CDT Removable Prosthodontics 3

Question 1

Which major connector design for a maxillary RPD covers the least palatal tissue and is indicated when all remaining teeth are anterior?

Accepted Answer

U-shaped (horseshoe) connector

Answer

The U-shaped (horseshoe) connector is used when all remaining teeth are anterior, though it is the least rigid and should be avoided when possible.

Question 2

In RPD design, a reciprocal clasp arm is placed to:

Accepted Answer

Balance the force exerted by the retentive clasp arm

Answer

The reciprocal arm opposes the force of the retentive clasp as it flexes over the height of contour, preventing lateral movement of the abutment tooth.

Question 3

Denture teeth made of porcelain are preferred over acrylic teeth primarily because they:

Accepted Answer

Offer superior wear resistance and hardness

Answer

Porcelain teeth resist wear better than acrylic teeth, maintaining occlusal vertical dimension over time despite their brittleness and lack of chemical bonding.

Question 4

The labial flange thickness and extension of a maxillary complete denture is critical because it directly affects:

Accepted Answer

Facial support and lip fullness

Answer

The labial flange provides critical support for the upper lip and perioral tissues, restoring lost facial contour after tooth and ridge loss.

Question 5

A RPI clasp system (Rest, Proximal plate, I-bar) is advantageous for distal extension RPDs because the I-bar:

Accepted Answer

Disengages from the undercut during functional loading

Answer

The I-bar is designed to disengage from the undercut when the distal extension base moves inferiorly under load, reducing torquing forces on the abutment.

(CDT) Certified Dental Technicians Practice Test

(CDT) Certified Dental Technicians Practice Test

CDT Removable Prosthodontics 3