Abstract: Objective To assess the effect of three-dimensional(3D)technology in the reconstruction of orbital walls defects in malignant tumor of maxillary sinus. Methods A total of 6 patients suffering from malignant tumors of maxillary sinus with destruction of orbital walls who received surgical treatment in our department were enrolled. Before operation, all patients received computed tomography(CT). A resin stereo model of the affected orbital wall was printed with 3D printing technique, based on which a titanium mesh was modeled. The performed titanium mesh was then implanted into the defect area of orbital wall for reconstruction. Orbital volumes and globe projections were evaluated with clinical and CT examinations to assess the recovery of orbital walls. Results All 6 cases came through the operation successfully. During operation, the performed titanium mesh did not require reshaping and pruning. It fit bone bed surrounding the defect closely. Clinical and CT examinations 3 months after surgery showed successful reconstruction of orbital wall in all cases without serious complications. During the follow-up of 6 to 30 months, no recurrence occurred. Enophthalmos was corrected to less than 3mm. No clinical enophthalmos could be observed. Single quadrant diplopia occurred in one patient. The differences of orbital volumes and globe projections between the affected and unaffected orbits were both statistically insignificant(both P>0.05). Conclusion With exact reconstruction of anatomic shape and orbital volumes, 3D preformed titanium mesh is suitable for the repair of surgical orbital defect in sinus malignant tumor.

Key words: Preformed orbital titanium mesh, Sinus neoplasma, Bone defect of orbit, Three-dimensional technology