Dental Materials Flashcards
7 cards from real ADAP 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 flashcards as text
Which component of an adhesive bonding system chemically modifies the smear layer and opens dentinal tubules?
Answer: Etchant/conditioner
The etchant (typically phosphoric acid) removes or modifies the smear layer and opens dentinal tubules to prepare the surface for bonding.
Trituration of amalgam alloy refers to the process of:
Answer: Mechanically mixing alloy powder with mercury in an amalgamator
Trituration is the mechanical mixing of amalgam alloy powder with liquid mercury in an amalgamator (triturator) to produce a workable mix.
Which impression material exhibits the highest dimensional accuracy and is preferred for implant-level impressions?
Answer: Addition silicone (polyvinyl siloxane)
Addition silicone (PVS) has the highest dimensional stability, minimal shrinkage, and excellent elastic recovery, making it the gold standard for precision impressions.
Galvanic action in the oral cavity can occur when:
Answer: Dissimilar metals in different restorations touch in saliva
When two different metals contact each other in the electrolytic environment of saliva, a galvanic cell forms, causing corrosion and a sharp metallic pain.
The purpose of applying separating medium (tin foil substitute) to a stone model before constructing an acrylic appliance is to:
Answer: Prevent the acrylic from bonding chemically to the gypsum model
Separating medium creates a barrier between acrylic resin and gypsum so the finished appliance can be removed without damaging the model or restoration.
A dental adhesive primer's primary function is to:
Answer: Infiltrate demineralized dentin and condition it for bonding resin adhesion
Primer contains hydrophilic monomers that penetrate wet, demineralized dentin collagen and condition it to accept the hydrophobic bonding resin.
Which property describes composite resin's tendency to shrink toward the light source during curing?
Answer: Polymerization shrinkage vector
Composite shrinks toward the curing light during polymerization; directing the light from the tooth surface can vector shrinkage toward the cavity walls to improve adaptation.