Odontogenic cysts

Question 1

what is a cyst

Answer 1

pathological cavity having fluid or semi-fluid content

Question 2

what is a cyst lined by

Answer 2

wholly or part by epithelium

Question 3

2 main classifications of cysts of the jaws

Answer 3

Odontogenic
Non-odontogenic

Question 4

what does odontogenic mean

Answer 4

derived from epithelial residues of tooth forming organ

Question 5

what does non odontogenic mean

Answer 5

derived from sources other than tooth forming organ

Question 6

2 types of odontogenic cysts

Answer 6

inflammatory
developmental

Question 7

4 layers of enamel organ

Answer 7

inner enamel epithelium
outer enamel epithelium
stellate reticulum
stratum intermedium

Question 8

types of inflammatory odontogenic cysts

Answer 8

radicular cyst
inflammatory collateral cyst

Question 9

what is the most common type of jaw cyst

Answer 9

radicular cyst

Question 10

Clinical features of radicular cyst

Answer 10

• slow growing swelling
• often no symptoms
• must be associated with a non vital tooth
• typically well circumscribed unilocular radiolucent lesion seen at apex

Question 11

radicular cyst tx

Answer 11

• small cysts - rct/ xla/ periradicular surgery
• enucleation
• marsupialisation for large lesions

Question 12

types of radicular cysts

Answer 12

lateral radicular cyst
residual cyst

Question 13

what is a lateral radicular cyst

Answer 13

radicular cyst arising from a lateral root canal branch of a non vital tooth

Question 14

what is a residual cyst

Answer 14

radicular cyst that persists after extraction of the associated non vital tooth

Question 15

2 variants of inflammatory collateral cysts

Answer 15

• paradental cyst (lower 8s)
• mandibular buccal bifurcation cyst (lower 6s and 7s)

Question 16

inflammatory collateral cysts aetiology

Answer 16

inflammation associated with pericoronitis

Question 17

paradental cyst clinical features

Answer 17

• arise from chronic pericoronitis
• associated with vital tooth
• well demarcated radiolucency

Question 18

clinical features of mandibular buccal bifurcation cyst

Answer 18

• often painless swelling
• associated tooth usually tilted buccally with deep pocket
• well demarcated buccal radiolucency

Question 19

tx for paradental cyst and mandibular buccal bifurcation cyst

Answer 19

• enucleation
• removal of 8s and paradental cyst