HOSA Dental Terminology Practice

Which instrument is designed to carve amalgam on the occlusal surface?

1. Cleoid/discoid

2. Wooden wedge

3. Gutta percha

4. Amalgam well

The correct answer is: Cleoid/discoid

The cleoid/discoid instrument is specifically designed for carving amalgam on the occlusal surface. This instrument features a unique design with one end shaped like a cleoid (a pointed, sharp edge) and the other like a discoid (a round, flat surface). This dual functionality allows dental professionals to effectively shape and contour amalgam restorations after they have been placed in the cavity preparation. The cleoid end is particularly useful for creating detailed contours and grooves that mimic the natural anatomy of the tooth, while the discoid end helps to refine the overall surface. In contrast, wooden wedges are primarily used to hold matrices in place during dental procedures and do not serve the purpose of carving. Gutta percha is a material commonly used for root canal fillings, not for carving or shaping dental materials. An amalgam well is a container used to hold and mix amalgam before it is placed in the tooth but does not assist in the carving process post-application. Thus, the cleoid/discoid instrument stands out as the appropriate choice for carving amalgam.