The purpose of this study was to simulate postoperative radiographs by preoperative radiographs using a personal computer. METHOD: Preoperative radiograph was scanned by image scanner and full color frame memory, and simulations of the osteotomies were carried out using a personal computer. RESULT: The quality of the pictures on the computer display was equal to the plane radiograph. More intensive calculation of the osteotomy was possible with our method than with a diagram method using the tracing paper. Furthermore, the pictures could be saved on the floppy disk.
