Prosthetic Fabrication & Assembly Techniques Flashcards
7 cards from real CPT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Prosthetic Fabrication & Assembly Techniques flashcards as text
Which catalyst-to-resin ratio deviation is most likely to cause a brittle, under-cured lamination?
Answer: Too little catalyst relative to resin
Insufficient catalyst prevents full cross-linking of the resin, resulting in an under-cured, brittle laminate with reduced mechanical properties.
A carbon fiber foot keel should be inspected for delamination by:
Answer: Tap testing along the keel length and listening for dull sounds
Tap testing reveals delamination because separated layers produce a dull, hollow sound compared to the sharp tap of well-bonded composite.
When fabricating a prosthetic hand with intrinsic cables, cable housing must be secured to prevent:
Answer: Cable bowstringing away from the digit axes
Cable housing must be anchored along the digit pathway to prevent bowstringing, which would alter mechanical advantage and reduce grip efficiency.
To prevent galvanic corrosion between a titanium pylon and a stainless steel adapter, the technician should:
Answer: Use a nylon isolation washer between components
A nylon or other non-conductive isolation washer breaks the electrical pathway between dissimilar metals, preventing galvanic corrosion at the interface.
During dynamic alignment of an endoskeletal transfemoral prosthesis, the prosthetist observes a lateral trunk lean toward the prosthetic side in early stance. The technician is asked to shift the foot. The correct adjustment is to move the foot:
Answer: Medially under the socket
Moving the foot medially narrows the base of support and shifts the ground reaction force line medially, reducing the need for lateral trunk lean.
What is the primary reason for applying a silicone release agent to a positive plaster model before thermoplastic draping?
Answer: To prevent the thermoplastic from bonding to the plaster model
Release agent prevents the heated thermoplastic from adhering to the plaster positive model, allowing clean removal after the material cools.
When fabricating a Syme's prosthesis, the expandable inner wall or removable medial window is incorporated to:
Answer: Allow the bulbous distal stump to enter the socket
The Syme's residual limb has a bulbous distal end that cannot fit through the socket opening without an expandable section or removable window for donning.