RPD Review Questions

Answer to Question #187


The correct answer is

The combination clasp is most commonly used for extension RPDs when

1. a tissue undercut below the terminal abutment precludes the use of a bar clasp

2. the mesial tilt of the terminal abutment would cause the guide plate to pre-empt the mesial rest in an I-bar clasp assembly

3. a retainer is placed on a tooth that lies bodily in front of the axis of rotation