Final answer:
Glass Ionomer cement is the type that bonds directly with enamel, dentin, and metallic materials, offering chemical adhesion and fluoride release which aids in caries prevention.
Step-by-step explanation:
The type of cement that bonds directly with enamel, dentin, and metallic materials is Glass Ionomer cement. This type of dental cement is widely used due to its unique properties. It can chemically bond to both tooth structure and metallic materials, making it an excellent choice for a variety of dental applications, such as fillings, luting cements, and as a liner or base. Glass Ionomer cements release fluoride which can help in preventing further caries.