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ITALIAN JOURNAL OF MAXILLOFACIAL SURGERY
A Journal on Maxillofacial Surgery
Official Journal of the Italian Society of Maxillofacial Surgery
Rivista Italiana di Chirurgia Maxillo-Facciale 2003 December;14(3):127-30
Hard and soft tissues 3D virtual surgery simulation in orthognathic surgery
Marchetti B. 1, Bianchi A. 1, Bassi M. 2, Gori R. 3, Lamberti C. 4, Sarti A. 4
1 Unit of Maxillofacial and Plastic Surgery, S.Orsola-Malpighi Hospital, Bologna, Italy
2 Unit of Maxillofacial Surgery Bufalini Hospital, Cesena, Italy
3 CINECA, Casalecchio di Reno, Bologna, Italy
4 DEIS, Faculty of Engineering University of Bologna, Bologna, Italy
Aim. The goal of virtual surgery in maxillofacial surgery is to acquire, analyse and interact with data obtained from non invasive examinations (CT, MRI, Eco, Endo-scopy, Laser scanner, 3D photos, etc-etc) to create an artificial environment which allows realistic prediction for several kind of surgical procedures, new techniques and preview. The final goal of computer-based surgery simulation is to enable a surgeon to perform more precise and well defined surgery with deeper acknowledge of the clinical case and the technique which will be performed. Patient besides could eventually have a preview of the final result of the surgery to increase his acknowledge for the final informed consensus.
Methods. A group of 12 patients with dento-facial deformities underwent a study of computerized aesthetic prevision of the final result of orthognathic procedures. Simulation was based on hard and soft tissues 3D CT data acquired from the patient face some days before surgery.
Results. These data underwent tissue segmentation, classification and 3D reconstruction, input visualization, surgical planning and numerical simulation by an original and appropriate software, VISU®, specifically developed for this research. 3-6 months after surgery patients underwent a new hard and soft tissues 3D CT examination and a validation procedure was applied. Preope-rative, simulations by VISU® and postoperative hard and soft 3D CT data were compared.
Conclusion. System validation both for reliability (the ability to simulate correctly the surgery result on the facial appearance) and repeatability (the extent to which the surgeon is able during the surgery to reproduce exactly the surgical bony planning), relating to the interested region, carried out as 80%.