Orthodontic Dental Model Process Optimization And Feasibility Study Based On Fused Deposition Modeling

3D printing technology and additive manufacturing technology(Additive manufacturing technology)is an emerging technology based on digitization and layered and formed into layers.It is an important component of advanced intelligent manufacturing.Fused Deposition Modeling(FDM)is the earliest emerging 3D printing technology.It is also the most extensive research area and has unique advantages in equipment cost and application fields.With the rapid development of 3D printing technology,the combination of 3D printing technology and the medical industry has become a research hotspot in recent years and in the future.In the field of orthodontics,most of the traditional orthodontic cases are corrected by metal brackets and wires,relying mainly on the individual experience of the doctor.And it has disadvantages in appearance and convenience.The appearance of invisible orthodontics not only reduces the level of requirements for orthodontists,but also greatly improves aesthetics and convenience.The combination of 3D printing technology and orthodontic fields currently used is mostly performed by stereo lithography(SLA)for the manufacture of orthodontic dental models.Because the equipment and consumables required for this technology are expensive,the level of equipment operators is also high.In order to meet the disadvantages of higher requirements and increased costs for companies,this paper proposes a solution for using FDM to replace SLA for manufacturing orthodontic dental casts.The accuracy of FDM rapid prototyping technology is presented.Error analysis and optimization of process parameters are used as experimental exploration of the apparent performance of the orthodontic model.The finite element analysis method is used to simulate the thermal deformation of the dental model,and its accuracy and reliability are verified by experiments.The main research contents and conclusions are as follows:(1)The accuracy error analysis of fused deposition rapid prototyping is introduced.The reason,process and result of error are explained from three aspects: principle error,molding process error,and post processing error.And for each of the influencing factors,improvements are proposed and measures to reduce errors as much as possible.Provides reference for subsequent optimization of the fused deposition process.(2)Using the orthogonal test method to optimize the process parameters that lead the three-dimensional FDM rapid prototyping machine.Through the analysis of range and variance of the five main factors of print speed,print temperature,layer thickness,filling density,and idle speed,the three main indicators affecting the FDM process are identified(integrated size error,surface The influence factors of roughness and print time are taken into account,and the index relationship is comprehensively considered to obtain the optimum process parameters.(3)Based on the thermodynamics theory,the tooth model was subjected to thermal analysis and the steady-state and transient thermal analysis of the diaphragm was performed by the ansys workbench software.The transient thermal analysis and structural analysis of the tooth model were performed to determine the final deformation of the model.After the simulation investigation,it is verified by experiments.The results show that the simulation results are consistent with the test results.It has been verified that the orthodontic dental model produced by FDM can be applied to orthodontic treatment and meet all indexes.