An Evaluation Of Stress And Strain Distribution In Cortical And Cancellous Bone Around Microimplant Under Various Loading Conditions- A Finite Element Structural Analysis

Abstract

Aim: The purpose of the present research was to assess the amount of stress and strain in cortical and cancellous bone around micro or mini-implant under variety of loading conditions using Finite Element Analysis (FEA).

Methodology: Three implant designs with the same length and diameter were used. The three-dimensional geometry of the bone was simulated with a cortical bone of three different thicknesses and two medullar bone densities. A 30◦ oblique load of 150 N was applied to the implant restoration. Displacement and stress (von Mises) results were obtained for bone and dental implants.

Results: The strain and stress distributions to the bone were higher for the tissue-level implant for all types of bone. The maximum principal strain and stress decreased with an increase in cortical bone thickness for both cancellous bone densities. The distribution of the load was concentrated at the coronal portion of the bone and implants.

Conclusion: All implants showed a good distribution of forces for non-axial loads, with higher forces concentrated at the crestal region of the bone–implant interface. Decrease in medullar bone density negatively affects the strain and stress produced by the implants.