Dentigerous cyst

Case contributed by A/Prof Sergio Uribe

Presentation

Male, 16 years old, in orthodontic treatment. OPG radiograph taken for third molar control.

Patient Data

Age: 16
Gender: Male
X-ray

Control of teeth 17 (4.8) and 32 (3.8). Tooth 17 in development, Nolla stage 6, horizontal position, mesioangulated, with unilocular, well defined radiolucency with radiopaque border. 

A cone-beam CT examination was ordered later to evaluate the radiolucent area below teeth 17 (4.8).

CT

Tooth 17 in development, Nolla stage 6, horizontal position, mesioangulated, with unilocular, well defined radiolucency with radiopaque border. 

Case Discussion

Dentigerous cyst comprise 14-20% of all jaw cysts, more frequent in males and in mandibular area. 

The lesion is attached to the cervical area of an impacted, retained or in development tooth and results from the reduced enamel epithelium proliferation after enamel formation. 

Differential diagnosis includes odontogenic keratocyst, ameloblastoma, ameloblastic fibroma and adenomatoid odontogenic tumor. 

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