MFDS Oral Biology 3

Question 1

Dead tracts in dentine are caused by:

Accepted Answer

Degeneration of odontoblast processes

Answer

Dead tracts result from the death and retraction of odontoblast processes, leaving empty tubules that appear dark in ground sections.

Question 2

Which cells phagocytose bone and hard tissue in the periapical region during root resorption?

Accepted Answer

Odontoclasts

Answer

Odontoclasts (also termed dentinoclasts or cementoclasts) are multinucleate cells analogous to osteoclasts that resorb dental hard tissues.

Question 3

The incremental lines of von Ebner in dentine represent:

Accepted Answer

Daily growth increments

Answer

The lines of von Ebner are daily incremental lines in dentine reflecting the circadian rhythm of odontoblast secretion.

Question 4

Which type of cementum covers the apical third of the root and contains cells?

Accepted Answer

Cellular mixed stratified cementum

Answer

Cellular mixed stratified cementum is found predominantly at the apical third and furcation areas and contains cementocytes entrapped during rapid deposition.

Question 5

The principal fibres of the periodontal ligament that run obliquely and are most numerous are the:

Accepted Answer

Oblique fibres

Answer

Oblique fibres are the most numerous principal fibre group of the periodontal ligament, running from cementum to alveolar bone to resist axial forces.

MFDS Part 1 Practice Test

MFDS Part 1 Practice Test

MFDS Oral Biology 3