CCA Silicone Materials & Color Matching 2

Question 1

Which platinum catalyst concentration is typically used to achieve a Shore A hardness of 25-35 for facial prostheses?

Accepted Answer

1-3% by weight

Answer

Platinum catalyst concentrations of 1-3% by weight are standard for achieving clinically appropriate Shore A hardness in facial prosthetics.

Question 2

What is the primary disadvantage of using cadmium-based pigments in silicone prostheses?

Accepted Answer

They are toxic and pose biocompatibility concerns

Answer

Cadmium-based pigments are toxic and fail biocompatibility requirements, making them unsuitable for skin-contact prosthetic devices.

Question 3

A prosthesis appears orange-toned in fluorescent office lighting but matches skin in natural daylight. What phenomenon explains this?

Accepted Answer

Metamerism

Answer

Metamerism occurs when two colors appear to match under one light source but differ under another due to different spectral reflectance curves.

Question 4

Which silicone property is most critical for fabricating a thin-edged auricular prosthesis margin?

Accepted Answer

High tear strength

Answer

High tear strength prevents thin feathered margins from tearing during placement and removal of auricular prostheses.

Question 5

When mixing intrinsic silicone colorants, which color is used to neutralize excessive redness in a prosthesis?

Accepted Answer

Blue-green

Answer

Blue-green is the complementary color to red on the color wheel and is used to neutralize excessive redness in silicone matching.

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