What is amalgam? Which amalgam is used in the filling of teeth?

The alloy in which first metal is mercury, that alloy is known as amalgam. Uses: Dental amalgam is a mixture of mercury and a silver-tin alloy and is used for fillings in teeth. Amalgam fillings are often known as "silver fillings." Dental amalgam is a mixture of mercury, silver, tin and copper. Mercury, which makes up about 50% of the compound, binds the metals together to provide a strong, durable filling.