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Oral Sciences > Reading 1/30 Cementum-Alveolar Bone > Flashcards

Reading 1/30 Cementum-Alveolar Bone Flashcards

1
Q

What makes up the periodontium?

A

Gingiva, root cementum, alveolar bone, PDL

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2
Q

2 parts to the gingiva:

A

gingival epi, gingival CT

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3
Q

This house the root:

A

alveolar bone

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4
Q

This cover the root:

A

cementum

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5
Q

Major component of root formation:

A

dentin

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6
Q

This allows for the laying down of dentin:

A

differentiation of odontoblasts

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7
Q

Cementum is the __ and __ of cementoblasts

A

origin and differentiation

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8
Q

2 parts of alveolar bone:

A

alveolar bone proper, supporting bone

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9
Q

What forms the Hertwig’s root sheath (HRS)?

A

IEE and OEE, after crown completion

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10
Q

Movement of crown w inc root length:

A

away from crypts

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11
Q

What is HRS?

A

bilayer

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12
Q

TF? Root lengthens at same rate tooth moves occlusally.

A

T

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13
Q

What surround the OEE?

A

ental folicle

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14
Q

These cells differentiate into odontoblast:

A

dental papilla cells in contact with IEE

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15
Q

Root development depends on what type of interaction?

A

epi-mesenchymal interaction

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16
Q

This leads to the production of HRS cells:

A

proliferation and downgrowth of IEE and OEE cells

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17
Q

These cell lay adjacent to the HRS cells during the downgrowth:

A

dental papilla cells

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18
Q

What lay above the DP cells during the downgrowth of the HRS cells?

A

differentiating odontolbasts

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19
Q

IEE cells of the HRS do this after crown formation is completed:

A

induce differentiation of Dp cells into preodontoblasts and odontoblasts, odontoblasts from root dentin bw crown dentin and HRS

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20
Q

FLow chart of differentiation starting at proliferation zone:

A

IEE(HRS), Dp cells, preodontoblasts, odontoblasts, root dentin, dentin

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21
Q

What happens as dentin formation continues:

A

root elongates, HRS becomes separated from crwn located at the apical end

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22
Q

At which end is the HRS located during root formation?

A

apical end

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23
Q

What happens after completion of root formation

A

HRS disappears, remnants form epi rest in PDL

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24
Q

Where do epi rests remain?

