TITLE

The kinetics of water loss from zinc phosphate and zinc polycarboxylate dental cements

AUTHOR(S)
Nicholson, John W.; Czarnecka, Beata
PUB. DATE
April 2008
SOURCE
Journal of Materials Science: Materials in Medicine;Apr2008, Vol. 19 Issue 4, p1719
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
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 Mt/M∞ values were around 0.5), with diffusion coefficients ranging from 6.03 × 10−8 cm2 s−1 (for the zinc phosphate) to 2.056 × 10−7 cm2 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.
ACCESSION #
31244636

 

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