Techniques & Materials Flashcards
7 cards from real CCA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Techniques & Materials flashcards as text
Which polymerization method produces the least dimensional shrinkage when fabricating a hard acrylic prosthetic base?
Answer: Heat-cured acrylic under pressure
Heat-curing under pressure (e.g., in a hydraulic press) minimizes porosity and shrinkage compared to cold-cure systems, yielding more dimensionally stable prosthetics.
When color-matching a facial prosthesis under natural daylight conditions, which phenomenon must the anaplastologist account for?
Answer: Metameric mismatch (metamerism)
Metamerism means two colors that appear identical under one light source (e.g., fluorescent) may look different under daylight, requiring matching under multiple illuminants.
In the lost-wax casting process for anaplastology, what happens to the wax pattern after the mold investment material sets?
Answer: It is eliminated by heating (burnout), leaving a void for the prosthetic material
The lost-wax technique involves burning out (eliminating) the wax pattern in a furnace, leaving a precise negative space into which the final material is injected or packed.
Which property of medical-grade platinum-cure silicone makes it preferable over tin-cure silicone for ear and nose prostheses?
Answer: Minimal shrinkage and improved long-term stability
Platinum-cure (addition-cure) silicone exhibits virtually no by-product off-gassing and very low shrinkage, producing more dimensionally accurate and durable prostheses.
When using bar-retained osseointegrated implants for a nasal prosthesis, the bar framework is fabricated from which material?
Answer: Titanium or gold alloy
Titanium or gold-alloy bars are milled or cast to connect implant abutments, providing a rigid, biocompatible superstructure for the nasal prosthesis retention system.
Which technique allows the anaplastologist to characterize blood vessel details (telangiectasia) on a silicone prosthesis surface?
Answer: Painting fine red/blue threads with diluted silicone pigments
Fine synthetic fibers or capillary-fine brush strokes of tinted silicone are applied to the prosthesis surface or embedded near the margin to simulate superficial vasculature.
What is the function of a scleral impression for an ocular prosthesis patient?
Answer: To record the exact contour of the anophthalmic socket for a custom-fitted shell
A scleral impression captures the unique three-dimensional contour of the orbit and socket tissues, enabling fabrication of a custom prosthetic eye that fits precisely and moves naturally.