MFDS Oral Biology

Question 1

Which cells are responsible for forming dentine?

Accepted Answer

Odontoblasts

Answer

Odontoblasts are the specialised cells derived from neural crest cells that synthesise and secrete the organic matrix of dentine.

Question 2

What is the predominant inorganic component of enamel?

Accepted Answer

Hydroxyapatite

Answer

Hydroxyapatite [Ca10(PO4)6(OH)2] constitutes approximately 96% of the dry weight of mature enamel.

Question 3

Which type of collagen predominates in the pulp and dentine matrix?

Accepted Answer

Type I

Answer

Type I collagen is the major fibrillar collagen of dentine and pulp, providing tensile strength to the matrix.

Question 4

Hertwig's epithelial root sheath is derived from which structure?

Accepted Answer

Enamel organ

Answer

Hertwig's epithelial root sheath forms from the fusion of the inner and outer enamel epithelium at the cervical loop of the enamel organ.

Question 5

Which zone of the dental pulp is immediately deep to the odontoblast layer?

Accepted Answer

Cell-free zone of Weil

Answer

The cell-free zone of Weil (also called the subodontoblastic zone) lies immediately beneath the odontoblast layer and is characterised by a relative absence of cell bodies.

MFDS Part 1 Practice Test

MFDS Part 1 Practice Test

MFDS Oral Biology