CDT Dental Materials & Laboratory Techniques 5

Question 1

Galvanic corrosion in the mouth most likely occurs when:

Accepted Answer

Dissimilar alloys with different electrochemical potentials contact each other in saliva

Answer

When dissimilar metals touch in an electrolyte like saliva, current flows from the anodic metal to the cathodic metal, causing the anode to corrode.

Question 2

The angulation of the condylar guidance on a semi-adjustable articulator is set using a:

Accepted Answer

Protrusive bite registration

Answer

A protrusive bite registration captures the condylar path angle as the mandible moves forward, allowing the articulator's horizontal condylar inclination to be adjusted.

Question 3

Which statement best describes the difference between burnishing and polishing in metal finishing?

Accepted Answer

Burnishing plastically flows and compresses the surface without material removal; polishing removes micro-scratches by abrasion

Answer

Burnishing compresses and flows surface metal to fill micro-defects, while polishing uses progressively finer abrasives to remove surface material and reduce roughness.

Question 4

The agar hydrocolloid impression material must be maintained in a conditioning bath at approximately:

Accepted Answer

60–65°C (140–150°F)

Answer

Agar is stored in a conditioning bath at 60–65°C to keep it in the sol (fluid) state, ready for syringing or loading into a tray.

Question 5

When constructing a partial denture framework, which survey line determines the path of insertion?

Accepted Answer

The survey line established at the chosen path of insertion angle by the surveyor

Answer

The surveyor draws a line at the greatest convexity of each abutment tooth for the selected tilt, defining retentive and reciprocal clasp arm positions.

(CDT) Certified Dental Technicians Practice Test

(CDT) Certified Dental Technicians Practice Test

CDT Dental Materials & Laboratory Techniques 5