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 wax technique involves building up contours incrementally using small additions of molten wax to establish axial walls of a dental prosthesis?
Answer: Additive wax-up technique
The additive wax-up technique builds form by progressively adding molten wax rather than removing bulk material.
When designing a three-unit fixed partial denture, the connector dimensions should typically be at least:
Answer: 4 mm × 4 mm cross-section
A minimum 4 mm × 4 mm connector cross-section provides adequate strength to resist fracture under occlusal forces in a three-unit FPD.
A dental ceramist notices that a PFM crown has metal showing through the incisal ceramic after firing. The MOST likely cause is:
Answer: Insufficient porcelain build-up thickness over the metal
Inadequate porcelain thickness allows the underlying metal substrate to remain visible through translucent incisal porcelain.
Which occlusal scheme is MOST often recommended for a full-arch implant-supported fixed prosthesis to protect implants from lateral forces?
Answer: Canine-guided occlusion with posterior disclusion
Canine-guided occlusion with posterior disclusion distributes lateral forces to the canines and protects posterior implants from damaging off-axis loading.
During the lost-wax casting process, the elimination of the wax pattern from the investment mold is accomplished by:
Answer: Burnout in a furnace at high temperature
High-temperature burnout in a furnace vaporizes the wax pattern and preheats the mold for molten metal casting.
The primary purpose of a palatal index or silicone stent during porcelain layering is to:
Answer: Maintain correct lingual contour and thickness reference
A silicone stent fabricated from the diagnostic wax-up provides a reference to ensure consistent lingual contour and porcelain thickness during build-up.
When fabricating a zirconia-based restoration, the most critical factor affecting final fit accuracy after sintering is:
Answer: Correct application of the manufacturer's sintering shrinkage compensation factor
Zirconia undergoes approximately 20–25% linear shrinkage during sintering, so the CAD/CAM system must enlarge the pre-sintered framework using the manufacturer's compensation factor for accurate final fit.