Effects of Thread Dimensions of Functionally Graded Dental Implants on Stress Distribution

In this study, stress distributions on dental implants made of functionally graded biomaterials (FGBM) are investigated numerically. The implant body is considered to be subjected to axial compression loads. Numerical problem is assumed to be 2D, and ANSYS commercial software is used for the analysis. The cross section of the implant thread varies as varying the height (H) and the width (t) of the thread. According to thread dimensions of implant and material properties of FGBM, equivalent stress distribution on the implant is determined and presented with contour plots along with the maximum equivalent stress values. As a result, with increasing material gradient parameter (n), the equivalent stress decreases, but the minimum stress distribution increases. Maximum stress values decrease with decreasing implant radius (r). Maximum von Mises stresses increases with decreasing H when t is constant. On the other hand, the stress values are not affected by variation of t in the case of H = constant.

Authors:

• Kaman M. O.
• Celik N.

Keywords:

• Functionally graded biomaterials
• dental implant finite element method.

References:

[1] F. Watari, A. Yokoyama, F. Saso, M. Uo, T. Kawasaki, "Fabrication
and properties of functionally graded dental implant" Composites Part
B, (1997), pp. 5-11.
[2] J. Yang, H.J. Xiang, "A three-dimensional finite element study on the
biomechanical behavior of an FGBM dental implant in surrounding
bone" Journal of Biomechanics, 2007, pp. 2377-2385.
[3] F. Watari, A. Yokoyama, F. Saso, M. Uo, H. Matsuno, T. Kawasaki,
"Imaging of gradient structure of titanium/apatite functionally graded
dental implant" Journal of Japanese Institute of Metals, 1998, pp.
1095-1101.
[4] F. Watari, A. Yokoyama, M. Omori, T. Hirai, H. Kondo, M. Uo, T.
Kawasaki, "Biocompatibility of materials and development to
functionally graded implant for bio-medical application" Composites
Science and Technology, 2004, pp. 893-908.
[5] F. Wang, H.P. Lee, C. Lu, "Thermal-mechanical study of functionally
graded dental implants with the finite element method" Journal of
Biomedical Materials Research Part A, 2006, pp. 146-158.
[6] T.A. Enab, "A comparative study of the performance of metallic and
FGM tibia tray components in total knee replacement joints"
Computational Materials Science, 2012, pp. 94-100.
[7] H.S. Hedia, "Design of functionally graded dental implant in the
presence of cancellous bone" Journal of Biomedical Materials
Research Part B: Applied Biomaterials, 2005, pp.74-80.
[8] D. Lin, Q. Li, W. Li, M. Swain, "Bone remodeling induced by dental
implants of functionally graded materials" Journal of Biomedical
Materials Research Part B: Applied Biomaterials, 2009, pp. 430-438.
[9] A. Sadollah, A. Bahreininejad, "Optimum gradient material for a
functionally graded dental implant using metaheuristic algorithms"
Journal of the Mechanical Behavior of Biomedical Materials, pp. 2011,
1384-1395.
[10] D. Lin, Q. Li, W. Li, S. Zhou, M.V. Swain, "Design optimization of
functionally graded dental implant for bone remodeling" Composites:
Part B, 2009, pp. 668-675.
[11] ANSYS 12.1 Academic Teaching Introductory Help Menu, 2009
[12] C.E. Rousseau, H.V. Tippur, "Compositionally graded materials with
cracks normal to the elastic gradient" Acta Materialia, 2000, pp. 4021-
4033.
[13] M.T. Tilbrook, R.J. Moon, M. Hoffman, "Finite element simulations of
crack propagation in functionally graded materials under flexural
loading" Engineering Fracture Mechanics, 2005, pp.2444-2467.