Restorative Dentistry Flashcards
7 cards from real NBDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Restorative Dentistry flashcards as text
Which dental material exhibits the highest coefficient of thermal expansion, most closely matching that of dentin?
Answer: Composite resin
Composite resin has a coefficient of thermal expansion closest to tooth structure among common restorative materials, though it is still higher than enamel and dentin.
A Class II amalgam restoration is being placed. What is the primary purpose of the proximal box form?
Answer: To provide access and extension for the proximal surface
The proximal box of a Class II preparation provides access and extension to include the carious proximal surface and clear the contact area.
When placing a composite resin restoration, incremental layering is recommended primarily to:
Answer: Reduce polymerization shrinkage stress
Incremental placement reduces the C-factor and allows each layer to partially relieve polymerization shrinkage stress before the next layer is added.
Which type of dental cement has the highest compressive strength and is most commonly used for permanent cementation of cast metal restorations?
Answer: Zinc phosphate
Zinc phosphate cement has the highest compressive strength among traditional luting cements and has been used as the gold standard for permanent cast restoration cementation.
A patient presents with a large carious lesion approaching the pulp. After caries removal, a thin layer of dentin remains. The BEST liner material to place is:
Answer: Calcium hydroxide
Calcium hydroxide is used as a direct or indirect pulp capping agent because it induces reparative dentin formation and has a high pH that is bactericidal.
In amalgam cavity preparation, resistance form refers to:
Answer: The shape that prevents restoration displacement under functional loads
Resistance form is the preparation feature that prevents fracture of the tooth or restoration under occlusal forces.
Which of the following is the MOST critical factor in achieving a good marginal seal with a composite resin restoration?
Answer: Proper acid etching and bonding technique
Proper acid etching creates micro-tags in enamel and dentin, and the bonding agent seals the interface, which is essential for marginal integrity and reducing microleakage.