Tandrestaureringsmaterialer indeholder en mængde forskellige stoffer med ulige biologiske egenskaber. I mundhulen udsættes materialerne for både mekaniske, kemiske, mikrobielle og enzymatiske påvirkninger, og substanser kan frigives fra materialerne

Gold inlays have for a long time been known as high quality restorations. Since dental amalgam is no longer applicable as filling material in Norway, the need for gold inlays has expanded, especially in patients having high chewing force and tooth abrasions who need replacement of their old amalgam fillings.