NBDE Trivia 2 — Questions and Answers
Question 1: Which vitamin deficiency is most commonly associated with glossitis and angular cheilitis?
- Vitamin A
- Vitamin B2 (Riboflavin) (Correct answer)
- Vitamin C
- Vitamin D
Correct answer: Vitamin B2 (Riboflavin)
Riboflavin (B2) deficiency classically causes glossitis, angular cheilitis, and magenta tongue.
Question 2: The Wharton's duct is the excretory duct of which salivary gland?
- Parotid gland
- Sublingual gland
- Submandibular gland (Correct answer)
- Minor salivary glands
Correct answer: Submandibular gland
Wharton's duct drains the submandibular gland and opens at the sublingual caruncle.
Question 3: Which of the following organisms is the primary etiologic agent of acute necrotizing ulcerative gingivitis (ANUG)?
- Streptococcus mutans
- Treponema vincenti and Fusobacterium nucleatum (Correct answer)
- Porphyromonas gingivalis
- Actinomyces israelii
Correct answer: Treponema vincenti and Fusobacterium nucleatum
ANUG is caused by a fusospirochetal complex dominated by Treponema vincenti and Fusobacterium nucleatum.
Question 4: The gonion is a landmark located on which bone?
- Maxilla
- Zygomatic bone
- Mandible (Correct answer)
- Temporal bone
Correct answer: Mandible
Gonion is the most posterior-inferior point of the mandibular angle, used in cephalometric analysis.
Question 5: Which pulp test uses carbon dioxide snow or ethyl chloride to assess pulp vitality?
- Electric pulp test
- Cold test (Correct answer)
- Heat test
- Percussion test
Correct answer: Cold test
Cold testing with CO2 snow or ethyl chloride stimulates A-delta fibers to evaluate pulp sensibility.
Question 6: Fordyce spots in the oral cavity represent which normal anatomical variant?
- Accessory salivary gland ducts
- Ectopic sebaceous glands (Correct answer)
- Lingual tonsil tissue
- Minor mucous retention cysts
Correct answer: Ectopic sebaceous glands
Fordyce spots are ectopic sebaceous glands appearing as yellowish-white papules on the buccal mucosa or lips.
Question 7: Which local anesthetic has the longest duration of action among those commonly used in dentistry?
- Lidocaine
- Mepivacaine
- Bupivacaine (Correct answer)
- Prilocaine
Correct answer: Bupivacaine
Bupivacaine (Marcaine) provides the longest duration of pulpal and soft tissue anesthesia among common dental anesthetics.
NBDE Trivia 2
Which vitamin deficiency is most commonly associated with glossitis and angular cheilitis?