What type of clasp is used with an undercut measurement of 0.01?

The correct choice is a cast clasp because it is specifically designed to fit into undercuts that are typically found in the tooth surface. An undercut measurement of 0.01 indicates a relatively small undercut, which a cast clasp can adequately engage without compromising the retention of a removable partial denture. Cast clasps are made from metal and can be produced to provide a precise, stable fit around the tooth anatomy, ensuring reliable retention.

While wrought wire clasps can also work for undercuts, they are generally more flexible and are typically used for deeper undercuts or for areas requiring more adaptability. The choice of a cast clasp for a 0.01 undercut measurement reflects a practical application of their strength and rigidity, which is optimal for precise retention.

Other types of clasps, such as composite and acrylic clasps, do not offer the same degree of retention in situations involving minimal undercuts, particularly when compared to metal alternatives like cast clasps. These materials may not provide the necessary strength and support required in certain clinical situations.