Practice Test Geeks(EFDA) Expanded Function Dental Auxiliary Practice Test
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Impression Materials and Techniques Flashcards

7 cards from real EFDA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Impression Materials and Techniques flashcards as text

  1. Which impression material is most appropriate for capturing a final impression for a complete denture?

    Answer: Zinc oxide eugenol (ZOE) paste

    Zinc oxide eugenol paste is a mucostatic material commonly used for final complete denture impressions because it records tissues in a resting state.

  2. What is the primary reason polyether impression materials require careful storage conditions?

    Answer: They absorb water and dimensional changes occur in humid environments

    Polyether materials are hydrophilic and can absorb moisture from the air or storage environment, causing dimensional inaccuracies.

  3. When mixing addition silicone (PVS) impression material, what should the clinician avoid?

    Answer: Using latex gloves during mixing

    Sulfur compounds in latex gloves can inhibit the polymerization of addition silicone, resulting in a tacky, unset surface.

  4. A 'monophase' impression technique using PVS means:

    Answer: The same viscosity material is used in both the syringe and tray simultaneously

    In the monophase technique, a medium-viscosity PVS is loaded in both the syringe and the tray and placed simultaneously.

  5. Which property of addition silicone makes it preferred for implant-level impressions?

    Answer: Excellent dimensional stability allowing delayed pours

    PVS impressions can be stored for days to weeks without significant dimensional change, making them ideal when models must be poured remotely or later.

  6. What does the term 'snap set' refer to in alginate impressions?

    Answer: A rapid transition from a fluid to a gel state in a short time window

    Alginate undergoes snap set — a relatively abrupt gel transition rather than a gradual stiffening, which helps the clinician identify when setting is complete.

  7. Which of the following tray types is required when using polyvinyl siloxane for a full-arch impression?

    Answer: Rimlock tray with adhesive

    PVS requires mechanical or chemical retention to the tray; rimlock trays and/or tray adhesive prevent the set material from separating when the impression is removed.