NBDE Knowledge 3

Question 1

Which microorganism is most commonly associated with early childhood caries?

Accepted Answer

Streptococcus mutans

Answer

Streptococcus mutans is the primary pathogen in early childhood caries due to its acid production and ability to colonize tooth surfaces.

Question 2

Which of the following local anesthetics is classified as an amide?

Accepted Answer

Lidocaine

Answer

Lidocaine is an amide-type local anesthetic metabolized by the liver, while procaine, benzocaine, and tetracaine are esters.

Question 3

The blood supply to the maxillary anterior teeth is primarily provided by which artery?

Accepted Answer

Anterior superior alveolar artery

Answer

The anterior superior alveolar artery, a branch of the infraorbital artery, supplies the maxillary anterior teeth and surrounding tissues.

Question 4

In histology, the stratum granulosum of the oral epithelium is characterized by cells containing:

Accepted Answer

Keratohyalin granules

Answer

The stratum granulosum contains cells with basophilic keratohyalin granules that are precursors to the keratin filament matrix.

Question 5

Which vitamin deficiency is most associated with impaired wound healing and decreased collagen synthesis?

Accepted Answer

Vitamin C

Answer

Vitamin C (ascorbic acid) is essential for hydroxylation of proline and lysine in collagen synthesis; its deficiency causes scurvy and impaired wound healing.

NBDE - National Board Dental Examination Practice Test

NBDE - National Board Dental Examination Practice Test

NBDE Knowledge 3