Biomechanical Effects of Various Bone-Implant Interfaces on the Stability of Orthodontic Miniscrews: A Finite Element Study

Abstract EN

Introduction.

Osseointegration is required for prosthetic implant, but the various bone-implant interfaces of orthodontic miniscrews would be a great interest for the orthodontist.

There is no clear consensus regarding the minimum amount of bone-implant osseointegration required for a stable miniscrew.

The objective of this study was to investigate the influence of different bone-implant interfaces on the miniscrew and its surrounding tissue.

Methods.

Using finite element analysis, an advanced approach representing the bone-implant interface is adopted herein, and different degrees of bone-implant osseointegration were implemented in the FE models.

A total of 26 different FE analyses were performed.

The stress/strain patterns were calculated and compared, and the displacement of miniscrews was also evaluated.

Results.

The stress/strain distributions are changing with the various bone-implant interfaces.

In the scenario of 0% osseointegration, a rather homogeneous distribution was predicted.

After 15% osseointegration, the stress/strains were gradually concentrated on the cortical bone region.

The miniscrew experienced the largest displacement under the no osseointegra condition.

The maximum displacement decreases sharply from 0% to 3% and tends to become stable.

Conclusion.

From a biomechanical perspective, it can be suggested that orthodontic loading could be applied on miniscrews after about 15% osseointegration without any loss of stability.