FIGURE 1.
(A) Diagrammatic representation of ankylosis with external replacement resorption (reproduced with permission from Fuss et al. 21 ). (B) Radiographically, ankylosis is recognized by the lack of lamina dura and PDL while external replacement resorption is characterized by loos of tooth structure which is replaced by bone. This radiograph demonstrates a case of extensive ankylosis and replacement resorption of tooth 21 18 months after the tooth had been avulsed, kept dry for 2 h and then replanted