RPD Review Questions

Answer to Question #69

The correct answer isTRUE

In this case, there are normally undercuts on the mesial surfaces of the molars---due to the drifting. If only partial blockout is done on the mesial surfaces of the molars during framework fabrication, the rigid metal of the guide plates will slide into the undercuts and then the anterior part of the RPD is rotated downward into position. Now the posterior portion of the RPD cannot be dislodged unless the clasps on the premolars release first allowing the anterior portion of the RPD to move upward and forward.