Practice Test Geeks(AGD) Academy of General Dentistry Certification Practice Test
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Dental Materials and Application Flashcards

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

Read the first 7 Dental Materials and Application flashcards as text

  1. Which polymerization shrinkage characteristic of composite resins is most clinically significant?

    Answer: Shrinkage occurs toward the light source

    Composite resins shrink toward the curing light, which is why proper light placement and incremental layering techniques are used to minimize marginal gaps.

  2. What is the primary advantage of using resin-modified glass ionomer cement (RMGIC) over conventional glass ionomer?

    Answer: Improved physical properties while retaining fluoride release and adhesion

    RMGIC incorporates resin monomers to improve strength and working time while retaining the fluoride release and chemical adhesion to tooth structure of conventional GIC.

  3. Which amalgam alloy phase is associated with the greatest dimensional change and corrosion susceptibility?

    Answer: Gamma-2 phase (Sn7-8Hg)

    The gamma-2 phase (Sn7-8Hg) is the weakest, most corrosion-prone phase in amalgam, which is why high-copper alloys were developed to eliminate it.

  4. A patient presents with a cracked cusp on a maxillary molar. Which indirect restorative material best resists crack propagation?

    Answer: Lithium disilicate ceramic onlay

    Lithium disilicate (e.max) has high flexural strength (~400 MPa) and fracture toughness, making it ideal for resisting propagation of cracks in posterior teeth.

  5. What effect does the addition of palladium have in metal-ceramic alloys?

    Answer: Raises the melting range and improves oxidation resistance

    Palladium raises the melting temperature and improves corrosion/oxidation resistance in metal-ceramic alloys, making them suitable for high-firing porcelains.

  6. Which property of zinc phosphate cement makes it suitable as a base under metallic restorations?

    Answer: High thermal insulating capacity protects the pulp

    Zinc phosphate cement serves as a thermal insulator under metallic restorations, protecting the pulp from temperature changes conducted through metal.

  7. During impression making, which material requires the use of a custom tray to achieve optimal accuracy?

    Answer: Zinc oxide eugenol impression paste

    Zinc oxide eugenol paste requires a custom tray due to its minimal working and setting characteristics that demand close adaptation to the tissues.