The kinetics of water loss from zinc phosphate and zinc polycarboxylate dental cements
Nicholson, John W. and Czarnecka, Beata (2008) 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)Full text not available from this repository.
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.
|Additional Information:|| 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
|School / Department / Research Groups:||School of Science|
School of Science > Department of Pharmaceutical, Chemical & Environmental Sciences
|Last Modified:||09 Aug 2012 14:43|
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