RPD Review Questions

Questions 151-160

Question #151

Which of the following clasp assemblies utilize a primary rest and an auxiliary rest?

RPA clasp

Ring clasp

Infrabulge clasp

Extended arm clasp


Question 152

True or False

In a circumferential clasp assembly, only one of the arms may extend into an undercut.




Question 153

Which of the following steps is done LAST?

Rest preparation

Framework try-in

Centric relation records

Altered cast impression


Question 154

Incisal rests

are generally more positive vertical stops than cingulum rests.

may interfere with the opposing occlusion.

should not be used on maxillary incisors.

all of the above.


Question 155

True or False

Cast retentive arms are usually selected when the RPD is tooth supported or when the retentive tips release during functional movements of extension RPDs.




Question 156

Cleaning a removable partial denture in sodium hypochlorite may result in

increased caries activity

increased periodontal problems

corrosion of the metal of the framework

1 and 2 above


Question 157

Which of the following clasp assemblies utilizes a lingual undercut and can be used on premolars for either extension or tooth-supported RPDs?

half and half clasp

lingual I-bar

lingual modified T-bar

ring clasp


Question 158

If a metal base is to be used

an altered cast impression should be made after framework try-in

a stock tray should be used for the final impression

a custom tray should be used for the final impression

interocclusal records must be made after tooth selection


Question 159

True or False

When surveying to determine the height of contour of the abutments, the mark on the tooth must be made by the side of the lead marker.




Question 160


help stabilize the RPD by controlling occlusal movement.

help stabilize the RPD by controlling gingival movement.

may also function as indirect retainers.

prevent excessive biting forces on the abutments.


On to Questions 161 through 170