Identify a common material used for dental restorations.

Dental amalgam is a commonly used material for dental restorations due to its durability and strength. It is an alloy typically composed of mercury, silver, tin, copper, and sometimes zinc, which solidifies into a hard material suitable for filling cavities and restoring tooth structure. Its ability to withstand the forces of chewing and grinding makes it a reliable choice for posterior teeth, where greater strength is required.

In contrast, dental floss is primarily a preventive tool used for maintaining oral hygiene by removing plaque and food particles between teeth. Orthodontic wire is utilized in braces and related appliances for correcting misaligned teeth and jaws, not for restorative purposes. Preventive sealants are applied to the chewing surfaces of teeth to prevent cavities but are not considered restorative materials. Thus, dental amalgam stands out as the appropriate choice for dental restorations due to its essential characteristics and applications in clinical practice.