抄録
We have developed our own manufacturing method of the material and new artificial models of bone mainly made of polyurethane. It is for operation training and medical education for doctors, because the properties of cutting and bone drilling of existing bone models are not completely the same as real bone. In the new bone model, we can change its structure by changing the ratio of the porous foam of polyurethane. This leads to control and change in the cutting and drilling properties relating to the structure and mechanical behaviors of the material. In this study, to clarify the relationship between the porous distribution and the drilling properties of the models and develop the fundamental technique of order-made new bone models, we evaluated the cutting and drilling properties of the models by compression test, push out screw test and observation by scanning electron microscope (SEM). We found characteristic differences of force-displacement curve by compression test, maximum load values, decreasing force rate and residual force values by screw push out test. In addition, SEM observations showed the differences of size and number of the pores in the materials, suggesting that the characteristic mechanical behaviors are caused by the differences of micro scale structures. Availability of the properties obtained by our proposed experiments as indicators to evaluate the cutting and drilling properties of the bone model are discussed.
