Bone-like tissue growth in the root canal of immature permanent teeth after traumatic injuries

Following a severe traumatic incident to permanent immature teeth, the grow th of calcified tissue in the pulp space may occasionally occur. This calci fied tissue may he diffuse or in intimate contact with the dentine. It has been suggested that a wide open apex, severe damage to the root sheath, and the absence of infection are only some of the predisposing factors leading to this metaplasia of pulp tissue into bone-like tissue. Five cases are de scribed.