007) The kinetics of water loss from zinc phosphate and zinc polycarboxylate dental cements. Journal of Materials Science: Materials in Medicine, 19 (4). pp. 1719-1722. ISSN 0957-4530 (Print), 1573-4838 (Online) (doi:10.1007/s10856-007-3269-1)

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Abstract

The water desorption behaviour of three different zinc oxide dental cements (two polycarboxylates, one phosphate) has been studied in detail. Disc-shaped specimens of each material were prepared and allowed to lose water by being subjected to a low humidity desiccating atmosphere over concentrated sulfuric acid. In all three cements, water loss was found to follow Fick's second law for at least 6 h (until M(t)/M(infinity) values were around 0.5), with diffusion coefficients ranging from 6.03 x 10(-8 )cm(2 )s(-1) (for the zinc phosphate) to 2.056 x 10(-7 )cm(2 )s(-1) (for one of the zinc polycarboxylates, Poly F Plus). Equilibration times for desorption were of the order of 8 weeks, and equilibrium water losses ranged from 7.1% for zinc phosphate to 16.9% and 17.4% for the two zinc polycarboxylates.

Item Type:	Article
Additional Information:	[1] In Journal of Materials Science: Materials in Medicine, 2008, volume 19, issue 4 - the 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:	glass-ionomer, dental cement, water loss
Subjects:	Q Science > QD Chemistry 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:	13 Feb 2020 09:04
URI:	http://gala.gre.ac.uk/id/eprint/2206

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