the like the files can be run together for forming desired shapes so called 34 unions 34 on the visual display unit by means of which unions options are provided on the screen for the formation of simultaneous graphic representations read data can here be attributable to inner surfaces outer surfaces and the like also bodies and shapes can be formulated for free merging on the screen 34 morphing 34 as it is known the files can thereby be merged and different parts of the contours mutually exchanged this process enables an inner surface file and read wax hood file for example to be merged and tied to a macro model the manual work which is input in this way can be automatically processed which provides accuracy in difficult preparation cases shapes high accuracy of fit can be obtained and the work can be maintained by virtue of the computer control managed by a dental technician the dental technician dentist is therefore able in the case involving macro models to select desired macro models from the library and attach these to graphic representations of shell or sleeve profiles which are formulated on the computer screen the dental technician dentist is also able.