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Concrescence is an uncommon developmental condition of teeth where the cementum overlying the roots of at least two teeth fuse together without the involvement of dentin. [ 1 ] [ 2 ] Usually, two teeth are involved with the upper second and third molars being most commonly fused together. [ 3 ]
Tooth fusion occurs when at least the dentin of developing tooth germs fuse. When only the cementum (root portion) of teeth is fused, this is known as concrescence. [4] The exact cause of tooth fusion is unknown, but is the result of alterations in embryonic tooth development.
If the double tooth is counted as two teeth, and the number of teeth in the dental arch is normal, the double tooth is likely due to fusion. Radiographic. In tooth gemination, the pulp chambers and root canals tend to be joined, unlike in tooth fusion where they tend to be separate. However, the degree of separation will depend on the stage of ...
The fusion of two deciduous teeth. Gemination occurs when a developing tooth incompletely splits into the formation of two teeth. Fusion is the union of two adjacent teeth during development. Concrescence is the fusion of two separate teeth only in their cementum.
Tooth ankylosis refers to a fusion between a tooth and underlying bony support tissues. In some species, this is a normal process that occurs during the formation or maintenance of the dentition. [1] By contrast, in humans tooth ankylosis is pathological, whereby a fusion between alveolar bone and the cementum of a tooth occurs.
Taurodontism is defined as the enlargement of pulp chambers with the furcation area being displaced toward the apex of the root of a tooth. It cannot be diagnosed clinically and requires radiographic visualization since the crown of a taurodontic tooth appears normal and its distinguishing features are present below the alveolar margin.
Occasionally, additional teeth may also arise from developmental anomalies like fusion or gemination. Fusion occurs when two tooth buds fuse together, creating a single, larger tooth. Gemination involves the incomplete division of a single tooth bud into two teeth. In some cases, these anomalies may take the form of the appearance of extra teeth.
Enamel hypoplasia is a defect of the teeth in which the enamel is deficient in quantity, [1] caused by defective enamel matrix formation during enamel development, as a result of inherited and acquired systemic condition(s).