What is the typical undercut size associated with a wrought wire clasp?

What is the typical undercut size associated with a wrought wire clasp?

• A. 0.01 inch
• B. 0.05 inch
• C. 0.10 inch
• D. 0.02 inch

Answer: (D)

Undercut dimensions determine how much the clasp can engage the tooth to resist dislodging forces. Wrought wire clasps are flexible, so they work best with a modest undercut that the wire can bite into without permanent bending. About 0.02 inch (0.5 mm) is the typical size used because it provides sufficient retention while allowing the thin, pliable wire to deflect and release without deforming. If the undercut is too small, retention will be poor and the denture may loosen easily. If the undercut is too large, the wire would need excessive deflection, increasing the risk of permanent deformation, loosening, or tooth movement during insertion and removal.

Undercut dimensions determine how much the clasp can engage the tooth to resist dislodging forces. Wrought wire clasps are flexible, so they work best with a modest undercut that the wire can bite into without permanent bending. About 0.02 inch (0.5 mm) is the typical size used because it provides sufficient retention while allowing the thin, pliable wire to deflect and release without deforming. If the undercut is too small, retention will be poor and the denture may loosen easily. If the undercut is too large, the wire would need excessive deflection, increasing the risk of permanent deformation, loosening, or tooth movement during insertion and removal.