1. A method for manufacturing a combined model for use in planning, visualization and manufacturing of a dental component for a patient's set of teeth so that the patient and dental practitioner can see how the set of teeth will look after the dental component is installed, where the method comprises: obtaining a digital 3D representation of a pre-prepared set of teeth showing the region for which the dental component is intended; providing a 3D virtual model of the dental component showing a desired shape of the teeth of the dental component; generating a 3D virtual combined model expressing a target dental situation for the patient when the dental component is arranged at the teeth, where the generating comprises virtually replacing one or more teeth of the digital 3D representation of the pre-prepared set of teeth with the 3D virtual model of the dental component by virtually removing the one or more teeth of the digital 3D representation of the pre-prepared set of teeth and adding the 3D virtual model of the dental component to the digital 3D representation of the pre-prepared set of teeth; and manufacturing the combined model from the 3D virtual combined model.