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The influence of alkali metal chlorides on the loss of water from glass-ionomer dental cements

The influence of alkali metal chlorides on the loss of water from glass-ionomer dental cements

Nicholson, John W. (2009) The influence of alkali metal chlorides on the loss of water from glass-ionomer dental cements. Ceramics-Silikáty, 53 (1). pp. 1-4. ISSN 0862-5468

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Abstract

The water loss behaviour of a clinical glass-ionomer dental cement has been studied with and without the addition of alkali metal chlorides. Dehydrating conditions were provided by placing specimens in a desiccator over concentrated sulphuric acid. Cements were prepared using either pure water or an aqueous solution of metal chloride (LiCl, NaCl, KCl) at 1.0 mol/dm(3). In addition, NaCl at 0.5 mol/dm(3) was also used to fabricate cements. Disc-shaped specimens of size 6 mm diameter x 2 mm thickness were made, six performulation, and cured at 37 degrees C for 1 hour They were then exposed to desiccating conditions, and the mass measured at regular intervals. All formulations were found to lose water in a diffusion process that equilibrated after approximately 3 weeks. Diffusion coefficients ranged from 2.27 (0.13) x 10(9) with no additive to 1.85 (0.07) x 10(9) m(2)/s with 1.0 mol/dm(3) KCl. For the salts, diffusion coefficients decreased in the order LiCl > NaCl > KCl. There was no statistically significant difference between the diffusion coefficients for 1.0 and 0.5 mol/dm(3) NaCl. For all salts at 1.0 mol/dm(3) and also additive-free cements, equilibrium losses were, with statistical limits, the same, ranging from 6.23 to 6.34%. On the other hand, 0.5 mol/dm(3) NaCl lost significantly more water 7.05%.

Item Type: Article
Additional Information: [1] Assisted by an EU-funded “Erasmus” exchange placement at the University of Greenwich.
Uncontrolled Keywords: glass-ionomer cement, water loss, diffusion, alkali metal chlorides
Subjects: R Medicine > RK Dentistry
Q Science > QD Chemistry
R Medicine > RS Pharmacy and materia medica
Faculty / Department / Research Group: Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Related URLs:
Last Modified: 08 Dec 2016 15:56
URI: http://gala.gre.ac.uk/id/eprint/2085

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