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 finish line preparation design provides the best esthetic result for an all-ceramic crown?
Answer: Deep chamfer or shoulder
A deep chamfer or shoulder finish line provides adequate bulk of ceramic material at the margin for optimal esthetics and strength.
The Kennedy Class II modification 1 removable partial denture indicates:
Answer: Unilateral posterior edentulous area with one anterior modification space
Kennedy Class II is a unilateral posterior edentulous area, and modification 1 indicates one additional edentulous area elsewhere in the arch.
The resistance form in cavity preparation primarily prevents:
Answer: Fracture of the tooth or restoration under occlusal loading
Resistance form consists of features that prevent fracture of both the tooth structure and the restorative material under occlusal forces.
When fabricating a complete denture, the vertical dimension of occlusion (VDO) differs from the vertical dimension of rest (VDR) by approximately:
Answer: 1-2 mm (freeway space)
The freeway space (interocclusal rest space) is typically 2-4 mm, so VDO is approximately 2-4 mm less than VDR.
A cast metal post and core is contraindicated when:
Answer: The remaining root structure is less than 1 mm thick at any point
Roots with less than 1 mm of dentin thickness at any point risk perforation or fracture during post preparation or cementation.
Which occlusal scheme is most appropriate for a completely edentulous patient with a flat (atrophic) mandibular ridge?
Answer: Bilateral balanced occlusion
Bilateral balanced occlusion distributes forces evenly across both sides during all excursive movements, improving stability on flat ridges.
The smear layer created during cavity preparation should be treated before placing a dentin bonding agent because it:
Answer: Increases microleakage by acting as a diffusion barrier
The smear layer is a weak, loosely adherent layer that acts as a diffusion barrier and reduces bond strength if not removed or modified.