The aim of this study is to evaluate the stress distribution in implants with different types of connections: External Hexagon (EH), Internal Hexagon (IH), Morse-Taper (MT) in low bone density (type IV), as well as varying the diameter of the dental implant. Thus, six 3D models (M1-6) representing implant supported prosthesis in the molar region will be modeled by the 3D finite-element method (FEM-3D): EH, IH and MT implants with 4 x 10 mm (M1-M3); EH, IH and MT implants with 5 x 10 mm (M4-M6). The computer simulation will be performed from CT scans, InVesalius (bone tissue) and CADs software: Rhinoceros 5.0 and SolidWorks 2015 (dental implant). In another stage, the models will be exported to the finite element program (FEMAP 11.0) for production of meshes, restricting conditions, contacts and axial (0º: 200N) and oblique load (45°: 100N). The models will be analyzed by NeiNastram software and imported into FEMAP software to visualization of the results in the form of stress maps for qualitative analysis and, subsequently, quantitative analysis (p<0.05). The main results will be analyzed using von Mises stress maps (MPa), microstrain of bone tissue (¼m) and maximum principal stress (MPa) and interpreted in order to establish a better indication of the implant connection for low density bone tissue.
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