Figure 1 Tooth mineralization stages according to Demirjian et al. (1973). Stage A: Calcification of the occlusal surface occurs without fusion; Stage B: Formation of occlusal surface by fusion of the mineralization points; Stage C: Enamel is formed and the formation of dentin has started, with no pulp horns in the pulp chamber; Stage D: Crown is formed up to the cement–enamel junction, with commencement of root formation; Stage E: The roots are shorter than the crown height and the radicular bifurcation is calcified; Stage F: The roots are equal or longer than the crown height; Stage G: The walls of the root canal are parallel, with the apical ends open; Stage H: The apexes of the roots are closed.