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Finite elements, photoelasticity and strain gauge analysis in straight and angled abutments on three elements implant-supported prosthesis


The aim of this study is to evaluate the stress / strain distribution around implants with external hexagon connection in different situations of inclination using finite elements, photoelastic analysis and strain gage , Two polyurethane blocks will be used and, in each block, three hexagon implants will be embedded in the center of each polyurethane block, perpendicularly to the surface and with the angle of 17°, then the respective microunit abutments to correct the angles will be screwed applying a torque of 20 Ncm On polyurethane blocks plastic prosthetic cylinders will be screwed onto the abutments, which receive standard patterns cast in Co-Cr alloy (n=10). Four strain gauges (SG) will be bonded onto the surface of the block tangentially to the implants. A 3D model of block, implants, abutment and superstructure were created. All constituents were considered perfectly symmetrical, solid, and isotropic. All geometry were exported in mesh to be load. The analysis software (Ansys) for finite element to check the maximum principal stress. On the master model and photoelastic model, each metallic structure will be screwed onto the abutments with a 10 Ncm torque and axial and non-axial load of 30 kgf was applied at nine predetermined points. The data obtained from the strain gauge analyses were analyzed statistically by RM ANOVA and Tukey's test, with a conventional level of significance of p<0.05. The isochromatic fringes obtained in the photoelastic models after each load condition will be recorded with a digital camera, visualized with software to facilitate qualitative analysis. (AU)

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