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BDS2 Oral Biology - Histology > (1) Anatomy and Histology of the Periodontium - cementum > Flashcards

(1) Anatomy and Histology of the Periodontium - cementum Flashcards

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1
Q

What is cementum?

A

thin layer of calcified tissue covering radicular dentine.

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2
Q

How thick is cementum at the cervical?

A

10-15µm in thickness.

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3
Q

How thick is cementum cervically?

A

50-200µm thick

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4
Q

How thick could cementum be at the root apex?

A

600µm

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5
Q

What does cementum adhere to?

A

Adheres to dentine and to the periodontal ligament.

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6
Q

What is the name of the dentin at the root?

A

redicular dentin

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7
Q

What cementum capable of doing?

A

repair and regeneration

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8
Q

When is cementum formed?

A

Formed throughout life

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9
Q

Can the cementum detach and reattach to the periodontal ligament?

A

allowing re- attachment of the periodontal ligament.

as it is formed throughout life

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10
Q

What structure is cementum similar to?

A

bone

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11
Q

What is the difference between bone and cementum composition?

A

Similar to bone in composition, but not innervated and avascular

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12
Q

What colour is cementum?

A

pale yellow and has a dull surface

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13
Q

Where can cementum be easily abraded?

A

cervically

e.g. gum recession can expose cementum

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14
Q

What are the 2 types of cementum?

A

cellular
acellular

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15
Q

What does cellular cementum contain?

A

cementocytes

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16
Q

What does acellular cementum cover?

A

dentine

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17
Q

Where is cellular cementum located?

A

apical area
inter-radicular areas overlying acellular cementum

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18
Q

In general what cementum forms first?

A

acellular

closest to the dentin

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19
Q

What type of section is this?

A

decalcified

see cells

20
Q

At what pace does cementum form?

A

slowly

21
Q

Name structures A-D and what do the black and white arrows point to?

A

A) Acellular cementum.
B) Cellular cementum. C) Pre-cementum.
D) Periodontal ligament.

White arrows point to cementocytes.

Black arrows point to cementoblasts.

22
Q

How do you define acellular cementum?

A

lines in it from slow growth

shown by A

acellular is always closest to the dentin

23
Q

How do you differentiate cellular and acellular cementum ?

A

the cellular cementum has cementocytes

shown by white arrows

24
Q

Where do cementocytes live?

A

in cellular cementum

Cementocytes live in the lacunae of cementum,

25
Q

What is C?

A

C = pre-cementum

newly formed cementum, not calcified yet

26
Q

What is black arrow pointing to?

A

cementoblasts

line the pre-cementum

will form the cementum

27
Q

What happens when cementoblasts get trapped in their own secretion?

A

they become calcified and become cementocytes

white arrow

28
Q

What section is this an example of?

A

ground section, cementocytes appear black in a ground section.

29
Q

What type of cementum is shown here?

A

cellular, decalcified

30
Q

What is the black substance here?

A

if there is a space, e.g. lacunae it will appear black

due to the light reflection

31
Q

In cementum, what direction do the canaliculi of cementum face?

A

one direction

both the cementoblasts and cementocytes

32
Q

What is a canaliculi?

A

a canaliculus is a small passageway

33
Q

Where do the nutrients for the cementocytes come from?

A

the periodontal ligament

as the cementum and dentin are unvascularised and not inervated

34
Q

When the cementum become thicker and thicker, what do the cementocytes do?

A

they try to extend their processes through longer and longer canaliculi, which are projected in one direction.

towards the periodontium

35
Q

What side is the periodontal ligament?

A

to the left

tooth to the right

shown by the direction of the canaliculi

36
Q

What is the most important function of cementum?

A

Attachment to the periodontal ligament?

37
Q

What type of section is this?

A

decalcified

38
Q

What type of cementum is attached to the periodontal ligament?

A

acellular

39
Q

Name structures A-C

A

A = enamel space (decalcified enamel)
B= dentin
C = acellular cementum (cervical so thin)

40
Q

Name structure A

A

periodontal ligament

41
Q

What is the periodontal ligament composed of?

A

principal fibres

42
Q

What do the fibres of the periodontal ligament connect?

A

the alveolar bone and the cementum

43
Q

What are the periodontal ligament fibres called when they insert into the alveolar bone?

A

sharpeys fibres

44
Q

How do the fibres of the periodontal ligament insert into the cementum?

A

precementum forms before it is calcified, the principal fibres insert into the cementum which later becomes fully calcified and anchors Sharpeys fibres into the cementum

45
Q

What side of the periodontal ligament has coarser sharpeys fibres?

A

the ones inserted into the alveolar bone

46
Q

Name structures A-C and the black and white arrows

A

decalcified section

A = Dentine.
B= Periodontal ligament.
C= Alveolar bone

White arrows point to acellular cementum.

Black arrows point to Sharpey’s fibres in alveolar bone

BDS2 Oral Biology - Histology (27 decks)

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