Abstract
Assuming that the cross-striations on enamel rods represent daily increments, the various incremental lines in dentine between selected pairs of tetracycline markers were identified and correlated with Retzius lines in the enamel, in order to obtain comparative information on the rate of dentine formation. The incremental lines described by Andresen (1898) and von Ebner (1906) are the same and are separated by approx. 20 μm. However, a regular series of lines approx. 4 μm apart were also found and considered to be due to a 24-h rhythm in organic matrix formation. A separate 12-h rhythm influencing mineralization was deduced by comparing the number of calcospherite striae with the 4 μm rhythmic change in fibre orientation of the matrix.
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