Cementum Flashcards
1
Q
What does cementum do?
A
- Covers root dentine
- crown dentine covered by enamel
- Provides attachment for some periodontal fibres (min function)
2
Q
Why does cementum have a very similar structure to bone?
A
- Collagen matrix
- Lamellar arrangement (layers of tissue)
3
Q
What is cementum laid down by?
A
Cementocytes
4
Q
What are the 2 types of cementum?
A
- Cellular
- Acellular
5
Q
What are the characteristics of acellular cementum?
A
- No cells within
- Usually adjacent to dentine
- First formed (primary cementum)
6
Q
Which type of cementum is primary cementum?
A
Acellular cementum
7
Q
What are the characteristics of cellular cementum?
A
- Contains cementocytes
- Later formed (secondary cementum)
- Present in apical part of root and in furcation regions
8
Q
Which type of cementum is secondary cementum?
A
Cellular cementum
9
Q
What is a furcation region?
A
Where the roots divide (region in between the roots)
10
Q
What are Sharpey’s fibres and what do they do?
A
Periodontal fibres - attaches tooth to soft tissue
11
Q
What is acellular extrinsic fibre cementum?
A
- Collagen fibres from PDL (Sharpey’s fibres)
- Equivalent to primary acellular cementum
- Present on cervical 2/3 of roots
12
Q
What is cellular intrinsic fibre cementum?
A
- 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
