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Related Experiment Video

Updated: Jun 25, 2026

The Establishment of a Murine Maxillary Orthodontic Model

The Establishment of a Murine Maxillary Orthodontic Model

Published on: October 27, 2023

Force system generated by an adjustable molar root movement mechanism.

Rodrigo F Viecilli¹, Jie Chen, Thomas R Katona

¹Department of Orthodontics and Oral Facial Genetics, Indiana University School of Dentistry, Purdue School of Engineering and Technology, Indianapolis, IN 46202, USA. rviecill@iupui.edu

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics

|February 10, 2009

Summary

Periodic adjustments are crucial for orthodontic appliances to maintain optimal tooth movement. This study shows reactivation preserves a favorable force system during molar rotation, unlike non-reactivated systems.

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Last Updated: Jun 25, 2026

The Establishment of a Murine Maxillary Orthodontic Model

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Published on: October 27, 2023

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Published on: August 2, 2024

Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires

Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires

Published on: July 24, 2018

Area of Science:

Orthodontics
Biomechanics
Dental Mechanics

Background:

Accurate tooth movement simulation is vital for effective malocclusion correction.
Developing optimal force systems and appliance designs is key in orthodontics.

Purpose of the Study:

To experimentally verify a 3-dimensional force system for a novel molar root movement strategy.
To assess the impact of spring reactivation on maintaining force system integrity during molar movement.

Main Methods:

Measured forces and moments in 3 planes using a 3D transducer for molar root movement springs.
Compared two experimental groups: one with spring reactivation and one without, during simulated molar rotation.

Main Results:

An unfavorable force system developed after ~5 degrees of molar rotation without reactivation.
Reactivation maintained a favorable force system through 20 degrees of molar movement.

Conclusions:

Current orthodontic appliances necessitate regular adjustments for optimal tooth movement.
Further research is needed to create appliances that deliver ideal force systems throughout the entire range of tooth movement.