Cementum

Question 1

On wet - weight basis cementum is :

Answer 1

65% inorganic
23% organic
12% water 💦

Question 2

By volume it contains

Answer 2

45% inorganic
33% organic
22% water 💦

Question 3

Principal inorganic component is :

Answer 3

Hydroxyopatite crystal

Question 4

Principal inorganic component is :

Answer 4

Hydroxyopatite crystal

Question 5

Hydroxyopatite crystals are :

Answer 5

✓ 55nm wide and 8nm thick
✓other forms of Ca at higher levels in enamel and dentin

Question 6

Fluoride levels higher in ?

Answer 6

Acellular than in cellular cementum

Question 7

Fluoride levels higher in ?

Answer 7

Acellular than in cellular cementum

Question 8

Organic matrix is of primarily?

Answer 8

Type I collagen ( III , V ,VI , XII also found in small quantities )

Question 9

Fluoride levels in cementum are :

Answer 9

Higher than any of other mineralized tissues

Question 10

Cementum - derived attachment protein ( CAP ) is ?

Answer 10

✓56 KDA or 65 KDA

✓Collagenous protein in cementum

✓Promote attachment of mesenchymal cells to extracellular matrix

Question 11

Cap is present in

Answer 11

Matrix of mature cementum and in cementoblast ( not in bone )

Question 12

It may be a marker to differentiate Bond and cementum?

Answer 12

CAP

Question 13

Cementum is rich in GAGS , predominantly :

Answer 13

chondroitin sulphate

Question 14

GAGS located around ?

Answer 14

Lacunae of cementum

( Dermatan sulphate and hyaluronan ) Can be found

Question 15

Among the proteoglycans found in cementum are:

Answer 15

Lumican / versican / decorin/ fibromodulin / biglycan

Question 16

Proteoglycan are located in ?

Answer 16

Peripheries of lacunae and canaliculi

Question 17

Non- collagenous elements which are found are ?

Answer 17

✓Sialoproteins/ dentin sialoproteins/ fibronectin/ tenascin/osteopontin and other cementum- specific elements involved in PDL reattachment or mineralization

✓Such molecules contain well recognized addition domain arginine-glycine- aspartic acid that target specific integrin receptors on cells

Question 18

Sialoproteins located in :

Answer 18

Cementum matrix

Question 19

Osteopontin present in ?

Answer 19

Incremental lines

Question 20

Which zones may be more highly calcified than dentine

Answer 20

Acellular zones

Question 21

Which zones may be more highly calcified than dentine

Answer 21

Acellular zones

Question 22

Cellular cementum 🤫

Answer 22

✓ contain cells ( cementocytes )

✓found mainly in the apical area overlying the acellular cementum

✓ formed after acellular cementum
✓ Also known as secondary cementum
✓ Found in interradicular areas
✓Faster rate of matrix formation
✓ As it develops , the formative cells become embedded in tissues as cementocytes
✓ precementum layer present ✅
✓more widely spaced incremental lines , thicker and more irregular

Question 23

Acellular cementum

Answer 23

✓doesnot contain cells ( cementocytes )

✓Being formed first , it is known as primary cementum

✓Acellular cementum Is relatively structureless

✓in the outer region off radicular dentin the granular layer ( of Tomes ) can be seen outside, the hyaline layer

✓A dark line may be discerned / observed between the hyaline layer and acellular cementum that is patchily present at this position called as afibrillar cementum

Question 24

The arrangement at the apical region of root is a layer of cementum overlying ?

Answer 24

Acellular cementum

Question 25

They are more widely dispersed and more randomly arranged ?

Answer 25

Cementocytes

Question 26

Cementum is deposited in irregular rhythm resulting in unevenly spaced?

Answer 26

Incremental lines

Question 27

Lines are further apart thicker and more irregular in ?

Answer 27

Cellular cementum

Question 28

Lines are closed together thin and even in ?

Answer 28

Acellular cementum

Question 29

Incremental lines are visible in ?

Answer 29

Decalcified sections

Question 30

Incremental lines are rich in

Answer 30

Osteopontin ( might aid the cohesion / Linkage of matrix molecules at these sites )

Question 31

Spaces that the cementocytes occupy in cellular sumatum are called?

Answer 31

Lacunae

Question 32

The process of symmetric side extend along channels are the ?

Answer 32

Canaliculi

Question 33

Adjacent canaliculi are often connected and the process within them exhibit?

Answer 33

Gap junctions

Question 34

In ground section , the cellular contents are lost , air and debris filling the voids to give the ?

Answer 34

Dark appearance