RPD Review Questions

Answer to Question #54


The best answer is

Incorrect. Due to the mesiolingual tilt of the tooth, it is unlikely that there will be a usable distolingual undercut.

Incorrect. The mesiolingual I-bar would be appropriate EXCEPT that there is a severe tissue undercut. In this instance, the I-bar would stand out in the floor of the mouth and would have significant potential for irritating the tongue.

Correct. The ring clasp is the best selection because there is a severe tissue undercut that would cause a mesiolingual I-bar to stand out in the floor of the mouth and irritate the tongue. The buccal portion of the ring clasp must be heavy enough to be rigid and strong, and an auxiliary distal rest should be used.

Incorrect. Due to the mesiolingual tilt of the tooth, it is unlikely that there will be a usable distolingual undercut. In addition, there is no reason to use a WW clasp in this situation.