Fig. 4.

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 (blue) and radicular template (yellow) and T1 tooth model 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