CCA Prosthetic Fabrication & Fitting 3

Question 1

Which platinum catalyst system is most commonly used to vulcanize addition-cured (condensation-free) silicone for facial prostheses?

Accepted Answer

Platinum-based addition catalyst at body or room temperature

Answer

Platinum-catalyzed addition-cure silicones produce no by-products, offer excellent biocompatibility, and cure at room or mild elevated temperatures used in anaplastology.

Question 2

In a magnetic retention system for an auricular prosthesis, the magnets are usually embedded in the:

Accepted Answer

Prosthesis base and the corresponding bar or cap on the abutment

Answer

One magnet set is encapsulated within the silicone prosthesis base and the opposing magnets are housed in keeper attachments on the implant bar or individual abutments.

Question 3

During impression-taking for a mid-facial defect, a dentist's tray adhesive is applied to the impression tray to:

Accepted Answer

Chemically bond the impression material to the tray, preventing distortion on removal

Answer

Tray adhesive creates a chemical bond between the elastomeric impression material and the tray, preventing the material from separating or distorting when removed from the defect.

Question 4

Extrinsic coloring of a cured silicone prosthesis is applied using silicone-compatible paints primarily because:

Accepted Answer

Silicone-based surface paints flex with the prosthesis and resist peeling better than non-compatible paints

Answer

Silicone-compatible extrinsic paints have the same elastic modulus as the prosthesis, so they flex without cracking and adhere longer than incompatible media.

Question 5

A stock ocular prosthesis differs from a custom-fabricated ocular prosthesis in that the stock version:

Accepted Answer

Has a pre-formed, standardized shape not individually contoured to the patient's socket

Answer

Stock prostheses come in pre-made sizes and iris colors and are not custom-fitted to the individual socket anatomy, often requiring more frequent adjustment and less optimal comfort.

(CCA) Certified Clinical Anaplastologist Practice Test

(CCA) Certified Clinical Anaplastologist Practice Test

CCA Prosthetic Fabrication & Fitting 3