RPD Review Questions

Answer to Question #163


The correct answer is

Incorrect. A mesial rest and an I-bar is the BEST choice.

Correct. A distal rest and cast circumferential clasp has the greatest potential for torquing the abutment during functional movement of the extension base.

Incorrect. Although the half and half clasp is not our first choice retainer, it is acceptable when lack of a facial undercut necessitates the use of a lingual undercut.

Incorrect. A mesial rest and modified T-bar is an acceptable clasp assembly when the undercut is on the distofacial surface and when there is no contraindication to the use of a bar (infrabulge) clasp.