Fig 3. 3D rendering of the unerupted LLC of MLD2 showing perikymata.

The unerupted MLD 2 LLC in its alveolar crypt, which filled with matrix during fossilization. Retzius lines could not be revealed in the virtual histological data, in spite of changing thickness and orientation of the virtual 2D slice, the two thick lines are likely parts of ring artifacts (A). Despite continuous contact between the OES and the sediment filling the crypt, and the noisy nature of the fringes at the OES, the enamel surface could be successfully segmented and rendered (B), revealing countable perikymata almost all the way from the cusp tip to the cervix. Linear enamel hypoplasias are also apparent encircling the tooth crown. File name: Figure_3.tif.