What type of instrument is used for packing retraction cords?

The correct option highlights the specific tool that is designed for packing retraction cords effectively. A spoon-like packing condenser is a dental instrument that features a rounded, spoon-shaped end which allows for the precise placement and compression of materials within the dental sulcus. This design is particularly beneficial for ensuring that the retraction cord fits snugly along the prepared contour of the tooth, providing accurate gingival retraction.

This instrument helps dentists create a clean working area for procedures like crown impressions by temporarily pushing the gum tissue away from the teeth. Its shape ensures that pressure can be applied evenly without damaging the delicate gingival tissue.

Other tools listed, such as scalpels, chisels, and explorers, serve different functions within dental care. Scalpels are primarily for cutting soft tissue, chisels are used for shaping and removing enamel and dentin during cavity preparations, and explorers are designed for detecting cavities or abnormalities in the tooth surface. These instruments do not provide the specific functionality needed for retraction cord placement. Thus, the packing condenser is the appropriate choice for this particular task.