Odontogenic cysts - dentigerous cysts & eruption cysts

Question 1

what is a dentigerous cysts?

Answer 1

a cysts which encloses part of all of the crown of an unerupted tooth fully or partially

Question 2

What is the dentigerous cysts attached to?

Answer 2

CEJ

Question 3

Where does the dentigerous cysts arise from/originate?

Answer 3

reduced enamel epithelium

Question 4

Is this cysts well demarcated?

Answer 4

yes

Question 5

Who is most affected by dentigerous cysts?

Answer 5

wide age range

male:female 2:1

Question 6

does the mandible or maxilla more commonly have dentigerous cysts?

Answer 6

mandible 2:1 maxilla

Question 7

What teeth are the dentogerous cysts associated with?

Answer 7

impacted teeth

supernumerary teeth

odontomes

Question 8

The order of teeth most affected by dentigerous cysts?

Answer 8

man 3rd molars

max canines

max 3rd molars

man premolars

Question 9

Do you have symptoms with a dentigerous cysts?

Answer 9

no

asymptomatic

Question 10

How do you usually discover dentigerous cysts?

Answer 10

incidental fining on radiograph

or why a tooth hasn’t erupted yet or why a primary tooth hasnt shed yet

Question 11

When do you have pain with a dentigerous cyst?

Answer 11

only if superimposed by inflammation

Question 12

Can a dentigerous cysts cause distortion to bone?

Answer 12

if it is there for some time it expands and causes bone distortion

Question 13

How do dentigerous cysts appear radiographically?

Answer 13

well defined uniocular radiolucency

associated with crown of an unerupted tooth

involved tooth might be displaced

Question 14

unilocular?

Answer 14

single chamber or cavity

Question 15

EXAM: describe radiographic presentation of a cyst?

Answer 15

• unilocular or multilocular
• well-defined or poorly defined
• radiolucent or radiopaque
• location
• special feature e.g. associated with crown of unerupted tooth
• corticated

Question 16

3 hypothesis of how the dentigerous cyst arises form the reduced enamel epithelium?

Answer 16

1) increased venous pressure around the enamel epithelium causes influx of fluid between the tooth and the reduced enamel epithelium
= cysts formation

2) most likely
- proliferation of outer layers of reduced enamel epithelium
- breakdown of central cells within epithelium
= cyst formation

3) infection form primary tooth to secondary tooth when it is unerupted
- usually premolar teeth
- more common in mandible

• more a an inflammatory cysts rather than developmental

Question 17

How does the dentigerous cyst expand?

Answer 17

similar to radicular cysts

bone resorption

hypertonicity of the cyst contents

fast enlargement in children

slower in adults

Question 18

Do older or younger pts have faster cysts expansion?

Answer 18

children faster

Question 19

2 types of nacroscopic features of dentigerous cysts?

Answer 19

central

lateral

Question 20

central type of dentigerous cyst?

Answer 20

surround whole crown

Question 21

lateral type of dentigerous cyst?

Answer 21

projecst laterally form thesode of the tooth

Question 22

type of dentigerous cyst?

Answer 22

central

Question 23

Describe the lining of the dentigerous cyst?

Answer 23

non-keratinised stratifies squamous epithelium

2-5 cells thick

thin

irregular

similar to reduced enamel epithelium

Question 24

Does the capsule have inflammation?

Answer 24

no - a non-inflammatory cyst

Question 25

If the cysts persists over time, what can occur?

Answer 25

mucous cell metaplasia - usually does not occur

cholesterol clefts

Question 26

cysts contents?

Answer 26

proteinaceous yellow fluid

cholesterol crystals - shimmering effect

cysts at CEJ

Question 27

What is it called when the dentigerous cysts enters the oral cavity?

Answer 27

eruption cyst

Question 28

What is show?

Answer 28

eruption cyst

Question 29

What is an eruption cyst?

Answer 29

a true dentiogerous cyst in an extra-alveolar location

Question 30

What is the appearance of an eruption cyst?

Answer 30

bluish fluctuant swelling on the alveolar mucosa

Question 31

When does the eruption cysts become brown?

Answer 31

biting/trauma cause bleeding and brown appearance - inflammation caused