# Which of the following compulsorily involves two teeth?
A. Dilaceration
B. Gemination
C. Taurodontism
D. Concrescence
The correct answer is D. Concrescence.
Concrescence of teeth is actually a form of fusion which occurs after root formation has been completed. In this condition, teeth are united by cementum only. It is thought to arise as a result of traumatic injury or crowding of teeth with resorption of the interdental bone so that the two roots are in approximate contact and become fused by the deposition of cementum between them. Concrescence may occur before or after the teeth have erupted, and although it usually involves only two teeth, there is at least one case on record of union of three teeth by cementum.
Reference: Shafer’s Textbook of ORAL PATHOLOGY, 7th Edition, Page No: 41
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