Fusion of roots of adjacent teeth at the cementum is called concrescence and is primarily caused by dilaceration.Gemination is the deposition of excessive secondary cementum.

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Concrescence,fusion of the roots of adjacent teeth at the cementum,is thought to occur sometimes as a result of trauma.It is NOT caused by dilaceration.Gemination is an anomaly arising when a tooth attempts to divide itself or partially twin itself by splitting its tooth germ.Deposition of excess cementum is an anomaly called hypercementosis.

Fusion of Roots of Adjacent Teeth at the Cementum Is