Customized bone replacement structures offer the potential to build up missing bone areas. However, additive manufacturing of calcium phosphate cement (CPC) structures is limited due to the material behavior. The aim is to separate the functionalization and shaping. Thus, prefabricated CPC-prefabs, which show different porosity as functionalization, are to be manufactured additively. The individual shaping will be carried out by milling (CAD/CAM). Several CPC-prefabs are developed, which differ in the mapping of the transition geometry from porous to dense phase as well as in the overall size. Therefore, categorized datasets of mandibular scans are analyzed and the cross-sectional contour of the bone is determined. Mathematical regression is used to determine a parametrically described average contour, which is used to design the prefab models. First single phase prefab demonstrators have been additively manufactured and subjected to initial milling tests. The feasibility in principle of the intended process has thus been demonstrated.