Dentigerous cyst
A odontogenic cyst that surrounds the crown of impacted tooth. It is caused by fluid accumulation between reduced enamel epithelium and crown. Resulting a cyst in which crown is within lumen and roots are outside.
Clinical Feature
▪ It is usually associated with impacted canine or third molar.
▪ It is usually asymptomatic but sometime pain and inflammation is present.
▪ In arch the tooth appear to have missing one tooth.
Radiographic features
It is usually diagnosed by radiograph
▪ It appears well circumcised radiolucency sorrounding the impacted tooth.
▪ Radiolucency limited to cementoenamel junction.
▪ Sorrounding bone is corticated.
Histopathology
▪ Epithelium is non-keratinized stratified squamous epithelium.
▪ It is 2 to 10 cell layer thick.
▪ Inflammation can be present.
▪ It has rushton bodies.
▪ Cholesterol and hemosiderin deposit.
▪ Lipid laden macrophages.
▪ Cell layer may have mucous cells known as mucous cell mataplasia.
Importance
Since it has a malignant potential, so it can give rise to
▪ Mucoepidermoid carcimoma
▪ Ameloblastoma
▪ Squamous cell carcinoma
Eruption cyst
An odontogenic cyst with the histologic feature of a dentigerous cyst that sorrounds the tooth crown that has erupted through bone but not through soft tissue and is clinically visible as a soft fluctuant mass on the alveolar ridge.
▪ It does not form intrabony radioluency.
▪ Sometimes it ruptures forming erruption hematoma.
▪ It has variable number of ghosted cell present in cyst lumen.
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