Patients with skeletal malocclusion often show functional TMJ - disorders, which frequently are due to the imbalance of the stomatognathic system. Therefore in orthognatic surgery it is mandatory to reestablish a biomechanic equilibrium by harmonizing the profil under the esthetic point of view at the same time. Developing a three-dimensional double splint method together with a new designed repositioning device a controlled three-dimensional repositioning of the mandible and maxilla will be achieved. Using this model-repositioning device the mantainmence of a centric position of the condyles is prevailed intraoperativly and allows a three-dimensional predictable and reproduceable three-dimensional positioning of the osteotomized jaw segments in orthognathic surgery. The first part of this article describes the technical details for the splint fabrication and the in second part clinical cases and the surgical outcome will be outlined. Schlagwörter: Orthognathe Chirurgie, Kiefergelenkfunktion, 3D Positionierung