[Dens invaginatus--a challenge in endodontics].

Dens invaginatus is a malformation of teeth probably due to infolding of the dental papilla during tooth development. A wide range of morphologic variations have been described. Both coronal and radicular invaginations have been demonstrated. Typical characteristics associated with the coronal invagination are the complex anatomy and the early pulp necrosis. The etiology, epidemiology, classification and therapeutic considerations are reviewed.