Dental Amalgam

Dental Amalgam is a commonly used dental filling that has been used for over 150 years. It is a mixture of mercury with at least one other metal. Amalgam has many advantages over other restorative material, such as low cost, strength, durability, and bacteriostatic effects.

Amalgam is used in dentistry for a number of reasons. It is relatively easy to use and manipulate during placement; it remains soft for a short time so it can be packed to fill any irregular volume, and then forms a hard compound. Amalgam possesses greater longevity than other direct restorative materials, such as composite. On average, most amalgam restorations serve for 10 to 12 years, whereas resin-based composites serve for about half that time. However, with recent improvements in composite material science and a better understanding of the technique-sensitivity of placement, it should be noted that this difference is decreasing.

There are circumstances in which composite (white fillings) serves better than amalgam; when amalgam is not indicated, or when a more conservative preparation would be beneficial, composite is the recommended restorative material. These situations would include small occlusal restorations, in which amalgam would require the removal of a more sound tooth structure, as well as in “enamel sites beyond the height of contour.”

The American Dental Association Council on Scientific Affairs has concluded that both amalgam and composite materials are considered safe and effective for tooth restoration.

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Dental Amalgam FAQ

Is dental amalgam safe?
Yes. According to the American Dental Association, dental amalgam is considered a safe and effective material for restoring teeth.

Why is amalgam still used if white fillings are available?
Amalgam is strong, durable, and long-lasting, making it a reliable option for certain back teeth where chewing forces are higher.

How long do amalgam fillings last?
On average, amalgam fillings last about 10 to 12 years, though some may last longer depending on oral hygiene and bite forces.

Can amalgam fillings be replaced with white fillings?
Yes. Many patients choose to replace amalgam fillings with tooth-colored composite restorations for aesthetic or personal preference reasons.