Composite PCL Periodontal Bone Scaffold MC Modeling And 3D Printing Control System Design

For periodontitis diseases,implanting periodontal bone scaffolds is considered as an effective method.Bone scaffolds include materials,modeling and forming process.The modeling and forming process of scaffolds are considered as the important factor.The three-dimensional modeling and the forming process of periodontal bone scaffolds are set as the research goals.As a result,a new method for periodontal tissue scaffold manufacture is provided.The details of this project are as follows:1.The optimized Marching Cube(MC)algorithm is put forward to product periodontal bone modeling.Firstly,the advantages and disadvantages of model based on the traditional MC modeling algorithm and the parallel contour modeling algorithm are analyzed.Then the optimized MC modeling algorithm based on the characteristics of periodontal bone tissue is proposed for modeling.The Visual Studio is used as the software platform and the triangular prism is used as voxel.The neutral point interpolation algorithm is used to determine the surface of the voxel.The periodontal bone scaffold modeling with a good accuracy based on the optimized MC algorithm is produced.2.A heating conical screw micro-extruded periodontal tissue scaffolding process is proposed.The PCL is the main material.The molding equipment capable of heating the raw material chamber at a constant temperature and using a conical screw as an extrusion power source is designed.The mechanical frame and a control system are parts of the equipment.The equipment provides an experimental platform for the construction of periodontal bone scaffolds.3.The effects of system parameters and deviation of periodontal tissue scaffolds are studied.Nozzle diameter,extrusion volume and printing speeding are system parameters.The experimental data show that the reduction of nozzle diameter will improve the quality of the scaffolds;under the premise of effective material accumulation,the reduction of the extrusion volume of the material will reduce the deviation of the scaffolds,geometry;the way of uniform deceleration mode printing is conducive to the scaffolds molding due to scaffolds like cone.The construction of high-quality scaffolds are based on the system parameters.4.The biological properties and mechanical properties of periodontal bone scaffolds are analyzed.In terms of biological performance,PCL mixing different proportions of TCP and ACP materials will improve the biodegradability of PCL materials.The experimental data show that the characteristics of composite scaffolds with PCL:TCP=8:2 match with the regeneration rate of human dental tissue,which can be used for the construction of dental brackets.In addition,the data shows that composite scaffolds have good biosafety.In the aspect of mechanics,the size of pore and the modulus of elasticity of the scaffolds are affected by the filling rate.The experimental data show that the filling rate should be controlled between 40%and 70%.A preliminary periodontal bone scaffolds is constructed.This article can provide an important theoretical and experimental significance for the construction of clinical periodontal tissue bone scaffolds.