CCA Techniques & Materials 3

Question 1

Which polymerization method produces the least dimensional shrinkage when fabricating a hard acrylic prosthetic base?

Accepted Answer

Heat-cured acrylic under pressure

Answer

Heat-curing under pressure (e.g., in a hydraulic press) minimizes porosity and shrinkage compared to cold-cure systems, yielding more dimensionally stable prosthetics.

Question 2

When color-matching a facial prosthesis under natural daylight conditions, which phenomenon must the anaplastologist account for?

Accepted Answer

Metameric mismatch (metamerism)

Answer

Metamerism means two colors that appear identical under one light source (e.g., fluorescent) may look different under daylight, requiring matching under multiple illuminants.

Question 3

In the lost-wax casting process for anaplastology, what happens to the wax pattern after the mold investment material sets?

Accepted Answer

It is eliminated by heating (burnout), leaving a void for the prosthetic material

Answer

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.

Question 4

Which property of medical-grade platinum-cure silicone makes it preferable over tin-cure silicone for ear and nose prostheses?

Accepted Answer

Minimal shrinkage and improved long-term stability

Answer

Platinum-cure (addition-cure) silicone exhibits virtually no by-product off-gassing and very low shrinkage, producing more dimensionally accurate and durable prostheses.

Question 5

When using bar-retained osseointegrated implants for a nasal prosthesis, the bar framework is fabricated from which material?

Accepted Answer

Titanium or gold alloy

Answer

Titanium or gold-alloy bars are milled or cast to connect implant abutments, providing a rigid, biocompatible superstructure for the nasal prosthesis retention system.

(CCA) Certified Clinical Anaplastologist Practice Test

(CCA) Certified Clinical Anaplastologist Practice Test

CCA Techniques & Materials 3