Odontomas are the most common odontogenic tumours. They are the malformations of dental tissues and may interfere with the eruption of tooth. Morphologically odontomas can be classified as complex, when present as irregular masses containing different types of dental tissues, or as compound if there is superficial anatomic similarity to even rudimentary teeth – the denticles. Odontomas are non-aggressive, usually asymptomatic, remain small and often discovered during routine radiography in the first two decades of life, with a mean age at the time of diagnosis is 14 years. Occasionally it does become large and may produce expansion of bone with consequent facial asymmetry. Complex odontomas are less frequently found as compared to the compound odontomas in the ratio 1:2 and they are considered to be hamartomatous malformations rather than true neoplasms.
Here we report a case of complex composite odontoma in the right posterior mandible of an 8 year old boy causing dislocation of the erupting tooth in that area.

Keywords: Complex odontoma; Hamartomatous; Mandible.