Biomechanical role of peri-implant trabecular structures during vertical loading

Abstract

The aim of this study was to identify the load transfer paths in cortical bone and trabecular structure of cancellous bone in the jawbones for loads from endosseous implants. Maxillae were resected from beagle dogs 6 months after implant surgery and imaged using micro-computed tomography (micro-CT). A three-dimensional structure was produced based on the CT data and peri-implant trabecular structure was observed. Load transfer paths were analyzed from the results of three-dimensional finite element analysis. Furthermore, buffer actions in bone trabeculae when strain increased during stress analysis and when loads were applied were observed. Peri-implant bone trabeculae were seen extending into the upper and lower cortical bone from the fixture. The direction of bone trabecular alignment corresponded with the load transfer paths. In addition, analysis with increased strain confirmed that trabecular structures could serve as load buffers. These results suggest that bone trabeculae supporting load transfer from implants undergo remodeling.

Three-dimensional Observation of Decrease in Pulp Cavity Volume Using Micro-CT: Age-related Change

“…In recent years, the development of micro-CT has enabled three-dimensional observation 1,11,13) and detailed quantitative evaluation of teeth. Oi et al 14) reported three-dimensional morphological change with age in the pulp chamber of maxillary first premolars by observing and calculating the volume ratio of the pulp chamber and root bifurcation of the root cavity.…”

Consideration of shear modulus in biomechanical analysis of peri-implant jaw bone: Accuracy verification using image-based multi-scale simulation

“…The trabecular architecture of the model used in the present study was nearly isotropic, but not all trabecular architectures are necessarily isotropic. We previously analyzed the maxillary bone of beagle, and found that the values of the mechanical properties in the buccolingual direction were lower than those in the mesiodistal and crown-root directions 11) . Where the trabecular architecture is anisotropic, the shear modulus cannot be determined from the Young modulus and Poisson ratio, unlike the case for isotropic materials.…”

“…If prescribed displacement is applied (Dirichlet problem) in the same way as in our previous paper 11,12) , the implants are only compressed without bending and only stress can be evaluated. In contrast, in the Neumann problem, the displacement must be evaluated.…”

“…However, in the simulation models used in previous studies, cancellous bone structure was simplified as a block, and analytic errors in the region of cancellous bone in particular have been identified 10) . We, therefore, carried out a stress analysis using an FE model that closely resembled the structure of cancellous bone (which was named the 'precise model' by Stegaroiu), and reported the biomechanical role played by peri-implant cancellous bone 11,12) . At the same time, our findings suggested that a detailed investigation of the mechanical properties of cancellous bone regions is needed when carrying out stress evaluation of periimplant jaw bone, and that shear properties may be an important factor for consideration.…”

Association between the peri-implant bone structure and stress distribution around the mandibular canal: A three-dimensional finite element analysis

“…In mechanical analysis of peri-implant bone, precise reproduction of trabecular structure thus also enables more detailed analysis, making it possible to elucidate the biomechanical role played by peri-implant bone, particularly cancellous bone. Matsunaga et al performed analysis using an FE model that closely reproduced trabecular structure in three dimensions, and reported that the peri-implant trabecular structure is closely connected with its biomechanical role 10,11) . It was previously reported that the patient may experience discomfort even when the implant is not actually perforating the mandibular canal, probably due to effects of transmission of stress from the trabecular bone 12) .…”