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

Nicholson, John W.; Czarnecka, Beata
April 2008
Journal of Materials Science: Materials in Medicine;Apr2008, Vol. 19 Issue 4, p1719
Academic Journal
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.


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