Glass-ionomer cements are currently used for various dental applications including luting, liners, bases and direct restorations. Adhesive property to the tooth, less toxic effect to dental pulp, as well as their continuous release of fluoride are the main advantages of glass ionomer cements.
They consist of a sodium calcium aluminosilicate glass powder and an aqueous solution of a polyalkenoic acid. The single compounds react as soon as they are mixed together.
The aim of the investigation conducted in the Institute of Glass and Ceramics was to prepare water activated glass ionomer cements for restoration of the teeth.
An aluminosilicate glasses, in which calcium has been substituted by strontium and barium, were prepared by melting. Steel quenched pieces of glass and water-cooled granular frit were produced. Glass were ground and sieved to prepare <45 mm powder. Particle size analysis of glass powder was made by using the laser analyzer.
The polyacid powder was obtained by freeze drying of aqueous solution of polymer and grinding. Then the polymer was added as dry powder to the glass and the reaction of setting was initiated by addition of water. Specimens of water-activated glass ionomer cements prepared from various glasses and acrylic polyacid have been tested for setting time and compressive strength.
It was concluded that the obtained glasses could be used to produce water-activated glass ionomer cements for use in dentistry.

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