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Double teeth are usually larger than normal teeth and have a groove/fold in the enamel on the labial surface that can extend further down the root. In tooth gemination, this groove often symmetrically divides the tooth in half. [6] Mader’s “two-tooth” rule can help distinguish between tooth fusion and gemination.
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.
Fused teeth tend to have separate pulp chambers and root canals, unlike in tooth gemination which tends to have a single pulp chamber and root canal.However, the degree of separation will depend on where & when the fusion occurred so the pulp chamber and/or root canal may be completely fused into one.
Gemination is represented in many writing systems by a doubled letter and is often perceived as a doubling of the consonant. [3] Some phonological theories use 'doubling' as a synonym for gemination, while others describe two distinct phenomena. [3] Consonant length is a distinctive feature in certain languages, such as Japanese.
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 ]
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