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The interaction of zinc oxide-based dental cements with aqueous solutions of potassium fluoride

The interaction of zinc oxide-based dental cements with aqueous solutions of potassium fluoride

Pawluk, K., Booth, S.E., Coleman, N.J. and Nicholson, J.W. (2008) The interaction of zinc oxide-based dental cements with aqueous solutions of potassium fluoride. Journal of Materials Science: Materials in Medicine, 19 (9). pp. 3035-3039. ISSN 0957-4530 (Print), 1573-4838 (Online) (doi:10.1007/s10856-008-3443-0)

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Abstract

The ability of zinc oxide-based dental cements (zinc phosphate and zinc polycarboxylate) to take up fluoride from aqueous solution has been studied. Only zinc phosphate cement was found to take up any measurable fluoride after 5 h exposure to the solutions. The zinc oxide filler of the zinc phosphate also failed to take up fluoride from solution. The key interaction for this uptake was thus shown to involve the phosphate groups of the set cement. However, whether this took the form of phosphate/fluoride exchange, or the formation of oxyfluoro-phosphate groups was not clear. Fluoride uptake followed radicaltime kinetics for about 2 h in some cases, but was generally better modelled by the Elovich equation, dq(t)/dt = alpha exp(-beta q(t)). Values for alpha varied from 3.80 to 2.48 x 10(4), and for beta from 7.19 x 10(-3) to 0.1946, though only beta showed any sort of trend, becoming smaller with increasing fluoride concentration. Fluoride was released from the zinc phosphate cements in processes that were diffusion based up to M(t)/M(infinity) of about 0.4. No further release occurred when specimens were placed in fresh volumes of deionised water. Only a fraction of the fluoride taken up was re-released, demonstrating that most of the fluoride taken up becomes irreversibly bound within the cement.

Item Type: Article
Uncontrolled Keywords: glass-ionomer cements, acidic conditions, release, kinetics, sorption, ions, dissolution
Subjects: R Medicine > RK Dentistry
Faculty / Department / Research Group: Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Related URLs:
Last Modified: 17 Oct 2016 09:10
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/2212

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