Related Experiment Video
Updated: Feb 14, 2026

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
On the stability efficiency of anchorage self-tapping screws: Ex vivo experiments on miniscrew implants used in
Marco Migliorati1, Sara Drago1, Domenico Dalessandri2
1Orthodontics Department, School of Dentistry, University of Genova, largo Rosanna Benzi 10, 16132 Genova, Italy.
Background:
The clinical success of orthodontic miniscrews is strictly related to primary stability, which depends on bone viscoelastic properties too. In this study, we evaluated the short time mechanical response of native bone to miniscrews, by a laboratory test based on dynamic loading.
Methods:
Thirty-six segments of porcine ribs were first scanned by cone-beam computerized tomography to obtain insertion-site cortical thickness, cortical and marrow bone density. Twelve different types of miniscrews were implanted in the bone samples to evaluate the elastic compliance of the implants in response to a point force applied at the screw head normally to the screw axis. The compliance was measured dynamically in a Dynamic Mechanical Analysis apparatus as the Fourier Response Function between the signals of displacement and force. The measurements were repeated in five days successive to the insertion of the miniscrew.
Findings:
The elastic compliance was positively related to observation timepoints, but it was not related neither to the screw type nor to the value of the insertion torque.
Interpretation:
Stability behavior is significantly related to the short time response of native bone rather than to the screw design or the insertion torque values.
Related Concept Videos
Screw: Problem Solving
To evaluate the...
Self-Locking Screw
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
Frictional Forces on Screws
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
Nuclear Stability
To hold positively charged protons together...
RNA Stability
Stability
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...

