The effect of bone quality on stresses around dental implants : a finite element analysis study

Abstract EN

Background& Objective: the density of bone having an obvious effect on the osseointegration and the success of the dental implants.

The aim of the present study is to evaluate the effect of different bone qualities on the values and distribution of stresses at the bone – implant interface of immediately loaded implants by using three-dimensional (3D) finite elements (FE) analysis.

Materials & Methods: A 3-D FE model of an implant embedded in a block of bone was used in this study.

The implant was LEADER/ ITALIA-Fix type which is specially designed for immediate loading.

ANSYS V.12 program was used to build solid model of the implant and bone, and performing the finite element analysis.

Three types of bony tissue(cortical bone, dense trabecular bone, and low density trabecular bone) were used by changing the properties of bone element to simulate the properties of these types.

Axially directed force(2MPa) was applied on the top of the abutment to simulate the axial occlusal loading.

Results: The results showed that the cortical bone is subjected to the lowest and most regular and gradual distribution of stresses at the implant-bone interface among the 3 qualities of bone, followed by the dense trabecular bone, then the low density trabecular bone.

Conclusion: This study suggested that the stress values and distribution at the implant-bone interface are greatly affected by the quality of bone around dental implants, that is, when the bone density increased the stress value is decreased and gradually and uniformly distributed.