The device has a reference-image producing device producing a reference-design of a denture in a reference-condition based on actual design and manipulated image data. An image-manipulation device has a segmenting device for segmenting tooth and/or denture parts in the actual design in dependent of a pre-determined denture-and/or tooth treatment function, where the actual design is produced by an actual-image producing device (2). A segment manipulator automatically manipulates the segmented image section in dependent upon the pre-determined tooth treatment function.
