Design and localization algorithm of flap guide plate for jaw defect based on digital 3D printing

Abstract

The anterolateral thigh flap is often used to repair the wound tissue defect. Because it is difficult to carry out the perforating vessels before and after the operation, it is considered to use digital design combined with 3D printing technology to prepare the digital three-dimensional guide plate, and at the same time, the guide plate positioning algorithm is designed according to the error caused by the different placement of the guide plate at the site to be transplanted. First of all, select the patients with jaw defect, make the patient's jaw model, obtain the corresponding plaster working model through 3D scanning, obtain STL data, design the guide plate in combination with Rihnoceros and other software, and print the flap guide plate corresponding to jaw defect with the help of metal powder using 3D printer. Based on sequential CT images, the localization algorithm takes the improved genetic algorithm as the research object, extracts the information of the transplantation area as the parameter space, codes the parameters such as the coordinates of the end points of the flap transplantation, and constructs the target function and fitness function of the transplantation. In the experiment, the soft tissue of the patients with jaw defects can be well repaired based on the guide plate. The positioning algorithm locates the flap graft under the condition of less environmental parameters, and obtains the corresponding diameter parameters.