Module 3

Question 1

Define the cementum

Answer 1

calcified layer of connective tissue that makes up the outer covering of the root surface and provides the means of attachment for the connective tissue fibers to the tooth surface

Question 2

How many types of cementum are there?

Answer 2

4

Question 3

What are the 2 main types of cementum?

Answer 3

acellular and cellular

Question 4

throughout life cementum __________ in thickness

Answer 4

increase

Question 5

What seals the open tubules and protects the dentin

Answer 5

cementum

Question 6

what attaches the periodontal fibers to the tooth

Answer 6

cementum

Question 7

cementum helps compinsate for _________ to maintain vertical dimension of periodontium through the formation of secondary cementum

Answer 7

attrition

Question 8

What is largely mineralized with densely packed collagen fibers and ground substance

Answer 8

mature cementum

Question 9

Cementum has direct blood vessels or nerves T/F

Answer 9

False

Question 10

______ and ______ participate in the formation of cementum

Answer 10

fibroblasts and cementoblasts

Question 11

What are largely involved in production of acelluar extrinsic cementum

Answer 11

PDL fibroblasts

Question 12

What is acelluar cementum also known as?

Answer 12

Primary

Question 13

Where is acelluar cementum found?

Answer 13

entire root, but primarily occupies cervical or coronal thrid of all deciduous and permanent teeth

Question 14

__________ is found at most cervical enamel border

Answer 14

Acellular, afibrillar cementum (AAC)

Question 15

__________ forms both pre/post eruptively and derived from fibroblasts

Answer 15

Acelluar extrinsic fiber cementum (AEC)

Question 16

What makes up most of the structre of AEC

Answer 16

Sharpey’s fibers, mineralized surface

Question 17

What has a principle role in supporting/anchoring the tooth?

Answer 17

acellular cementum (AEC)

Question 18

Sharpey’s fibers are _______ except near the CEJ where they are partially

Answer 18

calcified

Question 19

How thick is the Acelluar Cementum (AEC)

Answer 19

30 to 60 microns

Question 20

What is another name for celluar cementum?

Answer 20

secondary

Question 21

Celluar cementum is _________calcifed than acelluar type

Answer 21

Less

Question 22

WHen is celluar cementum formed?

Answer 22

after the tooth reaches the occlusal plane

Question 23

What are the characteristics of cellular cementum?

Answer 23

irregular, thicker, and can contain cells which can communicate with eachother

Question 24

Where is celluar cementum the thickest?

Answer 24

in the apical half and furcation regions of the root

Question 25

Celluar cementum is depositied and resorbed in response to functional demand T/F

Answer 25

True

Question 26

_________ contains no sharpeys fibers

Answer 26

celluar intrinsic fiber cementum (CIC)

Question 27

_________ does contain some sharpeys fibers, is also comprised of the acellular extrinsic fiber cementum

Answer 27

cellular mixed fiber cementum (CMF)

Question 28

How thick is cellular cementum?

Answer 28

150 - 200 microns

Question 29

why is it important to know about cementum?

Answer 29

- help patients understand perio health | - we can remove cementum

Question 30

What is root planing?

Answer 30

intentional removal of cementum

Question 31

What is root debridement?

Answer 31

try to avoid removal of cementum

Question 32

What happens if there is no cementum

Answer 32

no attachment of fiber bundle= mobility and tooth loss

Question 33

_____ cementum overlaps enamel

Answer 33

60%

Question 34

_______cementum meets enamel

Answer 34

30%

Question 35

______cementum gap from enamel

Answer 35

10%

Question 36

WHy is it imporant to know the percentages of CEJ

Answer 36

- fluoride use for sensitivity - instrumentation - caries

Question 37

Cementum is softer than______

Answer 37

bone, enamel or dentin

Question 38

What is the thickness of cementum?

Answer 38

varies thinner on coronal portion thicker on distal rather than mesial

Question 39

Where is the greatest thickness of cementum found?

Answer 39

apical, bifurcated and trifurcated areas

Question 40

What is ankylosis?

Answer 40

attachement of the cementum of the tooth to the alveolar bone

Question 41

WHen does ankylosis occur?

Answer 41

after chronic PA infectoin or occlusal trauma

Question 42

what is often seen with ankylosis?

Answer 42

resorbiton of root and replacement by bone tissue

Question 43

What does ankylosis do to the PDL?

Answer 43

obliterates it

Question 44

How do we detect ankylosis?

Answer 44

xray and clinically (tooth below height of occ plane)

Question 45

What is hypercementosis?

Answer 45

prominent thickening of the cementum

Question 46

Is hypercementosis localized or generalized

Answer 46

it can be both

Question 47

How do we dectect hypercementosis?

Answer 47

radiographically

Question 48

What is concrescence?

Answer 48

cemental union of 2 teeth

Question 49

Where is concrescence seen most frequently?

Answer 49

macially molar region

Question 50

Why does concrescence usually occur?

Answer 50

from excessive deposition of cementum, close proximity of teeth/roots

Question 51

What causes cementum resorbtion?

Answer 51

trauma, ortho movement, pressure from mal-aligned teeth, cysts and tyumors, perio disease

Question 52

Is cementum resorbtion local or systemic?

Answer 52

It can be both or can be idiopathic