RPD Review Questions

Answer to Question #76


The correct answer is

Incorrect. NO! NEVER!

Incorrect. The I-bar would lie in front of the axis of rotation and is a cast clasp. It would not release during function and would have the potential to torque the tooth.

Incorrect. Although the undercut is appropriate for an I-bar, a mesial rest cannot be used due to the occlusion and, if a distal rest is used, the cast I-bar would lie in front of the axis of rotation.

Correct. Since the occlusion precludes the use of a mesial rest, the rest must be moved to the distal. Virtually any type of clasp will place the retentive tip in front of the axis of rotation and flexibility of the clasp is of paramount importance---thus, wrought wire.