Dental Assistant Practice Exam

Zinc is primarily included in dental amalgam to reduce oxidation. When amalgam components are mixed, particularly with elemental mercury, oxidation can occur, which affects the overall performance and longevity of the amalgam restoration. By incorporating zinc, the material is better protected against oxidation, leading to improved working properties and stability of the amalgam over time. This reduces the potential formation of zinc oxide, a byproduct of the reaction that can compromise the amalgam's effectiveness. In contrast, options pertaining to color, durability, or flow do not represent the primary role that zinc plays in amalgam. While they may be affected indirectly by the presence of zinc, the chief benefit is related to its protective qualities against oxidation during the setting and application processes.