Tooth Shape

Features

  • Fusion: Two teeth joined together from the fusion of two separate adjacent germs. The radiographic appearance is enlarged crown and root with two root canals.
  • Gemination: Two teeth arise from one tooth germ. The radiographic appearance is enlarged crown and root with one root canal.
    * As in some cases fusion and gemination cannot be distinguished, both conditions can be named connation.

  • Concrescence: The two adjacent teeth are attached at cementum.
  • Dens-in-dente (Dens Invaginatus): the outer surface of enamel is infolded in to the interior side.

Cases

Fusion and palatal bone loss.

Concrescence

Talon cusp.

Fusion upper molars with periapical lesion

Dens-in-dente (dens invaginatus) literally means “a tooth within a tooth”. It is a developmental anomaly. It is most frequently seen in maxillary lateral incisors.
Caries and pulp necrosis is frequent in these teeth.

Different cases of dens-in-dente (dens invaginatus)

Different cases of dilaceration. It refers to an angulation, or a sharp bend or curve, in the root or crown of a formed tooth.