X-ray shows single or multiple radio-opaque shadows which can be mistaken for foreign body, calcified lymph node, unerupted tooth
, calcified stylohyoid ligament or prominent tuber of maxilla or elongated styloid process.
About 70% of the unerupted tooth
have been reported to erupt spontaneously after removal of obstruction.
Most of the pathologies associated with impacted mandibular molars are cysts and tumours and the most common cyst were Dentigerous cysts .A Dentigerous cyst is a developmental Odontogenic cyst derived from the reduced enamel epithelium of the tooth forming organ and associated with the crown of an unerupted tooth
.Histologically the Dentigerous cyst is lined by non-keratinized stratified squamous epithelium and the cavity is filled by fluid or semisolid contents.
A characteristic feature of a dentigerous cyst is its appearance: The cyst typically surrounds the crown of an unerupted tooth
, expands thefollicle, and is attached to the cemento-enamel junction of the unerupted tooth
Dentigerous cyst is known to be caused by the accumulation of fluid between the epithelium and the crown of an unerupted tooth
. Its size increases by the expansion of the follicle, and it is attached to the neck of the tooth.
A dentigerous cyst is a development cyst that surrounds and envelops the crown of an unerupted tooth
, attached at the crown-root (cemento-enamel or cervical) junction.
The radiographic findings of KOT were in agreement with those described by Neville (2009) of a "radiolucent area, with sclerotic margins that were frequently well defined, with larger lesions possibly being shown to be multiloculated, and an unerupted tooth
being involved in the lesion in 25 to 40% of the cases".
Dentigerous cyst (DC) is an epithelial-lined developmental cavity that encloses the crown of an unerupted tooth
at the cementoenamel junction.
The most common type (73%) is the follicular type where there is a well-defined unilocular radiolucency surrounding an unerupted tooth
crown; radiographically identical to a dentigerous cyst (Figure 6).
Intraorally a small swelling shaped like an unerupted tooth
was visible on right retromolar region in contact with the distal surface of the first molar where the second and third molars were missing.
In 25% to 40% of the cases there is association of an unerupted tooth
in the lesion .
Patients present with swelling, unerupted tooth
, rapid destruction, and cortical plate expansion.