Abstract
The objective of this investigation is to analyze the influence of trabecular microstructure modeling on the biomechanical distribution of the implant-bone interface. Two three-dimensional finite element mandible models, one with trabecular microstructure (a refined model) and one with macrostructure (a simplified model), were built. The values of equivalent stress at the implant-bone interface in the refined model increased compared with those of the simplified model and strain on the contrary. The distributions of stress and strain were more uniform in the refined model of trabecular microstructure, in which stress and strain were mainly concentrated in trabecular bone. It was concluded that simulation of trabecular bone microstructure had a significant effect on the distribution of stress and strain at the implant-bone interface. These results suggest that trabecular structures could disperse stress and strain and serve as load buffers.
Highlights
Osseointegrated dental implants have been increasingly used to restore masticatory function in edentulous and partially edentulous situations and when only a single tooth is missing
As a numerical method for structure analysis that is suitable for complex biological structures, Finite element (FE) analysis has been widely used to evaluate the effect of various parameters, in the peri-implant region [2,3,4,5,6,7]
Equivalent stress concentration at the implant-bone interface was obvious in a cone-beam computed tomography (CBCT) model, in which stress concentration appeared in the neck of the implant-bone interface, characterized by a cortical shell
Summary
Osseointegrated dental implants have been increasingly used to restore masticatory function in edentulous and partially edentulous situations and when only a single tooth is missing. It is believed that dental implants may be more prone to occlusal overloading, which is often regarded as one of the potential causes of periimplant-bone loss and failure of the implant. Finite element (FE) models have been developed in the past to quantify stress and strain fields in the bony tissue around dental implants [1]. It was always assumed that cancellous bone had a nonporous structure inside the inner cortical bone shell. Since trabecular bone architecture and density can vary greatly among individuals and between anatomical locations within the same individual, it is difficult to predict failure of a biomechanical etiology from these analyses using simplified models; relationships between load arising from the implant and actual structure of the surrounding cancellous bone have not been examined [8]
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