Finite element analysis of the interface between the native bone and its surrounding regenerated bone

Ji, Suk; Lee, Sang Hwa; Kim, Su Gwan; Kim, Byung Ock

Abstract

The purpose of this study was to investigate the concentration of stresses at the interface between the native and the regenerated bone adjacent to cylinder type implant using three-dimensional finite element stress analysis method. Stress magnitude and contours at the interface were calculated. The 3.75x10-mm implant (3i, USA) was used for this study and was assumed to be 100% osseointegrated, and was placed in mandibular bone and restored with a cast gold crown. Using ANSYS software revision 6.0, a program was written to generate a model simulating a cylindrical block section of the mandible 20 mm in height and 10 mm in diameter. The present study used a fine grid model incorporating elements between 165,148 and 253,604 and nodal points between 31,616 and 48,877. This study was simulated loads of 200N at the central fossa (A), at the outside point of the central fossa with resin filling into screw hole (B), and at the buccal cusp (C), in a vertical and 30 degrees lateral loading, respectively. When the quality of native bone adjacent to regenerated bone was poor and lateral force was applied on implant crown, the stress was extended on not only the interface between the native and the regenerated bone but also the native bone. In summary, these data indicate that both the quality of native bone surrounding the regenerated bone adjacent to cylinder type implant and the load direction applied on its prosthesis could influence distribution of stress.