RPD Review Questions

Questions 161-170


Question #161

Your patient exhibits the partially edentulous arch shown to the right. Tooth #29 is tilted mesially. The undercut is on the mesiofacial surface. What would be the best clasp assembly for this situation?

Distal rest and cast circumferential clasp.

Distal rest and WW circumferential clasp.

Mesial rest and I-bar.

Distal rest and I-bar.

 


Question 162

During biting, a maxillary Class I RPD will rotate around a line determined by the rigid metal above the survey line and closest to the extension areas. This line is called

Camper's line

Frankfurt line

Dual path line

Axis of rotation

 


Question 163

The WORST clasp assembly for a terminal abutment on a mandibular class I RPD (such as #29 in the partially edentulous arch to the right) is

Mesial rest and I-bar

Distal rest and cast circumferential clasp

Mesial and distal rest and a 1/2 and 1/2 clasp

Mesial rest and modified T-bar

 


Question 164

The guide surface preparation should be curved

mesio-distally

bucco-lingually

occluso-gingivally

none of the above

 


Question 165

Fill in the blank

What are the indications for a linguoplate as a major connector for a mandibular RPD?

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Question 166

Fill in the blank.

Name four types of suprabulge clasps.

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Question 167

Fill in the blank.

Your patient has teeth numbers 20 through 29 remaining. The illustration to the right shows the design for a modified T-bar retainer on tooth #29. The vertical line on the tooth represents the greatest mesiodistal curvature of the facial surface. Do you see any problems with the design?

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Question 168

Fill in the blank

In the illustration shown to the right, what would be your first choice for a retainer (clasp) on tooth #6?

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Question 169

 

Fill in the blank

Your patient has the partially edentulous arch shown to the right. The molars have drifted mesially and lingually so that the only usable undercuts are on the mesiolingual. What clasps would you use on the molars if (1) there were no large tissue undercuts and (2) there were large tissue undercuts?

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Question 170

Fill in the blank

Which classes of mandibular RPDs require an altered cast impression?

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On to Questions 171 through 180