NBDE Knowledge 2

Question 1

Which type of collagen is predominantly found in the periodontal ligament?

Accepted Answer

Type I

Answer

Type I collagen is the major collagen in the periodontal ligament, providing tensile strength.

Question 2

The foramen cecum of the tongue marks the site of origin of which structure?

Accepted Answer

Thyroglossal duct

Answer

The foramen cecum is the embryologic remnant of the thyroglossal duct from which the thyroid gland descended.

Question 3

Which pharmacological agent is most appropriate for reversing benzodiazepine overdose?

Accepted Answer

Flumazenil

Answer

Flumazenil is a competitive benzodiazepine receptor antagonist used to reverse benzodiazepine sedation.

Question 4

Which cell is primarily responsible for bone resorption?

Accepted Answer

Osteoclast

Answer

Osteoclasts are multinucleated cells derived from hematopoietic precursors that resorb bone via acid and proteolytic enzymes.

Question 5

A patient presents with inability to open the mouth widely after a mandibular block injection. This complication is best described as:

Accepted Answer

Trismus

Answer

Trismus is limited mouth opening due to muscle spasm or injury, often following inadvertent injection into the medial pterygoid muscle.

NBDE - National Board Dental Examination Practice Test