Glass Ionomer Cement (IMAGE) University of Copenhagen - Niels Bohr Institute Caption Glass ionomer cement powder can be mixed with a liquid by hand without the use of special equipment and the material does not need to be illuminated with a lamp to harden. This is a great advantage in remote areas without electricity like in Africa, China or South America. Credit (Credit: Ola Jakup Joensen, NBI) Usage Restrictions (Credit: Ola Jakup Joensen, NBI) License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.