Ultimate 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 Ultimate flashcards as text
The recommended pulpal depth for a Class I cavity preparation using amalgam is approximately:
Answer: 0.5 mm into dentin
A Class I amalgam preparation should extend approximately 0.5 mm into dentin to ensure adequate pulpal depth (~1.5-2 mm total) for bulk and retention.
Which impression material is considered the gold standard for fixed prosthodontic impressions?
Answer: Polyvinyl siloxane (addition silicone)
Polyvinyl siloxane (addition silicone) offers superior dimensional stability, excellent detail reproduction, and extended pour time, making it ideal for fixed prosthodontic impressions.
Compared to a permanent molar, a primary molar pulp is characterized by:
Answer: More prominent pulp horns and thinner dentinal walls
Primary molars have proportionally larger pulp chambers, more prominent (coronally positioned) pulp horns, and thinner dentinal walls, increasing pulp exposure risk during cavity preparation.
Formocresol pulpotomy in a primary molar is indicated when:
Answer: The radicular pulp is vital and hemorrhage is controlled
Formocresol pulpotomy is indicated when the coronal pulp is inflamed but radicular pulp remains vital, asymptomatic, and hemostasis is achievable after amputation.
The primary mechanism by which acid etching improves composite resin bonding to enamel is:
Answer: Micromechanical retention through resin tag formation
Acid etching creates microporosities in enamel by selectively dissolving prism cores or peripheries, allowing resin monomers to penetrate and form resin tags for micromechanical retention.
Which Class of cavity preparation, according to Black's classification, involves pit and fissure lesions on the occlusal surfaces of posterior teeth?
Answer: Class I
Class I cavity preparations involve pits and fissures on occlusal surfaces of molars and premolars, lingual surfaces of maxillary incisors, and buccal surfaces of molars.
A full cast gold crown preparation requires a minimum axial wall reduction of approximately:
Answer: 1.5 mm
Full cast gold crown preparations require at least 1.5 mm of axial reduction to provide adequate metal thickness for strength while maintaining tooth structure.