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 wax is most commonly used for sculpting anaplastology patterns due to its ideal carving consistency at room temperature?
Answer: Baseplate (modeling) wax or pink casting wax
Baseplate and pink casting waxes offer firm yet carvable consistency at room temperature and adequate softness with gentle warming, making them the standard sculpting medium.
The transpositioning technique in silicone prosthetic fabrication refers to:
Answer: Transferring intrinsic color layers in a specific sequence to achieve anatomical depth of color
Transpositioning (or layering/stratification) involves applying pigmented silicone in anatomically ordered layers—deeper dermal tones first, then superficial—to replicate skin's optical depth.
A clinical anaplastologist uses contralateral anatomy for pattern development primarily when:
Answer: The defect is unilateral and the opposite normal structure can be mirrored as a template
For unilateral defects (e.g., one ear absent), an impression of the intact contralateral structure is mirrored to create an anatomically accurate pattern for the prosthesis.
Which material property is most critical when selecting a silicone for a nasal prosthesis at the alar base margin?
Answer: Low durometer (Shore A 15-25) for natural softness and marginal flexibility
A low Shore A hardness (15-25) ensures the thin nasal margin mimics natural soft-tissue flexibility, preventing visible rigidity and improving cosmetic integration.
When incorporating hair into a silicone eyebrow prosthesis, what technique is used to implant individual hairs?
Answer: Individual hairs are punched or implanted one at a time using a hypodermic needle or specialized tool
Individual hair punching (implantation) with a fine needle or hair-work tool replicates the natural follicular pattern, allowing proper growth-direction and density.
Spectacle-borne (glasses-retained) orbital prostheses are most appropriate for which patient situation?
Answer: Patients who are not implant candidates and have residual orbital rim for frame support
When osseointegrated implants are contraindicated (e.g., due to prior radiation or patient preference), spectacle frames can support a lightweight orbital prosthesis using the bony orbital rim.
The extrinsic coloring of a silicone prosthesis is MOST vulnerable to which degradation factor?
Answer: Mechanical abrasion and cleaning friction over time
Extrinsic surface pigments are not protected within the silicone matrix, making them susceptible to removal by abrasive cleansers, rubbing, and adhesive removal friction.