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Design, Processing and Characterization of Radially Graded Porous Structure for Dental Implant

Lotfi, Mohammad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58097 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farahmand, Farzam; Movahedi, Mohammad Reza
  7. Abstract:
  8. Functionally graded porous structures are very close to the bone tissue. Parameters that are related to the pore size and other parameters that determine mechanical properties, can closely represent properties of bone tissue. These parameters contain the percentage of the porosity and the pore size on the porosity side, and modulus of elasticity and yield stress from mechanical view. Calibrated structures with complex geometries, containing porous material, also can be produced by 3D printing technology. One application of porous structures is in production of dental implant with a cylindrical shape, containing a dense core, surrounded by a porous region. The aim of the present study is to design an asymmetric graded lattice structure for the fabrication of a dental implant. To create a cylindrical lattice, gradation of the structure is radial, instead of a cubical structure with element size variation. The hybrid cell is designed as a gradable grid with a cylindrical arrangement. The grid is modeled parametrically based on geometric parameters. Girds with various geometries are created based on different geometrical parameters. These grids, as representative volume elements, are analyzed by the finite element method. Mechanical properties of grids are determined according to the size of porous and the geometry of grids. As the result, a probable range for geometrical parameters is introduced. In the second step of the study, the experiment design method in Minitab is used to optimize geometrical parameters to create a structure with maximum yield stress and minimum elasticity modulus, with more than 450µm porous in size. The optimized result obtained from Minitab is closely similar to the results of the finite element
  9. Keywords:
  10. Gradient Structure ; Dental Implant ; Porous Structure ; Mechanical Properties ; Functionally Gradient Implants ; Gradient Lattice Structures

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