183869.fig.001a
(a)
183869.fig.001b
(b)
183869.fig.001c
(c)
183869.fig.001d
(d)
183869.fig.001e
(e)
Figure 1: Axial CT scans of bilateral permanent three-rooted mandibular first molars. (a) Coronal section, (b) pulp-chamber section, (c) coronal-third root section, (d) mid-root section, and (e) apical-third root section. Arrows indicate bilateral extra DL roots.