Fig. 5

Registration of T0-T1 3D tooth models, and crown removal from 3D models. a Preliminary point-based superimposition, by selecting five random points on the buccal, palatal/lingual, mesial approximal, distal approximal, and occlusal aspects of the two models of the same tooth; (b) global registration using best-fit algorithm; (c) T0 tooth model (light blue) and radicular template (red) and T1 tooth model (yellow) in the same spatial orientation after superimposition; (d,e) definition of a single plane cut by randomly selecting three points on the lower surface of the T0 radicular template; (f) generation of the final T0 and T1 radicular models