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NBDHE Dental Materials and Procedures Flashcards

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

Read the first 7 NBDHE Dental Materials and Procedures flashcards as text

  1. Which type of gypsum product has the highest compressive strength and is used for dies?

    Answer: Die stone (Type IV)

    Type IV die stone has the highest compressive strength and lowest setting expansion, making it ideal for accurate die fabrication.

  2. What is the primary advantage of using polyvinyl siloxane (PVS) impression material over polysulfide?

    Answer: Greater dimensional stability over time

    PVS impression materials are addition silicones that exhibit excellent dimensional stability and can be poured multiple times without significant distortion.

  3. When cementing a metal crown with zinc phosphate cement, why must the tooth be kept dry?

    Answer: Moisture increases solubility in oral fluids

    Moisture contamination increases the solubility of zinc phosphate cement in oral fluids, reducing the longevity of the restoration.

  4. Which dental alloy classification contains at least 25% gold and is used for crowns requiring high strength?

    Answer: Type IV

    Type IV gold alloy has the highest hardness and strength due to its composition, making it suitable for thin restorations like inlays, partial denture frameworks, and clasps.

  5. What causes the 'orange peel' surface texture sometimes seen on processed acrylic denture bases?

    Answer: Insufficient pressure during processing

    Insufficient pressure during processing allows porosity to develop at the surface, creating the characteristic orange peel appearance.

  6. Which property of dental wax makes it suitable for use in bite registration procedures?

    Answer: Minimal flow at body temperature and brittleness at room temperature

    Bite registration waxes are formulated to have minimal flow at body temperature so they accurately record the occlusal relationship without distortion.

  7. A patient's composite restoration shows staining at the margins after 2 years. What material property is most responsible?

    Answer: Microleakage due to polymerization shrinkage

    Polymerization shrinkage creates gaps at the tooth-restoration interface, allowing microleakage that leads to marginal staining and secondary caries.

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