[Amalgam. XI. Glass-ionomer as a possible substitute of amalgam: longevity]

The clinical use of glass-ionomer increases, also for restorative goals. The longevity of glass ionomer restorations is among others determined by premature contact with saliva and by acid erosion. The adherence to the dental hard tissues may be increased by acid pretreatment. The longevity data presented here indicate that glass ionomer restorations do not last as long as amalgam restorations. In the deciduous teeth the material seems to be a more acceptable substitute for amalgam. The same holds true for restorations which are not submitted to stress, such as class V.