File:Lophosteus superbus tooth cushions 10.jpg

English: Oblique external-lateral close-ups of tooth addition and cyclic resorption of the four youngest tooth sites of two alternate files in tooth cushion GIT 760-3. (a) The first-generation teeth had undergone semi-basal resorption before the next addition, and the pulp cavities of new teeth join the old ones by crossing the dentine rings. (b–d) Successive replacement teeth are shed by basal resorption, leaving resorption surfaces stacked on top of the first-generation tooth remnants. (e) The rest of the vascular system, including the large canals of the basal bone, the radial vessels of the pulp cavities and the pulp cavities of the function teeth are shown. (f ) The dentine crowns of the functional teeth are shown. (g) The surrounding bone and vascular surface are shown. (h) The lateral view of the canal system of two neighbouring tooth sites in one tooth file. Arrow, the connections between the first-generation pulp cavities above the dentine rings. Arrow head, encroached structures by later resorption events. Arrow head with black outline, resorption events that affect the structures indicated by white arrow heads in the previous figures. Lingual to the right. Scale bars, 0.1 mm, (a–f ) are to the same scale.