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Fillings. Fillings are used to repair a cavity in your tooth caused by decay. The most common type of filling is dental amalgam, made from a mixture of mercury and different metals. Dental amalgam fillings are often used on your back teeth as they are hard-wearing.
Amalgam is a combination of metals that has been the most popular and effective filling material used in dentistry for the last 150 years. Although it sometimes is called silver amalgam, amalgam actually consists of a combination of metals. These include silver, mercury, tin and copper.ental amalgam is a common material used to fill cavities. Fillings made with amalgam also are known as silver fillings. Over the years, concerns have been raised about the use of amalgam because it contains mercury. Here are answers to some common questions about dental amalgam.