Resin Ionomer Cement
A combination of glass-ionomer and composite resin, these dental fillings are a mixture of glass, an organic acid, and resin polymer that harden when light cured.
Porcelain fillings are hard, but can cause wear on opposing teeth. They are brittle and are not always recommended for molar fillings.
Gold fillings have excellent durability, wear well, and do not cause excessive wear to the opposing teeth, but they do conduct heat and cold, which can be irritating.
There are two categories of gold fillings – cast gold fillings (gold inlays and onlays) made with 14 or 18 ct gold, and gold foil made with pure 24 ct gold that is burnished layer.