Fig. 2.

Dental crown growth parameters. (A) Postnatal crown formation time in days from birth for the four investigated fossil deciduous teeth relative to the range of variability reported in literature for modern and archaeological individuals (red, blue, green lines). (B) Box plot of the daily secretion rate (DSR) variation in the first 100 µm from the enamel–dentine junction (min., second quartile, median, third quartile, max.) in comparison to the corresponding variability (min., mean, max.) of modern humans (MH), reassessed from refs. 27–30. (C) Box plot of the daily secretion rate variation across the whole crown (min., second quartile, median, third quartile, max.) and range of variation (min., mean, max.) of modern humans (MH), reassessed from refs. 27–30. Ldm1, lower deciduous first molar; Ldm2, lower deciduous second molar; Udc, upper deciduous canine; Ldi2, lower deciduous later incisor.