NBDE Ultimate 5

Question 1

Which nerve provides general somatic afferent (taste-independent sensory) innervation to the anterior two-thirds of the tongue?

Accepted Answer

Lingual nerve (branch of CN V3)

Answer

The lingual nerve (a branch of the inferior alveolar nerve from V3) carries general sensation from the anterior two-thirds of the tongue; taste is carried by the chorda tympani.

Question 2

Which major salivary gland produces an almost entirely serous secretion?

Accepted Answer

Parotid gland

Answer

The parotid gland is composed almost exclusively of serous acini, producing watery, enzyme-rich saliva, including amylase.

Question 3

The correct chemical formula for hydroxyapatite, the principal mineral of enamel and bone, is:

Accepted Answer

Ca10(PO4)6(OH)2

Answer

Hydroxyapatite has the formula Ca10(PO4)6(OH)2 and constitutes approximately 96% of mature enamel by weight.

Question 4

Hertwig's epithelial root sheath (HERS), which dictates root morphology and initiates cementogenesis, is derived from:

Accepted Answer

Inner and outer enamel epithelium at the cervical loop

Answer

HERS forms from the proliferation and fusion of the inner and outer enamel epithelium at the cervical loop, growing apically to shape the root.

Question 5

The inferior alveolar nerve, after supplying the mandibular teeth, exits the mandible as the mental nerve through the:

Accepted Answer

Mental foramen

Answer

The terminal branch of the inferior alveolar nerve exits the mental foramen (typically between the premolar apices) as the mental nerve, supplying the chin and lower lip.

NBDE - National Board Dental Examination Practice Test

NBDE - National Board Dental Examination Practice Test

NBDE Ultimate 5