CDT Prosthodontic & Orthodontic Appliance Fabrication 2

Question 1

Which alloy system is most commonly used for fabricating removable partial denture frameworks due to its strength and biocompatibility?

Accepted Answer

Cobalt-chromium alloy

Answer

Cobalt-chromium alloys are the industry standard for RPD frameworks because they offer high strength, rigidity, and excellent biocompatibility at lower cost than gold alloys.

Question 2

When investing a wax pattern for a full-cast crown, which type of investment is most appropriate for high-gold alloys?

Accepted Answer

Gypsum-bonded investment

Answer

Gypsum-bonded investments are used with high-gold alloys because their expansion characteristics match gold's thermal behavior at lower casting temperatures.

Question 3

In orthodontic appliance fabrication, what is the primary purpose of incorporating an expansion screw into an acrylic palatal expander?

Accepted Answer

To apply gradual transverse force to separate the mid-palatal suture

Answer

The expansion screw incrementally widens the appliance, transmitting lateral forces to the alveolar ridges and mid-palatal suture to create skeletal expansion.

Question 4

A technician is fabricating a metal-ceramic crown. At what stage should the metal coping be evaluated for proper ceramic support and spacing?

Accepted Answer

After degassing and prior to opaquing

Answer

The metal coping is evaluated for contour, fit, and ceramic support space after degassing but before opaquing to allow any metal adjustments without contaminating the porcelain layers.

Question 5

Which type of clasp arm provides the greatest flexibility and is most appropriate for engaging deep undercuts on abutment teeth in an RPD?

Accepted Answer

Wrought-wire clasp arm

Answer

Wrought-wire clasp arms are more flexible than cast arms, allowing them to engage deeper undercuts without generating excessive stress on abutment teeth.

(CDT) Certified Dental Technicians Practice Test

(CDT) Certified Dental Technicians Practice Test

CDT Prosthodontic & Orthodontic Appliance Fabrication 2