RPD Review Questions

Questions 1-10


Question #1

In reference to the partially edentulous arch and accompanying framework shown---what is the Kennedy classification?

Class I, Modification 0

Class II, Modification 1

Class III, Modification 0

Class IV, Modification 0

 

Does this RPD have an axis of rotation? If so, where is it located? What class(s) of RPDs do not have an axis of rotation?


Question #2

 

The accompanying figure depicts the lingual surface on the lower anterior teeth of a patient who is currently wearing a bilateral distal extension removable partial denture that was fabricated 5 years ago. What do you think is the most likely cause for the tissue damage that has occurred on tooth #22?

The lower anterior teeth should have been plated and were not.

The patient's oral hygiene is poor and tissue breakdown followed pocket formation on the distal of tooth #22.

A rest preparation and rest should have been placed on tooth #22.

A cast circumferential clasp was used on tooth #22----it should have been wrought wire.


Question #3

Your patient has teeth 20-29 remaining. You plan to use mesial rests and I-bars on both terminal abutments. Because there are lingual tori present, you will need to use linguoplating in the premolar areas. The illustration is a lingual view of teeth 27-29. The dotted line on #29 represents the height of contour (survey line). What should be the relationship of the superior border of the plating and the survey line?

The plating should extend above the survey line.

The plating should end at or below the survey line.

The plating must end exactly at the survey line.

The plating must end below the survey line.


Question #4

In the maxillary class III RPD shown either a palatal strap or an anterior-posterior palatal strap major connector may be used. If an anterior-posterior strap design is to be considered, the opening between the anterior and posterior palatal straps should be at least _______ mm.

5

10

15

20


Question #5

True or False

Because there are no movable tissues on the palate, the borders of maxillary major connectors may be located farther from the gingival margins than those of mandibular major connectors.

True

False


Question #6

 

On the mandibular class III framework shown, circumferential clasps have been used on the canine, premolar, and molars. Which one of the following statements regarding the clasping is TRUE?

 

The retentive arms on the canine and premolar should be wrought wire while those on the molars should be cast.

The lingual arms on the molars are frequently the retentive arms because there are often no usable facial undercuts.

If the undercut on the second premolar is on the distofacial, the circumferential retentive arm would most likely be changed to I-bars.

In order to ensure adequate retention, the tips of both the buccal and lingual arms on the molars should be placed in undercuts.


Question #7

True or False

On the RPD framework shown, the rests on teeth numbers 20 and 28 are indirect retainers and function when the patient bites down on the distal extension area.

True

False

 


Question #8

True or False

Guide surface preparations should be completed before rest seat preparations.

True

False


Question #9

True or False

In the class II mandibular RPD shown to the right, the clasp on tooth #27 should be wrought wire BECAUSE the cingulum rest acts like a distal rest and the tip of the retentive arm is in front of the axis of rotation.

True

False


Question #10

True or False

When tripoding a cast, the vertical arm of the surveyor must be locked in position.

True

False

 


On to Questions 11-20