NBDE Knowledge 5

Question 1

Which of the following is the correct order of tooth development stages?

Accepted Answer

Initiation, proliferation, histodifferentiation, morphodifferentiation, apposition, maturation

Answer

Tooth development proceeds in sequence: initiation → proliferation → histodifferentiation → morphodifferentiation → apposition → maturation.

Question 2

The mucogingival junction can be identified by:

Accepted Answer

A color change from pink keratinized gingiva to red alveolar mucosa

Answer

The mucogingival junction is a visible line demarcating the pale pink keratinized attached gingiva from the darker, more mobile alveolar mucosa.

Question 3

Nitrous oxide produces its analgesic and anxiolytic effects primarily by:

Accepted Answer

Activating opioid receptors and inhibiting NMDA receptors

Answer

Nitrous oxide analgesia is mediated through endogenous opioid release and NMDA receptor antagonism, not primarily through GABA-A receptors.

Question 4

Which of the following describes a true cyst?

Accepted Answer

A pathological cavity lined by epithelium

Answer

By definition, a true cyst is a pathological cavity lined by epithelium, distinguishing it from pseudocysts which lack epithelial lining.

Question 5

The resting membrane potential of a nerve cell is approximately:

Accepted Answer

-70 mV

Answer

The resting membrane potential of neurons is approximately -70 mV, maintained primarily by the Na+/K+ ATPase pump and selective membrane permeability.

NBDE - National Board Dental Examination Practice Test

NBDE - National Board Dental Examination Practice Test

NBDE Knowledge 5