Determination of crown formation times for the mandibular left canines of MLD2 and of StW151.

The number of perikymata used for calculating the formation time of the lateral enamel is the average of the three observers' means. The true crown formation time of the StW151 LLC will exceed our results since the crown is not fully formed. The lateral enamel formation time was determined from the perikymata counts on the 3D renderings combined with 2D virtual histological slice (for StW151), multiplied by the long period lines periodicity. The cuspal enamel formation time was determined from a linear measurement from the dentine horn tip to the enamel surface at the level of the first perikymata, multiplied by enamel daily secretion rates (see S1 Supporting Information [section III] and S3 Supporting Information).
Determination of crown formation times for the mandibular left canines of MLD2 and of StW151.