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Overview of the simulation surgeries with the 3D-printed sinus models. (A) The setup of the simulation surgeries. (B) The 3D sinus models and its basement. (C) The models were inserted into and hold in the basement which mimics a human face. (D) The 3D models can be mass produced. (E) Endoscopic view of 3D-printed sinuses during the simulation surgeries.
