Dental Assistant Practice Exam 2026 - Free Dental Assistant Practice Questions and Study Guide

Dental amalgam is a commonly used restorative material in dentistry, primarily composed of a mixture of metals. The correct composition includes silver, tin, copper, mercury, and sometimes zinc.

Silver is added to enhance the strength and durability of the amalgam, giving it good properties for wear resistance. Tin contributes to the cohesiveness of the mixture and influences the setting reaction, playing a crucial role in the overall mechanical properties of the amalgam. Copper is included to improve corrosion resistance and the strength of the amalgam, reducing the risk of degradation over time. Mercury acts as the binder that combines these metals into a workable paste, which hardens upon setting.

The presence of zinc in some dental amalgams can further improve the resistance to corrosion, although it is not always included in every formulation. This composite nature allows dental amalgam to be an effective and reliable choice for various dental restorations. Understanding this composition is essential for dental professionals when considering the properties and suitability of dental materials for specific clinical situations.