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Amalgam and Composite Restorations 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 Amalgam and Composite Restorations flashcards as text

  1. A 'high' amalgam restoration on occlusal check reveals a shiny spot on the restoration. This indicates:

    Answer: A premature occlusal contact that needs adjustment

    A shiny spot (burnish mark) from articulating paper indicates a high spot that must be adjusted to prevent fracture or patient discomfort.

  2. Which composite resin type provides the BEST wear resistance for posterior occlusal restorations?

    Answer: Hybrid or nanohybrid composite

    Hybrid and nanohybrid composites contain both large and small filler particles, providing superior strength and wear resistance for posterior teeth.

  3. The purpose of placing a liner such as calcium hydroxide in a deep cavity preparation before amalgam is to:

    Answer: Stimulate secondary dentin formation and protect the pulp

    Calcium hydroxide stimulates reparative (tertiary) dentin formation and protects the pulp in areas of near-exposure.

  4. When using the acid-etch technique for composite bonding, phosphoric acid is applied to enamel for approximately:

    Answer: 15–30 seconds

    Phosphoric acid (35–37%) is applied to enamel for 15–30 seconds to create adequate microporosities for resin tag formation.

  5. An EFDA notices the composite restoration has voids after initial cure. The BEST course of action is to:

    Answer: Inform the dentist immediately for evaluation and repair

    Voids compromise restoration integrity and invite microleakage; the dentist must evaluate whether repair or replacement is needed.

  6. The purpose of using a Tofflemire matrix system during Class II amalgam placement is to:

    Answer: Re-establish the missing proximal wall for condensation

    The Tofflemire matrix band temporarily replaces the missing proximal wall so amalgam can be condensed without overhang.

  7. Spherical amalgam alloy requires LESS condensation pressure compared to admixed alloy because:

    Answer: The spherical particles pack together with less interparticle resistance

    Spherical particles roll over each other more easily, reducing the condensation force needed while still achieving adequate adaptation.