Cysts of the Jaw Flashcards
(15 cards)
Xrays for investigating cysts
PA
OPT
CBCT
Occlusal
Important radiographic features to assess when looking at cysts
Location
Shape
Margins (well defined/corticated)
Locularity
Multiplicity
Effect on surrounding anatomy
Inclusion of UE teeth
How are cysts classified (3)
Structure (epithelium vs non)
Origin (odontogenic vs non)
Pathogenesis (development vs inflammatory)
Classification of odontogenic cysts
Developmental:
Dentigerous, Eruption, OK, Lateral periodontal
Inflammatory:
Radicular, Residual, Inflammatory collateral cyst - Paradental/Buccal bifurcation
Classification of non odontogenic cysts
Developmental:
Nasopalatine duct cyst
Other:
Solitary bone cyst
Aneurysmal bone cyst (no epithelial lining)
Sources of epithelium for Odontogenic cysts
Rests of Malassez - Hertwigs Root Sheath
Rests of Serres - Remnants of dental lamina
REE - Remnants of enamel organ
What is the most common odontogenic cyst
Radicular cyst (60%)
Associated with non vital teeth
Signs/symptoms of cysts
Mobility
Pain
Sensitivity
Spacing
TTP
Numbness
Failed eruption
Features of residual cyst
When radicular cyst persists after XLa/RCT of tooth
Features of inflammatory collateral cysts
Buccal bifurcation - mandibular 6s
Paradental - 8d
Features of eruption cyst
Around PE tooth - children
Features of dentigerous cyst
Crown of UE8/3
Radiographic features of OK
Large radiolucency
Scalloped margins
Displacement of adjacent teeth
Characteristic expansion
25% multilocular
Huge risk of pathological fracture + recurrence
Thin friable lining
Difficulties of treating OK
Recurrence rate - follow up 10yrs
Thin friable lining - difficult of surgery
Tx options for removal of cysts
- Enucleation
- All cyst removed
- Small cysts
(Not for dentigerous cysts) - Marsupialisation
- Negative pressure allows cyst to shrink
- Enucleated at later date
