Preparation of Medical Magnesium Matrix Composite for Bone Defect and Design Method of 3D Printed Material

In this study, Magnesium matrix composites with better biodegradability and bioactivity were adopted as scaffold materials, and Mg-2.8Zn-1.2Zr alloy and Mg-2.8Zn-1.2Zr-2 theta-CP composite materials were obtained with smelting method. Additionally, thermal-deformation tests of materials were conducted. In the test, the Mg-2.8Zn-1.2Zr alloy and the Mg-2.8Zn-1.2Zr-2 theta-CP composite showed crystallization on the surface of the material during the thermal-deformation process. The optimum thermo-deformation temperature ranges of Mg-2.8Zn-1.2Zr alloy and Mg-2.8Zn-1.2Zr-2 theta-CP composite were [270 degrees C, 310 degrees C] and [320 degrees C, 360 degrees C], respectively, indicating the addition of theta-CP can enhance the high temperature resistance of the composite. In addition, this material was used for 3D printing design of the jaw bone. 10 maxillary cyst specimens were selected, their CT data were collected, and 3d reconstruction was performed in the defect part. The defect part of the bone was masked, the normal structure of the jaw region was restored, 3d modeling was conduct, and the external morphology of the scaffold in the jaw defect part by Boolean operation was obtained. The results showed that the modeling of the jaw defect part met the design requirements, and the bone scaffold design of the jaw roughly matched the defect part.