Dental cements are materials used in dentistry to bond various components, such as crowns, bridges, and fillings, to teeth. They provide a strong adhesive that helps restore the function and appearance of teeth while also protecting them from decay and damage. These cements come in different types, including glass ionomer, resin-modified glass ionomer, and zinc oxide-eugenol, each with unique properties suited for specific dental applications. The choice of cement depends on factors like the location of the restoration, the materials used, and the desired strength and durability.