RPD Review Questions

Questions 81-90


Question #81

All of the components listed below may be involved in the 180 degree encirclement rule EXCEPT

I-bar

Minor connector

Guide plate

Open latticework

 


Question #82

What is the correct relationship of the foot of an I-bar to the survey line (height of contour) on a terminal abutment for an extension RPD?

The foot should be entirely above the survey line.

The foot should be partially above and partially below the survey line.

The foot should be totally below the survey line.

The relationship of the foot of the I-bar and the survey line is of no consequence.

 


Question #83

True or False

The primary indication for and Oddo clasp occurs when an anterior abutment has excessive labial inclination so that the retainer (clasp) would be very close to the incisal edge.

True

False

 


Question #84

True or False

The purpose of the altered cast impression procedure is to obtain the maximum support possible from the edentulous areas of class I and class II RPDs.

True

False

 


Question #85

True or False

When there are extensive edentulous areas present in both arches and no opposing teeth meet, we should establish the vertical dimension of occlusion prior to making a centric relation record.

True

False

 


Question #86

True or False

You are fabricating maxillary and mandibular RPDs for your patient. At the framework try-in appointment, both frameworks should initially be placed in the mouth to check for occlusal interferences.

True

False

 


Question #87

True or False

A protrusive record is made with the mandibular anterior teeth approximately 6 mm forward of centric relation (or with the mandibular and maxillary anterior teeth in an edge to edge relationship). This record is used to set the horizontal condylar guidance on the articulator.

True

False

 


Question #88

True or False

The space that opens between the posterior teeth during anterior movement of the mandible is called Christensen's Phenomenon. This posterior separation is increased if the incisal guidance is increased.

True

False

 


Question #89

True or False

Before trying in a framework, you should inspect the master cast for damage and inspect the framework for sharp fins.

True

False

 


Question #90

True or False

Your RPD framework fits the cast but does not fit in the mouth. One should assume that the impression for the cast was inaccurate and that a new impression will need to be made.

True

False

 


On to Questions 91 through 100