Amalgam

Amalgam is a metallic restorative material composed of a mixture of mercury with a powdered alloy containing silver, tin, copper, and sometimes zinc or other trace metals. When the mercury is combined with the alloy powder in a process called trituration, the resulting material is a pliable mass that can be condensed into a prepared tooth cavity where it hardens through a crystallization process over the following twenty-four hours. Amalgam has been used in restorative dentistry for over 150 years and is valued for its exceptional durability, compressive strength, wear resistance, and longevity in posterior teeth that bear significant occlusal forces. Despite the shift toward tooth-colored composite materials driven by patient aesthetic preferences, amalgam remains a clinically proven and cost-effective option for large posterior restorations.

The use of dental amalgam has generated ongoing discussion within the dental profession and regulatory agencies regarding the safety of its mercury content. Major health organizations, including the American Dental Association and the World Health Organization, have affirmed that dental amalgam is safe for the general population, though certain groups such as pregnant women and patients with mercury allergies may warrant alternative materials. Some jurisdictions have enacted or proposed restrictions on amalgam use based on environmental concerns related to mercury disposal rather than patient safety. These regulatory developments have accelerated the trend toward mercury-free restorative materials, and many practices have transitioned entirely to composite resins, glass ionomers, and ceramic restorations.

In billing workflows, amalgam restorations are coded under a distinct set of CDT procedure codes that are separate from composite restoration codes, with classification based on tooth type (primary or permanent) and the number of surfaces involved. Reimbursement rates for amalgam codes are generally lower than those for comparable composite codes, which creates a financial consideration in material selection. Some dental benefit plans apply a downgrade policy in which claims submitted for posterior composite restorations are reimbursed at the lower amalgam fee schedule, leaving the patient responsible for the difference. Billing teams should identify plans with downgrade provisions during eligibility verification so that patients can be informed of their out-of-pocket costs before treatment.