Odontogenic Cysts

Question 1

cyst (definition)

Answer 1

pathological cavity lines by epithelium and contains fluid

Question 2

2 types of inflammatory cysts

Answer 2

periapical (radicular) cyst
buccal bifurcation cyst

Question 3

inflammatory cysts happen because of

Answer 3

some inflammatory process

Question 4

most common odontogenic cyst

Answer 4

periapical cyst

Question 5

developmental cysts happen

Answer 5

de novo (by themselves)

Question 6

types of developmental odontogenic cysts

Answer 6

dentigerous cyst
eruption cyst
odontogenic keratocyst
orthokeratinized odontogenic cyst
gingival cyst of newborn
gingival cyst of adult
lateral periodontal cyst
glandular odontogenic cyst

Question 7

most common developmental cyst

Answer 7

dentigerous cyst

Question 8

source of cells for epithelial lining in periapical cyst

Answer 8

cell lining from rests of mallassex

Question 9

radiographic findings of periapical cyst

Answer 9

round to ovoid radiolucency
apex of non-vital tooth

Question 10

histopathological findings of periapical cyst

Answer 10

variably thick, non-keratinized stratified squamous epithelial lining

rushton bodies
sheets of foamy histocytes
cholesterol clefts
root canal fillings material

Question 11

treatment options for periapical cysts

Answer 11

1. enucleation with extraction
2. endodontic therapy (chances of recurrence are high)

Question 12

when do residual cysts result?

Answer 12

if lesion is not removed

Question 13

preferred location of buccal bifurcation cyst

Answer 13

buccal aspect of mandibular first permanent molar

Question 14

predisposition to buccal bifurcation cyst

Answer 14

teeth with enamel extensions into the furcation fo rotos

Question 15

clinical features of buccal bifurcation cyst?

Answer 15

-age 5-13
-buccal tenderness, swelling, foul-tasting discharge
-1/3rd cases bilateral

Question 16

radiographic features of buccal bifurcation cyst

Answer 16

1. well circumscribed lucency <2.5cm
2. occlusal view most characteristic (lingual tilt)

Question 17

treatment of buccal bifurcation cyst

Answer 17

enucleation
extraciton unnecessary

Question 18

relationship with tooth for dentigerous cyst

Answer 18

forms around the crown of an impacted tooth

must have impacted teeth for diagnoses

Question 19

where dentigerous cyst forms

Answer 19

1. arises from reduced enamel epithelium
2. always attached to cervical margin of impacted tooth
3. displaces inferior dental canal

Question 20

most affected tooth by dentigerous cyst

Answer 20

mand 3rd molar region and max canine region

Question 21

how dentigerous cysts affect location of tooth

Answer 21

displace inferior dental canal

Question 22

what should you do when you find a dentigerous cyst?

Answer 22

should be submitted for histopathological confirmation

Question 23

other lesions that may arise in a dentigerous relationship of tooth

Answer 23

odontogenic keratocyst
central mucoepidermoid carcinoma
ameloblastoma

Question 24

eruption cyst

Answer 24

cyst that forms in soft tissue overlying crown of an erupting tooth

Question 25

treatment of eruption cyst

Answer 25

-cyst usually ruptures spontaneously -tooth erupts -if eruption is impeded, a simpel excision of the roof ot he cyst perimits speedy tooth eruption

Question 26

clinical features of odontogenic keratocyst

Answer 26

-locally aggressive cyst -mostly mandible -bone expansion is late feature -multiple teeth involved -multilocular appearance develops as lesion -may reach large size before discovery

Question 27

histopathological features of odontogenic keratocyst

Answer 27

-uniform, thin stratified squamous epithelial lining -palisaded appearance -tall, columnar basal cells -no rete pegs

Question 28

rate of recurrence of odontogenic keratocyst

Answer 28

high! (difficult to remove because of numerous satellite / daughter cysts)

Question 29

syndrome that shows presence of multiple OKCs in jaw bone

Answer 29

gorlin syndrome

Question 30

gene mutated in OKC

Answer 30

PTCH gene

Question 31

orthokeratinized odontogenic cyst VS OKC

Answer 31

epithelial lining is orthokeratinized vs parakeratinized

Question 32

gingival cyst of newborn is derived from

Answer 32

dental lamina rests

Question 33

gingival cyst of newborn

Answer 33

1-2mm whitish papules on alveolar ridge mucosa in newborns (maxilla)

Question 34

treatment of gingival cyst of newborn

Answer 34

no treatment needed

Question 35

contents of gingival cyst

Answer 35

keratin debris in lumen

Question 36

source of epithelial lining in gingival cyst of adults

Answer 36

dental lamina rests

Question 37

demographics of gingival cyst of adults

Answer 37

middle aged adults (50-60s)

Question 38

location of gingival cyst of adults

Answer 38

mandibular canine / premolar region most common

Question 39

clinical features of gingival cyst of adults

Answer 39

-painless, bluish translucent swelling -often centered in attached gingiva -usually less than 5mm

Question 40

intra bony counterpart of gingival cyst of adults

Answer 40

lateral periodontal cyst (sits on bone instead of soft tissue)

Question 41

botryoid odontogenic cyst

Answer 41

multilocular variant of lateral periodontal cyst

Question 42

how botryoid odontogenic cyst impacts rate of recurrence

Answer 42

teeth are preserved slight recurrence potential

Question 43

clinical features of glandular odontogenic cyst

Answer 43

-1cm -small cysts are asymptomatic -large cysts are expansile (may have pain or paresthesia) -unilocular or multilocular radiolucency

Question 44

microscopic features of glandular odontogenic cyst

Answer 44

intraepithelial microcysts filled with eosinophilic material, cilia, and mucocytes

Question 45

treatment options for glandular odontogenic cyst

Answer 45

enucleation and thorough curette (small) or en bloc resection (large)

Question 46

rate of recurrence of glandular odontogenic cyst

Answer 46

tendency to recur (up to 30%)