![]() ![]() The main underlying goal was to determine the stress distributions and deformations in the surgical instrument (osteotome) used, so as to predict the wear status of the instrument. Due to this lack in literature, the main motivation of this study was to establish a FEA-based methodology so as to simulate the lateral nasal osteotomy surgical procedure. ![]() Nevertheless, the lateral nasal osteotomy which constitutes a key step in almost all surgical procedures in rhinoplasty, has not been simulated yet by FEA methodologies. Based on the developed methodology, a preventive replacement of the osteotome before its extensive fracture can be determined, thereby minimizing the risk of postoperative complications. The proposed methodology allowed an accurate prediction of the critical number of impacts that the osteotome can receive during the lateral nasal osteotomy which is followed in all rhinoplasties. The developed von Mises stresses in both the osteotome and nasal bone were depicted. The wear of a new osteotome and an already used osteotome was also calculated and compared. ![]() In both cases examined, depiction of fracture patterns for the osteotome and the nasal bone were obtained. The actual nasal bone geometry used in the FEA model was obtained from a high-resolution, maxillofacial, computed tomography (CT) scan of a single patient. For the simulation of the surgical procedure, two scenarios were examined: (i) when utilizing a brand new osteotome and (ii) when utilizing an already used osteotome characterized by decreased fatigue strength. ![]() The latter parameter was determined by appropriate FEM-evaluation of the perpendicular impact test results. A FEA-based methodology was developed in order to predict the wear status of an osteotome (surgical instrument) during its use in a lateral nasal bone osteotomy considering its fatigue strength. ![]()
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