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Congenital absence of the teeth; developmental, not due to extraction or impaction.

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A congenital or acquired condition of having fewer than the normal complement of teeth.

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A condition characterized by the presence of supernumerary teeth.

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Abnormal increase in size of one or more teeth.

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Abnormal smallness of the teeth.

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A developmental anomaly involving molar teeth in which the bifurcation or trifurcation of the roots is very near theapex, resulting in an abnormally large and long pulp chamber with exceedingly short pulp canals.

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Distortion of the root and crown from their normally linear relationship.

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Distortion of the root portion only - bends must be sharp.

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The union of the roots of two adjacent teeth by cementum.

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Two separated root segments caused by a disturbance during root development.

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Normal sized crowns have abnormally short roots.

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A union of two adjacent tooth buds; the two portions are always united through the enamel and dentin and occasionally even the pulp.

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The "twinning" of a single tooth bud. Geminated teeth usually have a single common root, a common pulp canal, and visible partial cleavage of the enamel crown.

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Excessive deposition of secondary cementum on the root of a tooth, which may be caused by localized trauma or inflammation, excessive tooth eruption, or Paget's disease of the bone, or may occur idiopathically.

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Extra cusps, or tubercles, most often found in molars or as incisal extensions of the cingulum in maxillary anteriors.

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Extra roots found on teeth which undergo root development after birth.

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A developmental anomaly in which there is a small nodule of enamel below the cementoenamel junction, usually at the bifurcation of molar teeth.

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The teeth of congenital syphilis in which the incisal edge is notched and narrower than the cervical area.

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A developmental disturbance in tooth formation resulting from invagination of the epithelium associated with crown development into the area destined to become pulp space; after calcification there is an invagination of enamel and dentin into the pulp space, giving the radiographic appearance of a "tooth within a tooth."

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An odontoma in which the various odontogenic tissues are organized in a haphazard arrangement with noresemblance to teeth.

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A developmental disturbance of teeth characterized by deficient or defective enamel matrix formation; may be hereditary, as in amelogenesis imperfecta, or acquired, as encountered in dental fluorosis, local infection, childhood fevers, and congenital syphilis.

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A defect of enamel maturation, characterized by soft opaque or yellowish white lusterless enamel.

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A hereditary disease in which there is imperfect formation of enamel, resulting in brownish coloration and crumbling of the teeth.

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Hypomineralization of tooth enamel caused by ingestion of excessive fluoride during enamel formation - also termed mottled enamel.

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Incomplete development of enamel seen as a localized discolored spot or deformed area on a tooth.

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Enamel hypoplasia involving a solitary permanent tooth; related to infection in the primary tooth that preceded it or to trauma during odontogenesis.

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Intrinsic color change to the dentin of teeth undergoing mineralization due to the administration of wide-spectrum antibiotic tetracyclines either to a mother during certain prenatal periods, or to the infant.

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Genetic disturbance of dentin formation; crown of the tooth exhibits an unesthetic clinical appearance of opalescence, which is bluish-brown in color (opalescent dentin)

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An odontoma in which the odontogenic tissues are organized and resemble anomalous teeth.

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Abnormal Numbers

Anodontia

Hypodontia

Hyperdontia

Abnormal Size

Macrodontia

Microdontia

Abnormal Shape

Taurodontism

Dilaceration

Flexion

Concrescence

Segmented Root

Dwarfed Roots

Fusion

Gemination

Hypercementosis

Accessory Cusps

Accessory Roots

Enamel Pearls

Hutchinson's Teeth

Dens in Dente

Complex Odontoma

Compound Odontoma

Abnormal Calcification and Apposition

Enamel Hypoplasia

Enamel Hypocalcification

Amelogenesis Imperfecta

Dental Fluorosis

Focal Hypomaturation

Turner's Teeth

Tetracycline Staining

Dentinogenesis Imperfecta