Testing of dental implants using an in vivo finite element model

Citation
T. Gunter et al., Testing of dental implants using an in vivo finite element model, BIOMED TECH, 45(10), 2000, pp. 272-276
Citations number
21
Categorie Soggetti
Research/Laboratory Medicine & Medical Tecnology
Journal title
BIOMEDIZINISCHE TECHNIK
ISSN journal
00135585 → ACNP
Volume
45
Issue
10
Year of publication
2000
Pages
272 - 276
Database
ISI
SICI code
0013-5585(200010)45:10<272:TODIUA>2.0.ZU;2-S
Abstract
The finite element method (FEM) makes it possible to simulate biomechanical situations on a computer. In the present study the so-called voxel method [9, 14, 17, 18, 19] was used for the construction of the mandible model. Fo r this, the relationship between the biological tissue (e.g. bone) and the corresponding attenuation coefficient of CT data (Hounsfield units = HU) we re utilized. The CT data were obtained from an edentulous patient provided with a prosthesis borne on two titanium implants. In a parallel study, the bite forces of the same individual were measured. These were recorded digitally in three dimensions (cranio-caudal, anterior- posterior and left-right) The forces determined by a special program were t hen transferred to the FEM model implants. We were able to show that a bar joining the implants had a far greater effect on maximum equivalent stress than was expected from the measuring data alone. The highest stress at maxi mum occlusive force was lowered by 704 % on using the connecting bar. On ch ewing, a stress reduction of 59.9 % was observed. The reduction in stress a chieved by the bar could, we believe, prolong the life of the implant.