Silicone Materials & Color Matching 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 Silicone Materials & Color Matching flashcards as text
Which platinum catalyst concentration is typically used to achieve a Shore A hardness of 25-35 for facial prostheses?
Answer: 1-3% by weight
Platinum catalyst concentrations of 1-3% by weight are standard for achieving clinically appropriate Shore A hardness in facial prosthetics.
What is the primary disadvantage of using cadmium-based pigments in silicone prostheses?
Answer: They are toxic and pose biocompatibility concerns
Cadmium-based pigments are toxic and fail biocompatibility requirements, making them unsuitable for skin-contact prosthetic devices.
A prosthesis appears orange-toned in fluorescent office lighting but matches skin in natural daylight. What phenomenon explains this?
Answer: Metamerism
Metamerism occurs when two colors appear to match under one light source but differ under another due to different spectral reflectance curves.
Which silicone property is most critical for fabricating a thin-edged auricular prosthesis margin?
Answer: High tear strength
High tear strength prevents thin feathered margins from tearing during placement and removal of auricular prostheses.
When mixing intrinsic silicone colorants, which color is used to neutralize excessive redness in a prosthesis?
Answer: Blue-green
Blue-green is the complementary color to red on the color wheel and is used to neutralize excessive redness in silicone matching.
Room-temperature vulcanizing (RTV) silicone differs from high-temperature vulcanizing (HTV) silicone primarily in that RTV:
Answer: Cures at ambient temperature using a condensation or addition reaction
RTV silicones cure at room temperature via condensation or addition reactions, making them practical for clinical prosthetic fabrication without specialized equipment.
Which property of silicone is described by its ability to return to original shape after deformation without permanent set?
Answer: Resilience
Resilience describes the ability of silicone elastomers to recover their original shape after elastic deformation, which is essential for prosthetic fit and function.