RPD Review Questions

Answer to Question #128

The correct answer is

Correct. This is the general rule. It fits with our preferred clasp assembly of mesial rest, distal guide plate, and I-bar retentive arm. There are certainly many exceptions to the rule. You should know what they are and the reasons for their selection.

Incorrect. This would not be your first choice and would not be the general rule. However, there are several exceptions to the general rule. Do you know what they are?

Incorrect. There could be instances where rests are placed on both the mesial and distal occlusal surfaces but it would certainly not be the general rule. (An example where both would be used would be the 1/2 and 1/2 clasp).

Incorrect. There might be occasions when a rest is not placed on the abutment next to an extension, but this is certainly NOT the general rule.