A Strontium-based Glass Ionomer: All GC Gold Label Glass Ionomer contains strontium glass.&The strontium glass provides good radiopacity and snapset& characteristics, unanimously preferred by clinicians around the world. Interestingly, strontium will mimic calcium& in the formation of strontium hydroxyapatite and strontium& fluoroapatite to affect internal& remineralization within the& tooth structure. Surface Strengthening Effect: Research has shown that a strontium-based glass ionomer placed in calcium-containing environment (saliva) will result in calcium ion diffusing into the glass ionomer&surface achieving a surface strengthening effect. All GC& Gold Label Glass Ionomer strengthens over time in saliva. A Consistent Predictable Seal: