Cementum

Question 1

What is cementum?

Answer 1

Part of the periodontium that cover the root dentine and attaches the teeth to the alveolar bone by providing attachment to periodontal ligament.
Similar to bone - collagen matrix, lamellar arrangement.
Laid down by cementocytes.

Question 2

Where is acellular cementum?

Answer 2

Adjacent to dentine.
Primary cementum .
No cells!

Question 3

Where is cellular cementum?

Answer 3

In apical part of root and in furcation regions.
Secondary cementum.
Contains cementocytes.

Question 4

What is acellular extrinsic fibre cementum?

Answer 4

Collagen fibres from PDL (sharpey’s).
Primary acellular cementum equivalent.
Cervical 2/3 of roots.

Question 5

What is cellular intrinsic fibre cementum?

Answer 5

NO sharpey's fibres.
No role in tooth attachment.
Intrinsic collagen parallel to surface.
Secondary cellular cementum equivalent.
May represent as a transitional form.