Prosthetics Design & Fabrication Flashcards
7 cards from real CDC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Prosthetics Design & Fabrication flashcards as text
Which type of pontic design provides the BEST esthetics for anterior fixed partial dentures while still allowing adequate cleaning?
Answer: Ovate pontic
The ovate pontic fits into a prepared tissue depression, creating natural-looking emergence and allowing cleaning with floss.
Internal porosity in a cast metal framework is MOST commonly caused by:
Answer: Shrinkage porosity from rapid metal solidification without sufficient reservoir
Shrinkage porosity occurs when the metal solidifies too quickly without an adequate sprue/reservoir to feed molten metal into the shrinking casting.
A ceramist is layering feldspathic porcelain onto a lithium disilicate coping. Which step is critical before applying body porcelain?
Answer: Sandblasting, cleaning, and applying appropriate ceramic adhesion liner per manufacturer instructions
Lithium disilicate copings require surface preparation and often a liner/wash firing to promote porcelain adhesion and achieve desired final shade.
When evaluating occlusal contacts on a finished prosthesis, a 'shimstock' (8 µm foil) is used to:
Answer: Detect the presence and holding force of occlusal contacts
Shimstock held between opposing teeth and tugged indicates whether a contact is present and whether it is light or heavy based on resistance to removal.
The dental term 'emergence profile' in prosthetic design refers to:
Answer: The contour of a restoration from the gingival sulcus to the height of contour
Emergence profile describes the three-dimensional contour of a restoration as it exits the gingival sulcus, influencing tissue health and esthetics.
Which alloy classification is MOST appropriate for use with PFM restorations due to its high fusion temperature and biocompatibility?
Answer: Base metal alloy (nickel-chromium or cobalt-chromium)
Base metal alloys (Ni-Cr or Co-Cr) have high melting ranges compatible with PFM porcelain firing temperatures and provide adequate stiffness for thin metal copings.
A laboratory remount procedure after glazing a full-arch ceramic restoration is performed primarily to:
Answer: Refine and equilibrate occlusal contacts that may have shifted after ceramic firing
Firing cycles can cause minor ceramic deformation, so a laboratory remount allows the ceramist to verify and adjust occlusion on the articulator before delivery.