DDS Dental Anatomy and Histology 2

Question 1

The gubernacular canal in the jaw bone transmits which structure during tooth eruption?

Accepted Answer

The gubernacular cord connecting follicle to oral epithelium

Answer

The gubernacular cord, a fibrous band connecting the dental follicle to the overlying oral epithelium, passes through the gubernacular canal to guide eruption.

Question 2

Which cell is responsible for the formation of the dental lamina?

Accepted Answer

Oral epithelial cells

Answer

The dental lamina arises from proliferation of the oral (ectoderm-derived) epithelium as it invaginates into the underlying ectomesenchyme.

Question 3

Hertwig's epithelial root sheath is derived from which two epithelial layers?

Accepted Answer

Inner enamel epithelium and outer enamel epithelium

Answer

Hertwig's epithelial root sheath is a double layer formed by the fusion of the inner and outer enamel epithelium at the cervical loop after crown formation.

Question 4

Rests of Malassez are remnants of which structure found in the periodontal ligament?

Accepted Answer

Hertwig's epithelial root sheath

Answer

After root formation, Hertwig's sheath disintegrates and leaves behind epithelial cell clusters called rests of Malassez within the PDL.

Question 5

The principal fibers of the periodontal ligament that run from the alveolar crest obliquely to insert into the root are called:

Accepted Answer

Oblique fibers

Answer

Oblique fibers are the most numerous PDL principal fibers, running obliquely from alveolar bone to cementum to resist masticatory forces.

DDS - Doctor of Dental Surgery Practice Test

DDS - Doctor of Dental Surgery Practice Test

DDS Dental Anatomy and Histology 2