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Dental Materials & Laboratory Techniques Flashcards

7 cards from real CDT 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 & Laboratory Techniques flashcards as text

  1. Which type of articulator replicates all mandibular movements using patient-specific records?

    Answer: Class IV fully adjustable articulator

    A fully adjustable (Class IV) articulator accepts individualized pantographic tracings to reproduce all six degrees of mandibular freedom.

  2. What does the term 'noble metal content' refer to in ADA classification of dental casting alloys?

    Answer: The combined percentage of gold, platinum, palladium, and other platinum-group metals

    Noble metal content is the total percentage of gold plus platinum-group metals (platinum, palladium, rhodium, ruthenium, iridium, osmium) in the alloy.

  3. Epoxy die materials are superior to gypsum dies in which property?

    Answer: Better dimensional accuracy and abrasion resistance

    Epoxy resin dies exhibit very low setting shrinkage, excellent surface hardness, and high abrasion resistance, making them ideal for precision work.

  4. Suck-down (vacuum-formed) thermoplastic trays are most commonly fabricated at a temperature of approximately:

    Answer: 130–160°C

    Most thermoplastic tray materials soften adequately for vacuum forming in the 130–160°C range without degrading the material.

  5. In ceramics, the term 'leucite' is significant because it:

    Answer: Raises the coefficient of thermal expansion to match metal alloys

    Leucite crystals in feldspathic porcelain increase the coefficient of thermal expansion, matching it more closely to PFM alloys and reducing firing stress cracking.

  6. The water-powder ratio (W/P ratio) for a Type IV die stone is typically:

    Answer: 0.18–0.22 mL/g

    Type IV die stone requires a low W/P ratio of approximately 0.18–0.22 mL/g, producing a very hard, dimensionally accurate set stone.

  7. Which finishing bur geometry is preferred for contouring heat-pressed ceramic restorations without introducing micro-cracks?

    Answer: Diamond bur with continuous water irrigation at low speed

    Fine diamond burs used with continuous water cooling at low speed minimize frictional heat and prevent thermal micro-cracking in glass ceramics.