Research On Reverse Design Of Denture And 3D Printing Technology Based On Titanium Alloy (TC4) Materials

In this paper,titanium alloy(TC4)is used to carry out metal 3D printing of denture.The method is based on the combination of theoretical research and experimental verification.The concrete method is to use the advanced hardware experimental equipment,adopt reverse molding technology,combine some 3D CAD,Finite element analysis and other support software as tools and platforms,and finally get the restoration.The specific content is as follows.(1)The denture of the reverse modeling,the patient has a problem to prepare the teeth,while the use of impression material on the patient’s oral tissue morphology preparation,filling the plaster model.After the gypsum model is dried,the mandibular and clinical standard crowns are scanned with a COMET L3 D scanner with a precision of 0.03 mm.The scanned files are introduced into Geomagic Studio reverse engineering software for processing,including: model point cloud data simplification and noise reduction,model point cloud data fill and surface model reconstruction and entityization,finally generate CAD three-dimensional solid model.The reverse modeling of the denture is the most basic part and the key,since the final model is directly related to the subsequent upper and lower jaw bite and experimental part.(2)The 3D solid model of the obtained CAD is introduced into the three-dimensional software to perform the occlusion of the upper and lower jaw.First,the treated denture is assembled with the mandibular body.The length of the tooth is 8mm and the width is 9mm.If the denture is installed,there is a certain space to add glue to fix,because the thickness of the crown is 1.5mm,need to shape the standard denture to growth 11 mm,width 12 mm.The height of the denture is 1.5mm and the height of the whole denture is 6.5mm.Then the height of the denture is 1.5mm.(3)After satisfying the occlusal relationship,three-dimensional finite element analysis of the denture is required.Firstly,the material attributes and meshing are defined for the denture,and the different loadforce is applied.By looking at the total deformation cloud and the total stress cloud,the deformation of the denture is 0.0011395 mm,the maximum stress is22.588 MPa,the maximum deformation of 0.002 mm when the clinical oral loading is 600 N loadforce,the main stress threshold of 38 MPa,and meet the clinical requirements.(4)The metal 3D printing of the TC4 alloy material was carried out.The laser scanning power,scanning speed and tilt angle.The influence of the geometric dimensions of the specimen,the range of the process parameters,and the orthogonal test.The optimal parameters were determined by observing Rockwell hardness,microhardness and microstructure,with the best laser scanning power of 280 W,scanning speed of 1200 smm /,inclination angle of 55°,and the final printing of the denture.The dentition of the denture is scanned and compared with the designed digital model.It is found that the error of theocclusal part of the denture is smaller than 0.0150 mm.The error of the denture part is0.2524 mm.The error is very small,indicating that the one Group parameters meet the criteria.Through the above research,the use of software and experimental methods of combining denture is feasible,and thus makes the clinical denture becomes no longer a single,although this method is not mature,need to further improve the accuracy,the use of this method can shorten the development cycle and reduce the cost of the product,worthy of further research.