NBDHE NBDHE Scientific Basis of Practice 2

Question 1

Which nerve innervates the anterior two-thirds of the tongue for general sensation?

Accepted Answer

Lingual nerve (V3)

Answer

The lingual nerve, a branch of V3, carries general somatic sensation from the anterior two-thirds of the tongue.

Question 2

Which immunoglobulin is the predominant antibody found in saliva and provides mucosal immunity?

Accepted Answer

IgA

Answer

Secretory IgA is the dominant immunoglobulin in saliva and other mucous secretions, providing first-line mucosal defense.

Question 3

During tooth development, which process involves the differentiation of odontoblasts that then produce predentin?

Accepted Answer

Histodifferentiation

Answer

Histodifferentiation is the stage in which undifferentiated cells acquire specialized functions, including odontoblast differentiation leading to dentin formation.

Question 4

Warfarin inhibits which vitamin-dependent clotting factors?

Accepted Answer

Factors II, VII, IX, X

Answer

Warfarin blocks vitamin K epoxide reductase, impairing carboxylation of factors II, VII, IX, and X.

Question 5

Which bacterium is the primary etiologic agent of early childhood caries?

Accepted Answer

Streptococcus mutans

Answer

Streptococcus mutans is the principal pathogen in early childhood caries due to its acidogenicity and ability to colonize smooth surfaces.

NBDHE Test Practice Test

NBDHE Test Practice Test

NBDHE NBDHE Scientific Basis of Practice 2