Abstract
Introduction: The aim of this study was to demonstrate that the simulation surgery on rapid prototype (RP) model, which is based on the 3-dim ensional computed tomography (3D CT) data taken before surgery, has the same accuracy as traditional orthograthic surgery with an intermediate splint, using an optoelectronic tracking navigation system. Materials and Methods: Simulation surgery with the same treatment plan as the Le Fort I osteotomy on the patient was done on a RP model based on the 3D CT data of 12 patients who had undergone a Le Fort I osteotomy in the department of oral and maxillofacial surgery, S eoul National University Dental Hospital. The 12 distances between 4 points on the skull, such as both infraorbital foramen and both supraorb ital foramen, and 3 points on maxilla, such as the contact point of both maxillary central incisors and mesiobuccal cuspal tip of both maxillary fi rst molars, were tracked using an optoelectronic tracking navigation system. The distances before surgery were compared to evaluate the accuracy of the RP model and the distance changes of 3D CT image after surgery were compared with those of the RP model after simulation surgery. Results: A paired t-test revealed a significant difference between the distances in the 3D CT image and RP model before surgery.( P<0.0001) On the other hand, Pearson's correlation coefficient, 0.995, revealed a significant positive correlation between the distances.( P<0.0001) There was a significant difference between the change in the distance of the 3D CT image and RP model in before and after surgery.( P<0.05) The Pearson's correlation coefficient was 0.13844, indicating positive correlation.( P<0.1) Conclusion: Theses results suggest that the simulation surgery of a Le Fort I osteotomy using an optoelectronic tracking navigation system is relatively accurate in comparing the pre-, and post-operative 3D CT data. Furthermore, the application of an optoelectronic trackin g navigation system may be a predictable and efficient method in Le Fort I orthognathic surgery.
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