Prosthodontic & Orthodontic Appliance Fabrication Flashcards
7 cards from real CDT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Prosthodontic & Orthodontic Appliance Fabrication flashcards as text
Which alloy system is most commonly used for fabricating removable partial denture frameworks due to its strength and biocompatibility?
Answer: Cobalt-chromium alloy
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.
When investing a wax pattern for a full-cast crown, which type of investment is most appropriate for high-gold alloys?
Answer: Gypsum-bonded investment
Gypsum-bonded investments are used with high-gold alloys because their expansion characteristics match gold's thermal behavior at lower casting temperatures.
In orthodontic appliance fabrication, what is the primary purpose of incorporating an expansion screw into an acrylic palatal expander?
Answer: To apply gradual transverse force to separate the mid-palatal suture
The expansion screw incrementally widens the appliance, transmitting lateral forces to the alveolar ridges and mid-palatal suture to create skeletal expansion.
A technician is fabricating a metal-ceramic crown. At what stage should the metal coping be evaluated for proper ceramic support and spacing?
Answer: After degassing and prior to opaquing
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.
Which type of clasp arm provides the greatest flexibility and is most appropriate for engaging deep undercuts on abutment teeth in an RPD?
Answer: Wrought-wire clasp arm
Wrought-wire clasp arms are more flexible than cast arms, allowing them to engage deeper undercuts without generating excessive stress on abutment teeth.
When fabricating a mandibular complete denture, why is a broad, flat posterior ridge crest generally considered more favorable than a knife-edged ridge?
Answer: It provides greater denture base surface area for load distribution and retention
A broad flat ridge provides a larger bearing area to distribute occlusal loads and allows greater mucosal contact, improving both stability and retention.
In constructing a Hawley retainer, the labial bow is most commonly fabricated from which wire gauge?
Answer: .018-inch stainless steel
The .018-inch stainless steel wire is the standard for Hawley labial bows, providing sufficient rigidity to maintain arch form while allowing minor adjustments.