NBDE Part II 2

Question 1

A patient presents with a periapical abscess on tooth #19. After incision and drainage, the most appropriate antibiotic of choice in a non-penicillin-allergic patient is:

Accepted Answer

Amoxicillin 500mg TID x 7 days

Answer

Amoxicillin is the first-line antibiotic for odontogenic infections in non-penicillin-allergic patients due to its broad-spectrum coverage of oral flora.

Question 2

During a class II amalgam preparation, which wall provides the most resistance to occlusal loading?

Accepted Answer

Pulpal floor

Answer

The pulpal floor provides the primary resistance form by being perpendicular to the long axis of the tooth and distributing occlusal forces.

Question 3

A 7-year-old child has avulsed tooth #8 (maxillary right central incisor, permanent). The tooth has been extraoral for 90 minutes in a dry environment. The best management is:

Accepted Answer

Do not replant; space maintenance only

Answer

Teeth with a dry extraoral time exceeding 60 minutes have non-viable periodontal ligament cells, and replantation is not recommended due to inevitable ankylosis and root resorption.

Question 4

Which local anesthetic has the longest duration of action and is commonly used for prolonged surgical procedures?

Accepted Answer

Bupivacaine 0.5%

Answer

Bupivacaine 0.5% provides up to 8–12 hours of pulpal anesthesia, making it ideal for lengthy oral surgical procedures and postoperative pain control.

Question 5

In periodontal disease classification, Stage III Grade C periodontitis is characterized by:

Accepted Answer

Severe bone loss with rapid progression and significant risk factors like smoking or diabetes

Answer

Grade C indicates rapid rate of progression and/or specific risk factors (e.g., smoking ≥10 cigarettes/day or HbA1c ≥7%), combined with Stage III's severe complexity factors.

NBDE - National Board Dental Examination Practice Test

NBDE - National Board Dental Examination Practice Test

NBDE Part II 2