ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 65, (2) 120 - 124 (2021)

Klos Jacek 1,2, Czarnecka Beata 2, Nicholson John W. 3
1 Department of Physical Chemistry, Faculty of Chemistry, Adam Mickiewicz University of Poznan, Ul. Uniwersytetu Poznanskiego 8, 61-614 Poznan, Poland.
2 Department of Biomaterials and Experimental Dentistry, Dental Institute, University of Medical Sciences, ul Bukowska 70, 60-812 Poznan, Poland.
3 Bluefield Centre for Biomaterials, 67-68 Hatton Garden, London, EC1N 8JY, United Kingdom and Dental Physical Sciences, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, Mile End Road, London, E1 4NS, UK.

Keywords: Glass-ionomer cements, Buffer solutions, Mass gain, Compressive strength

Four brands of glass-ionomer cement (Fuji IX GP, Riva, Ketac Molar and Chemfil Superior) have been stored in aqueous media comprising distilled water, or phosphate buffer solutions at pH 5.42, 6.91 and 8.13 at 37°C for 7 days. Cements differed widely in their response. All took up small amounts of water in distilled water, and had high compressive strengths. Ketac Molar showed no differences in any of the buffer solutions, but gained small amounts in mass, and showed high compressive strength in all storage media. Conversely Chemfil Superior was adversely affected by all three buffers, and Fuji IX and Riva were adversely affected by the buffers at pH 6.91 and 8.31. The reasons for these differences were not clear, but the fact that the buffer closest to neutral (pH 6.91) caused significant damage to three of the cements studied shows that this is not a simple effect of pH.

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doi: 10.13168/cs.2021.0010
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