Part II 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 Part II flashcards as text
A 10-year-old patient has a pulp exposure on tooth #19 (mandibular first permanent molar) due to caries. The tooth is asymptomatic and radiographs show no periapical pathology. The treatment of choice is:
Answer: Pulpotomy with mineral trioxide aggregate (MTA)
MTA pulpotomy is the treatment of choice for carious pulp exposures in young permanent teeth with closed or open apices, providing the best success rates for vital pulp therapy.
Which of the following describes the working width (apical enlargement) principle during root canal preparation?
Answer: The canal should be enlarged at least 3 ISO sizes larger than the first file to bind at the apex
Enlarging at least 3 ISO sizes beyond the initial apical binding file ensures adequate debridement and disinfection of the apical third.
Which class of malocclusion is characterized by a mesially positioned mandibular first molar relative to the maxillary first molar?
Answer: Class III
Angle Class III malocclusion is defined by the mesiobuccal cusp of the maxillary first molar occluding posterior to the buccal groove of the mandibular first molar, indicating a mesial molar relationship.
Which type of bone graft has both osteogenic and osteoinductive properties and is considered the gold standard in periodontal regeneration?
Answer: Autograft from the iliac crest or intraoral sites
Autografts contain living osteogenic cells and growth factors, providing osteogenesis, osteoinduction, and osteoconduction — the only graft with all three properties.
A dentist notices an asymptomatic, well-defined unilocular radiolucency at the apex of a vital tooth #8. The MOST likely diagnosis is:
Answer: Nasopalatine duct cyst
The nasopalatine duct cyst appears as a heart-shaped or round radiolucency between the maxillary central incisors in a vital tooth and is the most common non-odontogenic cyst of the jaws.
During an inferior alveolar nerve block, which muscle is the target landmark for needle insertion depth?
Answer: Medial pterygoid muscle
The needle is advanced through the pterygomandibular space toward the mandibular foramen, using the medial pterygoid muscle as the posterior border landmark for injection depth.
A patient with poorly controlled Type 2 diabetes presents for periodontal therapy. Which of the following is the most accurate bidirectional relationship between diabetes and periodontitis?
Answer: Periodontitis increases insulin resistance, and diabetes impairs the host immune response to periodontal pathogens
The relationship is bidirectional: hyperglycemia impairs neutrophil function and increases cytokine production, while periodontal inflammation worsens insulin resistance through systemic inflammatory mediators.