The invention relates to a working model to perform a dental prosthesis for a tooth stump, comprising a model mandible with teeth made from resin by means of 3D printing and a detachable model tooth stump. The model tooth stump comprises a main body made from resin by means of 3D printing and a rigid insert introduced in a housing formed in said main body. First fixing means comprised in the rigid insert cooperate with second fixing means, passing through the through holes made in the model mandible with teeth, for integrally attaching the model tooth stump to the model mandible with teeth in a detachable manner.

Disclosed is a method for replacing first three-dimensional digital tooth models by second three-dimensional digital tooth models. The method comprises receiving a three-dimensional digital anatomic model of an oral anatomic structure of a patient and the first three-dimensional digital tooth models arranged with respect to the three-dimensional digital anatomic model at tooth positions with tooth orientations. The first three-dimensional digital tooth models comprise first identifiers identifying the dental key structures. First three-dimensional digital tooth models are selected for a replacement. The selected first three-dimensional digital tooth models are replaced by the second three-dimensional digital tooth models.