Laboratory Techniques & Technology Flashcards
7 cards from real CDC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Laboratory Techniques & Technology flashcards as text
Which of the following best describes the role of alumina sandblasting prior to porcelain application on a metal-ceramic framework?
Answer: Creates micro-mechanical retention and removes surface contaminants
Alumina sandblasting roughens the metal surface for mechanical interlocking and removes oils or oxides that would inhibit ceramic adhesion.
When fabricating an implant-supported ceramic crown, the internal conical connection angle of the abutment primarily affects:
Answer: Screw-joint stability and resistance to micro-movement
The taper angle of conical connections (e.g., Morse taper) creates a cold-weld frictional lock that resists micro-movement and reduces screw loosening.
A dental ceramist is asked to increase the value (brightness) of a restoration without changing its hue. Which action achieves this?
Answer: Selecting a higher-value (lighter) body ceramic and reducing stain pigment
Value is controlled by the lightness of the ceramic; using a higher-value body porcelain with minimal dark stain increases brightness independent of hue.
In the context of removable partial denture frameworks, what is the purpose of stress-relief loops in clasps?
Answer: Distribute flexural fatigue and prevent clasp fracture
Stress-relief loops (U-loops or coils) lengthen the effective clasp arm, distributing flexural stress over a greater area and reducing fracture risk.
What is the MAIN advantage of using a full-contour wax-up before designing a ceramic restoration digitally?
Answer: It provides a functional and esthetic blueprint that can be scanned as a reference
A wax-up establishes ideal occlusion and esthetics that can be scanned into CAD software as a digital design reference, guiding the final restoration contour.
Which type of dental furnace cycle is specifically designed to fire zirconia to full density?
Answer: High-temperature sintering cycle at 1450–1600°C
Zirconia requires sintering at 1450–1600°C to achieve full densification and translucency; standard porcelain furnaces cannot reach this temperature.
When trimming a die with a die trimmer, the ceramist must ensure the finish line is:
Answer: Clearly exposed and distinct from the surrounding stone
The finish line must be fully exposed and distinct so the ceramist can accurately reproduce the margin of the restoration without over- or under-extension.