What primarily causes concrescence?

Concrescence is primarily caused by the fusion of the roots of two adjacent teeth due to the presence of cementum over the roots. Crowding or trauma can lead to this condition as they may cause the roots of neighboring teeth to become closely apposed or even touch, resulting in a physical process that encourages their cementum to adhere together. In situations where there is insufficient space for proper alignment, or traumatic incidents that disrupt normal teeth positioning, the risk of concrescence increases.

Other factors such as infection may impact periodontal health but are not the primary cause of concrescence. Genetic factors, while they can influence a variety of dental conditions, do not specifically lead to this fusion. Age-related changes also influence dental structures, yet they do not directly cause concrescence in the way that crowding or trauma can. Therefore, the condition of concrescence is most directly associated with physical interactions between teeth, particularly due to crowding or trauma.