An Experimental Study On The Artificial Porous Structure Of Root - Shaped Implant And Its Accuracy And Flexural Strength

Objective: The purpose of the study was to discuss that the feasibility of 3D printing personalized root analogue implant for clincal applications,as well as detect it’s the accuracy and fracture resistance.Methods: Select 20 out of premolar with orthodontic requirements,CBCT system scanned oral and maxillofacial region of patients before tooth extraction to obtian images,three-dimensional model of premolar tooth was created by Minics10.0 software,stored in STL format, the personalized root analogue implants were manufactured via 3D printing based on STL fie format.After tooth extraction,optical scanning model were build, in order to compare three dimensional accuracy of personalized root analogue implants and premolar teeth. Scaning electton microscopy(SEM) was used to observe the surface morphology of porous structure. After tooth extraction,Root analogue implants and premolars tooth were divided into group A and group B.The two groups were all fixed in the stainless steel clamp,and then placed in universal testing machine, the fixed way was that tooth neck should be level with clamp plane, pressure head of the universal tester formed 90°with the long axis of the tooth, and the pressure was exerted on crowns,was about 3mm from the tooth neck.The fracture resistance of the two groups were detected. The results of fracture resistance were analyzed using SPSS13.0.Results: 1 Form of the personalized root analogue implant manufactured via 3D printing was in accordance with the premolar tooth. Average surface area of personalized root analogue implants compared with premolar tooth, overall decreased by 5.23%, compared with CBCT extraction model,decreased by 5.67%. Average surface area of CBCT extraction model compared with the premolar teeth increased by 1.58%.2 SEM display surface was rough, mutual connection between pore, uniform pore size, the distance between the pore were no difference.3 The average fracture resistances of group A were 2767.92 N and group B were 778.77 N, respectively. The average fracture resistance of Group A was significantly higher than that of Group B(P<0.05).Conclusion:1 Accuracy of the personalized root analogue implant manufactured via 3D printing was high,which fabricating errors was small.2 The personalized root analogue implant manufactured via 3D printing can fully satisfy implant restoration bite force requirements.