Cysts of the Jaw

Question 1

Cysts

Answer 1

Anywhere in mandible and maxilla, radiolucent.

Corticated or non-corticated

Circular (always in sinus) or oval

Question 2

Cysts effect on surrounding Structures

Answer 2

Displacement - teeth, roots, canal
Root resorption - directional due to pressure
Expansion - look at borders of mandible

Question 3

Odontogenic Cysts

Answer 3

Periapical
Residual
Lateral Periodontal
Buccal Bifurcation
Dentigerous Cyst
OKC, CEOC

Question 4

Non-Odontogenic Cysts

Answer 4

Nasopalatine
Nasolabial
Dermoid
Simple Bone
Aneurysmal Bone

Question 5

Radicular Cyst (periapical cyst)

Treated w/ Root Canal, apical surgey

Answer 5

Epithelial cells in PDL are stimulated by inflammatory process.

Nonvital teeth
Swelling
Asymptomatic possibly

Question 6

Radicular Cyst (periapical cyst) Radio Features

Answer 6

At apex of non-vital tooth

Corticated border

Radiolucent

May cause tooth displacement and resorption of root

Question 7

Residual Cyst

Answer 7

Cyst formed after incomplete removal of original cyst or removal of tooth, usually asymptomatic

Question 8

Residual Cyst Radio Features

Answer 8

Usually mandible

Periapical region of edentulous area

Corticated margin

Radiolucent

May cause tooth displacement/resorption

Question 9

Buccal Bifurcation Cyst (Inflammatory)

Currettage or no treatment

Answer 9

Usually first two decades of life.

No or delay of eruption of mandibular 1st or 2nd molar

Lingual cusp displaced occlusally, roots lingually

Question 10

Dentigerous Cyst (2nd most common after periapical cyst)

Surgical removement w/ w/o marsup

Answer 10

Forms around crown of unerupted tooth. More than 6 mm big

Swelling, facial asymmetry, missing teeth

Displaces structures a lot

Question 11

Dentigerous Cyst Radio Features

Answer 11

Usually mand third molar or max canine

Corticated radiolucent that may cause expansion and displace/resorb

Question 12

Lateral Periodontal Cyst

Answer 12

Arise from epithelial rests in periodontium lateral to vital tooth root

Asymptomatic and less than 1 cm

Well defined unilocular radiolucency

Question 13

Botryoid Odontogenic Cyst (BOC)

Answer 13

Multilocular lesion with bunches of grapes look to it.

A lateral periodontal cyst variety

Question 14

Nasopalatine Canal Cyst

Tx with enucleation

Answer 14

Incisive canal cyst
Arises from epithelial remnants of nasopalatine duct
Asymptomatic or may cause palatal swelling

Question 15

Nasopalatine Canal Cyst Radiographic Features

Answer 15

Typically between max central incisors
Well defined aand corticated
Circular/oval Radiolucent
May cause roots of central incisor to diverge or resorb

Question 16

Simple Bone Cyst

Probably due to not enough blood supply

Tx w/ currettage

Answer 16

Cavity in bone line w/ connective tissue - empty cavity

First two decades

Asymptomatic

Question 17

Simple Bone Cyst Radiographic Features

Answer 17

Usually posterior mandible

Well or ill-defined border

Scallops between roots - no displacement, usually unilocular

Bound well defined in alve processes

Question 18

Important Points

Radicular Cyst - 
Residual Cyst - 
Dentigerous Cyst -
BBC - 
Lateral Periodontal Cyst - 
Nasopalatine Duct Cyst -
SBC -

Answer 18

1. Apices of non-vital teeth
2. Missing teeth
3. RL crown of teeth
4. Buccal lucency molars, young patient
5. Lateral to teeth
6. Ant maxilla, midline
7. Posterior mandible, young patient