Fuente: Wipo "digitalization" A computer-implemented method/system/medium includes receiving a two dimensional (“2D”) digital image including at least a portion of a person's dentition; receiving a three dimensional (“3D”) digital surface model of the person's dentition; receiving one or more 3D digital surface model key points selected on the 3D digital surface model; receiving one or more corresponding 2D digital image key points selected on the 2D digital image; and fitting a camera model using the one or more 3D digital surface model key points and the one or more corresponding 2D digital image key points to align the 3D digital surface model with the 2D digital image.