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 secure dental restorations in place, ensuring they function properly and maintain aesthetics. These cements come in different types, including glass ionomer, resin-modified glass ionomer, and zinc phosphate, each with unique properties suited for specific dental applications. The choice of cement depends on factors like the type of restoration, the location in the mouth, and the desired strength and durability.