The technology relates to modelling a prepared tooth for fitting a prosthetic thereon. A die, representative of a prepared tooth, may be modelled as a positive virtual three-dimensional die model. An impression of a set of teeth surrounding and including the prepared tooth may be modelled as a negative virtual three-dimensional impression model. The negative virtual three-dimensional impression may be inverted to create a positive virtual three-dimensional impression model. The positive virtual three-dimensional impression model and the positive virtual three-dimensional die model may then be merged to create a virtual three-dimensional dentition model.
