Study On Digital Design And Manufacture Of Maxillary Prosthesis Based On 3D Printing Technology

As an important method of repairing maxillofacial defects,prosthesis restoration has the advantages of simple and easy,cleanable,easy to repair,easy to match shape and color,less effect of repairing process and favorable observation of wound.The restorative quality of prosthesis has important and far-reaching significance for reconstructing patients’ oral function and regaining the mental health of the patients.However,due to the complex structure of the prosthesis,complex process of the traditional design and manufacturing and the limit of the technician technology,the quality of the prosthesis produced is often uneven,which seriously hinder the promotion and application of the maxillofacial prosthesis technology.With the development of 3D image information collection,Reverse Engineering(RE),Computer aided Design(CAD)and Rapid Prototyping Manufacturing(RPM),it provides a new idea for the design and manufacture of prosthesis.The purpose of this study is to realize the digital design and manufacture of maxillary prosthesis by reverse reconstruction,computer aided design and rapid prototyping.The main work content and results are as follows:(1)The effect of heat treatment on the residual stress and deformation of the prosthesis stents was studied.The model of the mandibular jaw was subjected to stress relief annealing,artificial thermal aging treatment,no heat treatment,model analysis,deviation analysis,distance measurement and analysis,and the effect of heat treatment on the deformation and stress of jaw plate model was verified by MSC heat treatment simulation.It is concluded that the heat treatment process can effectively alleviate the deformation and stress of the jaw plate and the maxillary prosthesis stent.However,there is no significant difference in the effect of stress annealing and artificial thermal aging on the production efficiency.In the actual production,the stress relief annealing is often used in consideration of the production efficiency.(2)To study the biomechanical manifestation of prosthesis restoration.The ABAQUS software was used to analyze the chewing motion of maxillary model and prosthesis model.It is found that the stress value of the clasp is the largest and the stress concentration is concentrated.After repeated chewing,this part prone to fatigue broken,and put forward the corresponding structural improvement.(3)This paper introduces the technical conditions of digital design and manufacturing of maxillary prosthesis,and introduces the whole process of digital design and manufacture of maxillary prosthesis by taking an example of the maxillary jaw defects in patients.After completing the digital design and manufacture of the maxillary prosthesis scaffold and denture,I designed the base,occluder and a mold that is manufactured by Selective Laser Sintering(SLS),which indirectly achieved the maxillary prosthesis digital manufacturing.This study has realized the digital process of maxillary prosthesis design and manufacture,which provides a new method for the design and manufacture of maxillary prosthesis,and has practical application value for maxillofacial defect repair.