Cysts

Question 1

Radicular cysts come from the remenants of what epithelium

Answer 1

Rests of mallaez from hertwigs root sheath

Question 2

What two kinds of cysts come from remnants of the reduced enamel epithelium

Answer 2

Dentigerious cyst
Eruption cyst

Question 3

Ameloblastoma
Keratocyst
Gingival cyst

All come from remenants of which odontogenic epithelium

Answer 3

Dental lamina - rest of serres

Question 4

Radicular cysts make up what’s percentage of all odontogenic cysts

Answer 4

60%

Question 5

What is a radicular cyst commonly associated with

Answer 5

A non vital tooth

Question 6

How does a radicular cyst usually present Radiographically

Answer 6

Round or avoid radioluceny at root apex
Unilocular , well defined
Uniform radiolucency

Question 7

what are the two kinds of inflammatory collateral cysts

Answer 7

Paradental
Mandibular buccal bifurcation

Question 8

What kind of epithelium is seen in radiucular cyst

Answer 8

Lining of non keratinised squamous epithelium

Question 9

What is the most common type of developmental odontogenic cyst

Answer 9

Dentigerous cyst

Question 10

What is a characteristic feature of a Dentigerous cyst

Answer 10

Embrace all or part of the crown and attaches at the CEJ

Question 11

A Dentigerous cyst is lined by epithelium derived from what

Answer 11

Reduced enamel epithelium from the enamel organ

Question 12

What tooth is a Dentigerous cyst most commonly associated wuht

Answer 12

Impacted third molars

Question 13

What does an odontogenic keratocyst arise from

Answer 13

Cell rests of serres originating from dental lamina

Question 14

How does an odontogenic keratocyst expand and what does this mean

Answer 14

In an AP direction

Can reach a large size without causing gross bony expansion

Question 15

What syndrome is assoaciated with odontogenic keratocyst

Answer 15

Basal cell naevus syndrome

Multiple naeviod BCCs of skin

Question 16

What is the origin of nasopalatine duct cyst

Answer 16

Epithelial remnants of Naso-palatine duct

Question 17

What is a nasopalatine duct cyst lined with

Answer 17

Stratified squamous epithelium and respiratory or cuboidal epithelium

Question 18

What is cyst enucleation

Answer 18

Removal of the entire lining of the cyst and its contents
Depends on the size and cyst type

Question 19

Name 4 complications associated with cyst enucleation

Answer 19

Damage to IAN
Commutation with maxillary sinus - OAC
Pathological fracture of mandible
Risk of recurrence

Question 20

What is marsupilisation of a cyst

Answer 20

Creation of a surgical window in the wall of a cyst, removing the contents of the cyst and suturing the cyst wall to the surrounding epithelium

Encourages the cyst to decrease in size

Question 21

Name 4 complications associated with marsupilisation

Answer 21

Needs further surgery for removal of cyst
Long treatment before completion
Chance of re-infection
Uncomfortable for the patient

Question 22

What is a lateral periodontal cyst

Answer 22

Forms at the side of a tooth as a result of the opening of a lateral branch of a root canal

Occasionally can form as a result of inflammation in gingival pocket of a vital tooth

Question 23

How does continued growth happen in a radicular cyst

2 ways

Answer 23

Osmotic effect with semi-permeable wall
Cytokine mediated growth

Question 24

When sending a sample of a cyst to a lab what medium is it placed in

Answer 24

10% formalin

Question 25

What is the typical size of a dental follicle

Answer 25

<2.5mm

Question 26

Describe three histopathological features of an odontogenic keratocyst

Answer 26

Thin keratinsed epithelium No rete pegs Pallisading of basal cel nuceli

Question 27

When doing an aspiration biopsy of a Odontogenic keratocyst what would you expect the protein content to be

Answer 27

Low solubale protein content <4g/dl

Question 28

Why is inflammation in a cyst a problem for a pathologist?

Answer 28

Inflammed areas those their typical features leading to problems in diagnosis and surgical managment which could result in recurrence

Question 29

What is the importance of daughter cysts

Answer 29

The clincal importance of these cysts is that if they are left behind after surgical removal they can cause recurrence

Question 30

What is the normal width of an incisive papillae

Answer 30

6mm 3-6mm is the range

Question 31

What are 3 advantages of enucleation

Answer 31

Whole lining can be examined pathologically Primary closure Little aftercare needed

Question 32

What are 5 disadvantages of enucleation

Answer 32

Risk of a Mandibular fracture with a very large cyst Clot filled cavity may become infected With a Dentigerous cyst - ,may have wanted to preserve the tooth Incomplete removal of lining may cause recurrence Damage to adjacent structures

Question 33

What are two advantages of marsupialisation

Answer 33

Simple to perform May spare vital structures

Question 34

4 disadvantages of marsupialisation

Answer 34

Opening may close and cystreforms Complete lining isn’t available for histopatholgy Difficult to keep clean and a lot of aftercare needed Long time to fill in

Question 35

Name 5 indications for marsupialisation over enucleation

Answer 35

If enucleation would damage surrounding structures ie. ID canal Difficult access to the aera May allow eruption of teeth i.e in a Dentigerous cyst Elderly or immunocompromised pateitns who are unable to withstand extensive surgery If enucleation would risk jaw fracture

Question 36

What is a stafne cavity

Answer 36

This is a depression in the bone that is often mistaken for a cyst Only occurs in the mandible and almost exclusively lingual

Question 37

Where is stafne cavity most commonly found

Answer 37

In the mandible Often in angle or posteior body and often inferior to IAn

Question 38

Patient presenting with salty taste in mouth what cyst may you think of

Answer 38

Nasopalatine duct cyst