Computer-Aided Design and 3D Printing to Produce a Costal Cartilage Model for Simulation of Auricular Reconstruction.

Abstract

To demonstrate use of computer aided design and 3D printing in creating simulated costochondral cartilage to practice creation of auricular frameworks. To identify a material that most closely simulates cartilage. The costal cartilage of a free floating rib with adjacent synchondrosis was digitally segmented from a CT scan using medical imaging software. The resulting 3D mesh model was exported to 3D modeling software. A negative model was constructed using mesh Boolean and 3D printed. The resulting mold was filled with vinyl polysiloxane or a mixture of silicone and cornstarch to produce the final model for framework carving. Microtia surgeons rated the models’ carving and suturing characteristics relative to human cartilage on a Likert scale. An accurate reproduction of patient specific costal cartilage was produced. The composition material produced a texture and firmness similar to human cartilage. Likert ratings are reported. This study demonstrates a low cost, readily reproducible tool to simulate auricular reconstruction. There may be benefit from use of a patient specific costal cartilage model.