| odontoameloblastoma | <tumour> A benign mixed odontogenic tumour comprised of an undifferentiated component histologically identical to an ameloblastoma and a well differentiated component identical to an odontoma; appears as a mixed radiolucent-radiopaque lesion and presents clinically as an ameloblastoma. Synonym: odontoameloblastoma. (05 Mar 2000) |
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| odontoblast | Columnar cells derived from the dental papilla after ameloblasts have differentiated and that give rise to the dentine matrix that underlies the enamel of a tooth. (18 Nov 1997) |
| odontoblastic layer | A layer of connective tissue cells at the periphery of the dental pulp of the tooth. (05 Mar 2000) |
| odontoblastic process | The extension of the odontoblast which lies within the dentinal tubule; application of stimuli to dentin may cause aspiration of odontoblast contents into the process. (05 Mar 2000) |
| odontoblastoma | <tumour> 1. A tumour composed of neoplastic epithelial and mesenchymal cells that may differentiate into cells able to produce calcified tooth substances. 2. An odontoma in its early formative stage. Origin: odontoblast + G. -oma, tumour (05 Mar 2000) |
| odontocete | <zoology> A subdivision of Cetacea, including the sperm whale, dolphins, etc.; the toothed whales. Origin: NL, from Gr, a tooth + a whale. Source: Websters Dictionary (01 Mar 1998) |
| odontoclast | One of the cells believed to produce resorption of the roots of the deciduous teeth. Origin: odonto-+ G. Klastos, broken (05 Mar 2000) |
| odontodynia | Synonym: toothache. Origin: odonto-+ G. Odyne, pain (05 Mar 2000) |
| odontodysplasia | A localised arrested tooth development which appears to involve most commonly the anterior teeth, usually on one side of the midline, most often the maxillary central and lateral incisors. Roentgenographically, the teeth have a ghostlike appearance. Calcification and bits of prismatic enamel may be found in the pulp and the enamel is thin and absent in part. (12 Dec 1998) |
| odontogenesis | The process of development of the teeth. Synonym: odontogeny, odontosis. Origin: odonto-+ G. Genesis, production (05 Mar 2000) |
| odontogenesis imperfecta | A localised arrested tooth development which appears to involve most commonly the anterior teeth, usually on one side of the midline, most often the maxillary central and lateral incisors. Roentgenographically, the teeth have a ghostlike appearance. Calcification and bits of prismatic enamel may be found in the pulp and the enamel is thin and absent in part. (12 Dec 1998) |
| odontogenic cyst | A cyst derived from odontogenic epithelium. Origin: odont-+ G. Genos, birth, origin, + suffix -ic, pertaining to (05 Mar 2000) |
| odontogenic cyst, calcifying | A mixed radiolucent-radiopaque lesion of the jaws with features of both a cyst and a solid neoplasm. It is characterised microscopically by an epithelial lining showing a palisaded layer of columnar basal cells, presence of ghost cell keratinization, dentinoid, and calcification. (12 Dec 1998) |
| odontogenic cysts | Cysts found in the jaws and arising from epithelium involved in tooth formation. They include follicular cysts (e.g., primordial cyst, dentigerous cyst, multilocular cyst), lateral periodontal cysts, and radicular cysts. They may become keratinised (odontogenic keratocysts). Follicular cysts may give rise to ameloblastomas and, in rare cases, undergo malignant transformation. (12 Dec 1998) |
| odontogenic dysplasia | A localised arrested tooth development which appears to involve most commonly the anterior teeth, usually on one side of the midline, most often the maxillary central and lateral incisors. Roentgenographically, the teeth have a ghostlike appearance. Calcification and bits of prismatic enamel may be found in the pulp and the enamel is thin and absent in part. (12 Dec 1998) |