CDT Ceramics & Porcelain Techniques Flashcards
6 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 6 CDT Ceramics & Porcelain Techniques flashcards as text
What is the primary purpose of applying an opaque layer in a porcelain-fused-to-metal (PFM) restoration?
Answer: To mask the metal substrate and establish base shade
The opaque layer masks the dark metal coping and creates the foundation shade for the overlying porcelain layers.
Which firing stage in porcelain condensation produces the greatest shrinkage?
Answer: Body/dentin firing
Body/dentin firing involves the largest volume of porcelain and therefore produces the most significant shrinkage during sintering.
What does a 'wash bake' accomplish in ceramic fabrication?
Answer: Applies a thin porcelain wash to correct minor shade discrepancies
A wash bake adds a very thin layer of porcelain to blend or correct localized shade or surface irregularities before glazing.
What causes a 'chipping' or delamination failure in a PFM restoration?
Answer: Using high-fusing porcelain on a low-fusing alloy
Using high-fusing porcelain on a low-fusing alloy creates thermal expansion mismatches that result in cohesive or adhesive failures.
Which technique is used to characterize the internal structure of a ceramic crown for a more lifelike appearance?
Answer: Layering technique with dentin, enamel, and effect powders
The layering technique uses multiple porcelain powders (dentin, enamel, incisal, effects) to replicate natural tooth structure.
What is the coefficient of thermal expansion (CTE), and why is it critical in PFM restorations?
Answer: A measure of how a material expands/contracts with temperature; metal and ceramic CTEs must be compatible
CTE compatibility between metal and porcelain prevents internal stresses that would cause cracking or delamination during cooling.