Last revised by Andrea Molinari on 04 Jun 2022

Odontomas are one of the most common mandibular lesions encountered and the most common odontogenic tumors of the mandible. They account for up to two-thirds of all such tumors; the next most common are ameloblastomas, making up the majority of the remaining one-third.

They can occur at any age, although typically are diagnosed in the 2nd decade of life.

They can be thought of as a 'tooth hamartoma', with the lesion consisting of various tooth components (dentin, cementum, pulpal tissue, and enamel). They are divided histologically into:

Approximately half will be associated with an unerupted tooth, the rest being diagnosed both before or after tooth eruption.

Odontomas are one of the features of Gardner syndrome 5.

Initially, the tumor is lucent, but with time, it develops small calcifications which eventually coalesce to form a radiodense lesion with a lucent rim.

Epithelial components may occasionally give rise to a dentigerous cyst.

Surgical resection is the treatment of choice and there is no recurrence.

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Cases and figures

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