[Glass ionomer, current clinical indications in restorative dentistry].

The glass ionomer cements are a relatively new class of dental materials used for a variety of purposes, including cavity lining, restorations, cementation of casting, crown building and pit and fissure sealant. They offer two great advantages over most other materials release of fluoride and adhesion to dentin and enamel. Glass ionomer is very susceptible to dehydration and hydration, especially during the first 15 min and lesser extent the remaining 24 hours. Therefore, the use of rubber dam and a water proof varnish is critical to prevent loss of hardness and translucency.