What indirect restoration covers one or more cusps and is cemented in place?

• A. Crown
• B. Onlay
• C. Inlay
• D. Denture

Answer: (B)

Onlays extend over one or more cusps and are cemented in place. This type of indirect restoration is made outside the mouth and then bonded to the prepared tooth to restore occlusal anatomy while preserving as much natural tooth structure as possible. It differs from an inlay, which fits within the inner walls and doesn’t reach the cusps; a crown, which covers the entire visible part of the tooth including all cusps; and a denture, which is a removable replacement appliance. Onlays are chosen when cusp coverage is needed for strength and occlusion without full crown coverage, and they can be made from metal, ceramic, or resin and bonded with dental cement.