Prosthodontics and Operative 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 Prosthodontics and Operative Dentistry flashcards as text
Which type of pontic design is most hygienic for a fixed partial denture in the posterior region?
Answer: Sanitary (hygienic) pontic
The sanitary (hygienic) pontic does not contact the residual ridge at all, making it the easiest to clean and most tissue-friendly design.
During the preparation of an MOD cavity for a Class II amalgam restoration, the proximal box should be extended faciolingually until:
Answer: The margins are in a self-cleansing area just clear of the adjacent tooth
Proximal margins must extend just beyond the contact area to a self-cleansing zone where instruments can finish margins and caries risk is reduced.
The primary advantage of using a facebow transfer when mounting casts for complete denture fabrication is that it:
Answer: Relates the maxillary cast to the hinge axis of the articulator mimicking the patient's TMJ
A facebow transfer records the spatial relationship of the maxilla to the transverse hinge axis so the casts open and close on the articulator as they would in the patient.
Which cavity preparation principle was modified by GV Black's successors to adopt a more conservative 'extension for prevention' approach?
Answer: Outline form (extension for prevention)
GV Black's 'extension for prevention' placed margins in self-cleansing areas even in caries-free zones; modern adhesive dentistry restricts preparation to only carious or defective structure.
A patient with xerostomia and multiple cervical carious lesions is best restored with:
Answer: Resin-modified glass ionomer cement
Resin-modified glass ionomer releases fluoride, bonds chemically to dentin, and tolerates mild moisture — ideal for xerostomic patients with high caries risk.
When designing a maxillary complete denture, the post-dam (posterior palatal seal) is placed:
Answer: At the junction of the hard and soft palate on the vibrating line
The post-dam is placed at or slightly anterior to the vibrating line (junction of movable and immovable soft palate tissue) to create a peripheral seal.
A direct composite veneer differs from a porcelain veneer primarily in that:
Answer: Direct composite is placed chairside in a single visit without a laboratory step
Direct composite veneers are a single-visit, freehand chairside procedure requiring no laboratory fabrication, making them more time- and cost-efficient initially.