Related Experiment Video
Updated: Jun 19, 2026

Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires
Published on: July 24, 2018
An analysis of force between attractive magnets used in orthodontics
1Department of Orthodontics, Fatima Jinnah Dental College & Hospital, Karachi. shazia.naseruddin@gmail.com
Objective:
To compare the results of hard and soft attractive magnet combinations to the gold standard Neodymium Iron Boron Magnets used for extrusion of impacted maxillary canines.
Design:
Experimental and comparative study.
Place And Duration Of Study:
Eastman Dental Institute and Hospital, London, UK in collaboration with Department of Physics and Astronomy University College of London (UCL) during 1996-1998.
Material And Methods:
In vitro experiments with combinations of hard and soft magnets of different morphologies. Load Cell Transducer was used to record the force levels in grams with magnets placed in different vertical, horizontal and angular offsets.
Results:
Three-dimensional mesh plots were created to visualize force level decay with increasing distance. The results were compared with previous study on hard magnet combinations only and observed for "edge effect". The present study force levels were very low albeit the edge effect was negligible.
Conclusion:
Although the edge effect phenomenon present with powerful hard magnets was minimal or nearly absent with the hard and soft magnet combination--the overall force levels were too low to be of any use in clinical scenario for extrusion of deep impacted canines.
Related Concept Videos
Magnetic Force Between Two Parallel Currents
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and the vector product of the length vector along the current element and the field due to the first conductor. According to the...
Magnetic Fields
A magnetic field is defined by the force that a charged particle experiences...
Magnetic Force
The magnetic force acting on a moving charge...
Force On A Current Loop In A Magnetic Field
Potential Due to a Magnetized Object
The vector...
Magnetism
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...