A

in the PDL

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25
Cementum is what type of tissue:
thin, mineralized
26
Cementum covers:
root dentin surface
27
is cementum vascular or avascular?
avascular
28
Function of cementum:
anchors PDL collagen fibers to root
29
3 types of cementum:
intermediate, Acellular, cellular
30
Location of acellular cementum:
cervical 2/3
31
Location of cellular cementum:
apice 1/3
32
primary cementum:
acellular
33
2' cementum:
cellular
34
TF? Cementum contains more mineral that bone and dentin.
F. less than
35
Cementum is histologically similar to:
bone
36
What makes cementum similar to bone?
lacunae, incremental deposition line
37
Difference bw cementum and bone:
no Harvesian canals, no BV's or nerves
38
Organic composition of cementum, bone and dentin respectively:
50-55%,. 30-35%, 30%
39
Mineral composition of cementum, bone and dentin respectively:
45-50%, 60-65, 65.5%
40
Cementum is mainly composed of what type of collagen?
Type I (90%)
41
These are responsible for mineralization:
non-collagenous proteins
42
3 non-collagenous proteins involved in cementum mineralization
bone sialoprotein, osteocalcin, osteopontin
43
3 major organic components of cementum:
Type I collage, non-collagenous proteins, GAGs
44
2 types of GAGs found in cementum:
chondroitin sulfate, heparan sulfate
45
This make up the 50% inorganic part of cementum:
ca and phosphate: hydroxyapetite crystals
46
Arrange bone, enamel, cementum, and dentin from hardest to softest tisse
enamel (90%) > dentin (67%) > bone (50-60%) > cementum (45-50%)
47
Most common relation of cementum to enamel:
overlapping (60%)
48
2nd most common relation of cementum to enamel:
butt joint (30%), 10% w space bw C and E
49
Intermediate cementum is characterized by:
narrow zone of highly calcified amorphous tissue bw acellular cementum and dentin
50
Where is intermediate cementum found?
cemento-dentinal unction of roots
51
Is intermediate dentin a product of cementogenesis or dentinogenesis?
neither
52
Enamel matrix protein found in intermediate cementum is likely a product of:
HRS
53
Purported function of intermediate cementum:
reduce root sensitivity
54
How many groups of EM cells are present in the bell Stag?
2
55
Dental follicle cells lead to the formation of:
OEE cells, cementoblasts, PDL fibroblasts, Osteoblasts that form alveolar bone (check)
56
Acellular cementum covers:
root surface
57
These cells differentiate into cementoblasts:
dental follicle cells
58
When does the differentiation of dental follicle cells to cementoblasts begin?
right after predentin formation
59
TF? Cementum/ root dentin formation is coupled.
T
60
Function of acellular cementum:
provides attachment for the tooth
61
3 ways acellular cementum forms:
DF cells, pre-cementoblast differentiation, cementoblast differentiation on root (check)
62
Location of dental follicle cells that can lead to the formation of acellular cementum (ACC):
parallel to HRS
63
These cells can differentiate into pre-cementoblasts:
dental follicle cells
64
When do dental follicle cells differentiate into pre-cementobalsts?
upon pre-dentin formation
65
Is the migration of dental follicle cells to form predentin uni- or bi- directional?
uni
66
When do pre-cementoblasts differentiate into cementoblasts and form acellular cementum on root dentin surface?
When they reach root dentin
67
Cementum formation is couple with:
root dentin formation
68
Shape of the pre-cementuoblasts that migrate to the predentin:
fibroblast like shape
69
Shape of cementoblasts:
round (check)
70
Function of cementoblasts:
active synthesis, secretion of cementum matrix component on root and mineralize
71
3 major steps from dental follicle cells to dentin w embedded Sharpey's fibers:
Differentiation, migration, secretion
72
Function of acellular cementum:
connective attachemtn ofrmation during root formation
73
What do cementoblasts secrete:
cementum ad collagen fibrils bw Sharpey's fibers, non-collagenous matrix proteins that fill in space bw collagen fibers
74
Function of Sharpey's fibers:
attach to root dentin surface, anchor PDL collagen fibers to root surface
75
What are Sharpey's fibers?
Collagen fibers of PDL that are incorporated into cementum and alveolar bone
76
What completes cementum formation & CT attachment ot root surface?
mineralization of cementum, collagen and Sharpey's fibers
77
in which directions do incremental lines run?
parallel to the interfaces of ACC and Root dentin as well as interface bw ACC and PDL collagen fibers
78
Fate of HRS cells:
Epi rests
79
ER are in what?
PDL
80
What lines the interface bw the PDL and the ACC?
cementoblasts
81
When does acellular cementum formation convert to cellular cementum formation?
When 2/3 of root formation is completed, after acellular cementum formation once the tooth is in occlusion
82
What makes 2' cementum?
cells entrapped in matrix they secrete (check?)
83
Unique morphology of cellular cementum:
cementoytes within cementum: lacunae - cell body, canaliculi - cell processes
84
What are th cell bodies of cementocytes?
lacuna
85
What are the cell processes of cementocytes?
canaliculi
86
Function of cellular cementum:
adaptive role in response to tooth wear and movement
87
cellular cementum is assoc w:
repair and regeneration of periodontal tissue
88
When are reversal lines created?
during reversal from resorptive to formative phase,, cementum can repair itself
89
This repairs cementum:
cementum
90
Age-related changes of cementum:
CC inc, thickening the ACC< the area covered by cellular cementum inc, surface becomes more irregular, only surface layer of cementocytes visible, other lacunae appear empty

Oral Sciences (16 decks)

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