Cementum

Question 1

What are the features of cementum

Answer 1

Covers root dentine​

Very similar in structure to bone​
-Collagen matrix​
-Lamellar arrangement​

Provides attachment for some periodontal fibres​

Laid down by cementocytes​ (cementoblasts)

Question 2

What are the two types of cementum

Answer 2

Cellular
Acellular

Question 3

Features of cellular cementum

Answer 3

Contains cementocytes
Later formed (secondary cementum)
Present in apical part of root and in furcation regions

Question 4

Features of acellular cementum

Answer 4

No cells within
Usually adjacent to dentine
First formed (primary cementum)
Contains collagen fibres

Question 5

Multiradicular

Answer 5

A tooth with more than one root EX molar

Question 6

Why can dentine be exposed but not cementum

Answer 6

cementum has no connection to live tissues while dentine has tubules which lead directly to pulp which means dentine is more susceptible to pain

Question 7

What is the purpose of periodontal fibres

Answer 7

Fibres which connect tooth to alveolar bone as the tooth alone is floating inside the gingivas

Question 8

Properties of cellular intrinsic fibre cementum

Answer 8

-No Sharpey’s fibres​
-Intrinsic collagen fibres parallel to surface​
-Equivalent to secondary cellular cementum​
-No role in tooth attachment​
-May represent a transitional form​

Question 9

Acellular extrinsic fibre cementum

Answer 9

-Collagen fibres from PDL (Sharpey’s fibres)​
-Equivalent to primary acellular cementum​
-Present on cervical 2/3 of roots​

Question 10

Cementum is important because it can…

Answer 10

Compensate tooth wear by growing