Fillings can be made of amalgam, gold, composite resin, glass ionomers and even porcelain. Amalgam and composite resin are the best-known materials used in fillings.
What should you know about these materials?
Amalgam
Amalgam fillings have been used to restore teeth with cavities or decay for over 150 years. An amalgam filling is comprised of several metals, including elemental mercury, silver, tin and copper. Because of the composition of amalgam, an amalgam filling appears silver in the mouth.
Amalgam fillings are can withstand years of pressure, biting and chewing. On average, these fillings last over 10 years. However, many individuals opt for less noticeable filling materials. Additionally, some individuals have sensitivity to the various metals used in amalgam fillings.
Composite Resin
Composite resin has become one of the most popular materials for dental fillings due to its natural, toothlike appearance. It's also easier to apply to the tooth and requires less tooth preparation than other filling materials. Unfortunately, composite resin doesn't last as long as amalgam. A composite resin filling generally lasts around 5-8 years--roughly half the lifespan of amalgam.