Which one of the following is an intracoronal cast metal restoration?

An intracoronal cast metal restoration refers to a type of dental restoration that is designed to fit within the confines of the tooth's crown portion. The correct option is an inlay, which is custom-made and crafted outside the tooth, typically from metal, ceramic, or composite resin. It is specifically designed to fit inside the cavity of a prepared tooth, thus seating entirely within the enamel and dentin walls.

Inlays are beneficial for their durability and are often used to restore teeth that have moderate decay or damage while preserving as much of the tooth structure as possible. By providing a strong and stable restoration that bonds to the tooth, inlays can enhance both the functionality and aesthetics of the tooth.

Other options do not match the definition of an intracoronal cast metal restoration. For example, a partial coverage crown, while it covers part of a tooth, is not intracoronal as it extends over the tooth structure. A composite resin filling, although restorative, is a direct material placed within the cavity and does not involve casting. A complete crown fully encases the tooth rather than fitting inside it. Therefore, the inlay stands out as the correct response, fitting the criteria of being a cast metal restoration that is placed within the coronal portion of