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
A dentist discovers a previously placed composite restoration has secondary caries confined to the margin. The MOST conservative management is:
Answer: Repair by selectively removing only the carious margin and rebonding
Selective repair of a marginal defect with secondary caries is the most conservative option, preserving sound tooth structure and the remaining sound restoration.
Glass ionomer cement releases fluoride primarily through which mechanism?
Answer: Sustained diffusion from the set material
Fluoride ions are entrapped within the set glass ionomer matrix and are released by sustained diffusion over time, providing a caries-inhibiting effect.
Which of the following best describes the 'C-factor' in composite resin placement?
Answer: Ratio of bonded to unbonded surfaces in a cavity
The C-factor (configuration factor) is the ratio of bonded cavity walls to unbonded free surfaces; a higher C-factor increases polymerization shrinkage stress at the bond interface.
A patient presents with a fractured maxillary central incisor involving enamel and dentin without pulp exposure. The FIRST step in treatment is:
Answer: Cover exposed dentin with a sedative dressing and reassess pulp vitality
Exposed dentin should be protected and pulp vitality assessed before definitive restoration, as pulpal response can change in the weeks following trauma.
In pin-retained amalgam restorations, the most common complication associated with threaded pins is:
Answer: Dentinal crazing and cracking
Threaded pins create stress concentrations that cause dentinal crazing and microcracks as the pin is driven into dentin, potentially weakening the tooth.
Which of the following composite resin filler particle sizes provides the best combination of esthetics and wear resistance for posterior restorations?
Answer: Hybrid (microhybrid)
Hybrid composites combine multiple filler sizes to achieve both adequate wear resistance for posterior use and a smooth, esthetic surface finish.
When preparing a tooth for a ceramic veneer, the preparation depth on the facial surface should remain primarily within:
Answer: Enamel only
Veneer preparations should remain within enamel whenever possible because enamel provides better bonding for ceramic veneers and preserves the vitality of the tooth.