Construction of a three dimensional photoelastic model for pelvic biomechanic experiment with stereolithography technology

Abstract

Objective To build a three dimensional photoelastic model for pelvic biomechanic experiment with stereolithography technology. Methods Through the spiral CT scan to obtain medical images, we built CAD model and transformed it to the files with the STL format which could be identified by rapid prototyping machine. The data were input into laser rapid prototyping machine. Three-dimensional pelvic model were fabricated by machine in layer-by-layer manufacturing principle with the material of Somos 11120 Photosensitive resin. Results The model was homogeneous and transparent with smooth surface, no bubbles and cracking deformation. There were no stripes in the field of polarized light refraction when not loaded. Conclusion The model was made successfully with stereolithography technology. Compared with traditional methods, this method could greatly shorten production time and reduce the production costs. Key words: Stereo]ithography; Pelvis; Three dimensional photoelastics; Biomechanics