Final answer:
The cement that directly bonds with enamel, dentin, and metallic material is Composite resin cement, which is known for its compatibility with dental tissues and restorative materials. It is used for its adhesive properties and ability to create aesthetic and durable dental restorations.
Step-by-step explanation:
The cement that bonds directly with enamel, dentin, and metallic material is D) Composite resin cement. Composite resin cement is widely used in dentistry for its superior aesthetic qualities and its ability to bond to both the natural tooth structure, which includes enamel and dentin, and to metal. It's part of a category of dental cements known for their adhesive properties and compatibility with dental tissues and restorative materials.
Understanding the structure of the tooth can help in comprehending why certain materials, like composite resin cement, are effective. The crown of a tooth is the portion above the gum covered with enamel, the hardest substance in the body. Beneath the enamel layer is dentin, a bone-like tissue. The area of the pulp cavity that extends through the root is the root canal, and in the root, the dentin is covered by cementum. Dental cements like composite resin cement are formulated to work harmoniously with these structures, providing durable and stable dental restorations.