- 1. A tumor of odontogenic origin. 2. A hamartomatous odontogenic tumor composed of enamel, dentin, cementum, and pulp tissue that may or may not be arranged in the form of a tooth. [odonto- + G. -oma, tumor]- ameloblastic o. a benign mixed odontogenic tumor composed of an undifferentiated component histologically identical to an ameloblastoma and a well-differentiated component identical to an o.; appears as a mixed radiolucent-radiopaque lesion and presents clinically as an ameloblastoma. SYN: odontoameloblastoma.- complex o. an o. in which the various odontogenic tissues are organized in a haphazard arrangement with no resemblance to teeth.
* * *odon·to·ma (.)ō-.dän-'tō-mə n, pl -mas also -ma·ta -mət-ə a tumor originating from a tooth and containing dental tissue (as enamel, dentin, or cementum)
* * *n.an abnormal mass of calcified dental tissue, which usually represents a developmental abnormality. Compare hamartoma.
* * *odon·to·ma (o-don-toґmə) [odont- + -oma] 1. odontogenic tumor. 2. a specific type of mixed odontogenic tumor, in which both the epithelial and mesenchymal cells exhibit complete differentiation, resulting in formation of tooth structures.
Medical dictionary. 2011.