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Oral Biology > Cementum > Flashcards

Cementum Flashcards

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1
Q

what si cementum

A

mineralised tissue
etomesenhcymal (detail follicle origin)
tooth support
cover roots

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2
Q

what is the composition of cementum (mineral, matrix and water)

A

mineral - 65%
matrix - 23%
Water - 12%

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3
Q

how does cement differ from bone in respect to cells

A

cementum has <100Um live cells and >100Um dead cells

bone has all living cells

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4
Q

how does cementum differ to bone in respect of blood vessels and nerves

A

bone has blood vessels and nerves incorporated whilst cementum doesnt

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5
Q

what s of clinical importance of cementum vs bone remodelling

A

cementum is resistant to resorption but if late force will resorb
bone is easily remodelled imp in ortho

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6
Q

what cells are alive in cementum

A

cells close to surface (PDL) as near a blood supply as deeper they die

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7
Q

what ar the different ways a cementum can be around the cervical margin of a tooth

A

overlap 60%
but joint 30%
doesnt meet ervical margin (sensitivity) 10%

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8
Q

what si root development riven by

A

HERS

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9
Q

what des HERS actually do

A 
apical dev of inner and outer enamel epi 
root morphology 
inductive 
proliferates
disintegrate
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10
Q

what does HERS induce

A

root dentinogenesis

cementogenesis

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11
Q

where does HERS proliferate and disintegrate

A

proliferate - apically

disintegrates - cervically

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12
Q

how can some hers cells form cementobalast

A

epi/mesenchymal transformation

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13
Q

what are the 9 steps in cementum formtion

A

1 - HERS induces odontoblasts form
2 - predentine then dentine form HERS basal lamina breaks down
3 - Hers = enamel matrix P on to predentie
4 - EMP mineralise = hyaline layer
5 - Hers disintegrates
6 - induce follicle cells migrate to root surface and form cemetnoblasts
7 - cemnoblasts = cementum and retreat out
8 - cementum mineralise trap PDL
9 - cell rest malaise

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14
Q

where is the hyaline layer of hopewell smith

A

between dentine and cementum

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15
Q

is the hyaline layer mineralised

A

highly

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16
Q

how think is the hyaline layer

A

10 UM

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17
Q

what si the origin of the hyaline layer

A

matrix from

  • epi cells - EMP
  • ectomesenchymal cells
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18
Q

what is the role of the hyaline layer

A

induces cementoblast formtion

cements cementum onto tooth

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19
Q

what si the cementoblast origin

A 
Dental follicle 
maybe hERS (from eli-mesenchymal transformation)
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20
Q

what does the cementoblasts do in cemeitogeneis

A

migrate out
depo matrix
mineralise
trap PDL fibres

21
Q

what does he matrix consist of

A

collagen

ground sub

22
Q

are there matrix vesicles in mineralisation of cementum

A

no

23
Q

what are the classification of cells

A

cellular

acellular

24
Q

what are the features of acellular cementum

A

no cells
slow depo
close incremental lines
narrow precememtun

25
Q

what are the features of cellular components

A

cells in lacunae with canaliculi
rapid depo
incremental lines relatively far apart
wide precementum

26
Q

what are the two diff types of fibres

A

intrinsic
extrinsic
mixed
afibrillar

27
Q

what are the intrinsic fibres

A

fibres form cementoblasts
small
parallel to root surface

28
Q

what are the extrinsic fibres

A

incorp PDL fibres
sharply fibres
perp or oblique to root surface

29
Q

what is afibrillar

A

no fibres

30
Q

what is primary cememtnum

A

first formed cement

acellular

31
Q

what is secondary cementum

A

covers apical 2/3rd

32
Q

what is acellular extrinsic fibre cememtnum

A

sharply fibres from PDL
attachment
thicker apically
cover 2/3 root

33
Q

what is mixed fibre cementum

A 
bulk cellular component 
cemtocytes 
incremental lines of salter 
extrinsic sharply and intrinsic 
acellular 
slow formed
34
Q

what is cellular intrinsic fibre cementum

A

no attachment role

adaptive - apical and interradicular regios

35
Q

what is acellular fibrillar cementum

A 
on enamel surface 
local disrupt of REE
DF cells contact with enamel 
mineralised GS 
imp REE
no funcion
36
Q

what is acellular intrinsic fibre cememtum

A

first formed cementum
collagen from cementoblast
slow formation
15-20 Um thick

37
Q

Cementoblast line what

A

surface of cementum

38
Q

where are cemetoblasts

A

between PDL fibre bundles

39
Q

what des the presence of organelle reflect

A

activity

40
Q

what happens to cementoblasts when cementum formed rapidly

A

get trapped in own secretions

in lacunae and cyto

41
Q

whiter the little cell processes from cementocytes

A

canaliculi

project toward PDL

42
Q

what is the function of primary/acellular cememtnunm

A

anchorage

43
Q

what is the function of secondary/cellular cementum

A

adaptation
- cont eruption
- medial drift
rapidly laid down

44
Q

where is the acellular and cellular cementum

A

acellular more near cervical margin

cellular at bottom apex

45
Q

what is hypercemntosi

A

excess cementum
thicker at apex
hard to extract

46
Q

EMP = ?

A

hyaline layer

47
Q

hyaline layer = ?

A

induces cementoblast

diff from follicle = cementogeneis

48
Q

what aids attachment

A

acellular compone

49
Q

if REE breached what happens

A

follicle cells expo to epi prod induces follicle cells = cemetoblass = cementum

Oral Biology (23 decks)

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