The planning of complex surgical procedures necessitates highly reliable computerized models of the human anatomy. The ultimate goal is to accurately simulate surgical interventions on virtual patient models in view of better preparation, improved surgical outcome, and shorter operation time. Due to the expanding application of computer technology in medicine new methods are evolving for medical diagnosis, education and training, as well as of surgical treatment planning, assistance and assessment. This project is aiming at improvement of facial surgery providing computer-assisted and model-guided therapy planning concepts.