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BDS2 BAMS Oral Biology > Periodontium > Flashcards

Flashcards in Periodontium Deck (72)
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1

What is the periodontium?

the periodontium is the tissues surrounding and supporting the teeth

2

What does the periodontal tissues consist of

Cementum
Gingiva
Alveolar bone
Periodontal ligament

3

What are the functions of the periodontium

Retaining the tooth in its socket
Resisting masticatory loads and transferring them to the bone
As a defensive barrier protecting tissues against threats from the oral environment

4

What is the junctional epithelium

The physical barrier separating the body tissues from the oral environment

5

Why is the epithelial attachment in the oral environment unique

It is the only breach in the body's surface

6

What is cementum

Cementum is a bone like layer of mineralized tissue which is deposited incrementally on the surface of the root

7

How is cementum similar to bone

Both have a collagen matrix
Both have a lamellar arrangement

8

How is cementum different to bone

Cementum has a parallel lamellar arrangement whereas bone has a radial lamellar arrangement

9

What does cementum cover

root dentine

10

What does cementum provide attachment for

some periodontal fibres

11

What is cementum laid down by

cementoblasts

12

Describe cellular cementum

Contains cementocytes
Later formed
Present in the apical part of the root and furcation regions
Covers acellular cementum

13

Describe acellular cementum

No cells within it
Usually adjacent to dentine
First formed
Fibres of the PDL terminate here (sharpey's fibres)

14

Why is the presence of cellular/acellular cementum clinically relevant?

the responses to treatment will be different and so success rates of treatment is linked to the presence of acellular and cellular cementum

15

what are the alternative classifications of cementum based on the histological differences

acellular extrinsic fibre cementum
cellular intrinsic fibre cementum

16

describe acellular extrinsic fibre cementum

has collagen fibres from the PDL - sharpey's fibres
present on cervical 2/3 of the root

17

why is acellular extrinsic fibre cementum more successful when it comes to regeneration

it has the ability to produce anchorage which is relevant to the treatment of periodontitis

18

describe cellular, intrinsic fibre cementum

no sharpey's fibres
intrinsic collagen fibres parallel to surface
has no role in tooth attachment
may represent a transitional form

19

what makes alveolar bone different to normal bone

it is dependent for its development and persistence upon the presence of tooth

20

what does the cortical plate form?

the inner lining of tooth socket

21

what does the cancellous bone contain

marrow
blood vessels, nerves, lymph etc

22

what are volksman canals

they are small openings which supply the periodontal ligament with nutrients

23

what does the periodontal ligament contain

cells
extracellular matrix
fibres
nerves
blood vessels

24

what makes the extracellular matrix special

behaves as a viscoelastic gel - gives it capacity to return to its original shape

25

what is the extracellular matrix made up of

hyaluronate GAGs
glycoproteins
proteoglycans

26

what are the glycoproteins in the PDL matrix

fibronectin

27

what are the proteoglycans in the PDL matrix

proteodermatan sulphate
chondroitin/dermatin SO4 hybrid

28

what are the cells in the PDL

fibroblasts
cementoblasts
osteoclasts
cementoclasts
epithelial cells
defence cells

29

what do fibroblasts do in the PDL

they generate the infrastructure and upkeep it

30

what are the epithelial cells in the PDL

cell rests (or debris) of malassez