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Updated: Feb 8, 2026
08:29
A 3D-printed Chamber for Organic Optoelectronic Device Degradation Testing
Published on: August 10, 2018
8.4K
Displacement of teeth without and with bonded fixed orthodontic retainers: 3D analysis using triangular target frames
Firas Chakroun1, Vera Colombo1, Dave Lie Sam Foek2
1University of Zurich, Center of Dental Medicine, Laboratory of Physiology and Biomechanics of the Masticatory System, Zurich, Switzerland.
Summary
Fixed orthodontic retainers significantly reduce anterior tooth mobility in the mandible. Tooth mobility varied by tooth type, and increased loading did not significantly alter displacement with retainers.
Area of Science:
- Orthodontics
- Biomaterials Engineering
- Dental Mechanics
Background:
- Orthodontic treatment often requires retention to maintain tooth position.
- The biomechanical stability of anterior teeth with fixed retainers under load is crucial for long-term outcomes.
Purpose of the Study:
- To quantitatively assess anterior tooth movement in the mandible with and without bonded fixed orthodontic retainers.
- To evaluate the effect of incremental loading on tooth mobility in the presence of retainers.
Main Methods:
- Utilized 3D-printed models of mandibular anterior teeth with simulated periodontal ligaments.
- Applied incremental forces (5-30 N) perpendicular to the lingual surface.
- Measured tooth displacement using an optoelectronic motion tracking device (OPTIS) with and without bonded retainers.
Main Results:
- Bonded retainers significantly reduced tooth mobility (p < 0.0001).
- Tooth mobility varied significantly between individual teeth (p = 0.0381), with tooth #42 showing the most difference.
- Incremental loading did not significantly increase tooth displacement (p > 0.05).
Conclusions:
- Fixed orthodontic retainers effectively decrease mandibular anterior tooth mobility.
- The stabilizing effect of retainers is influenced by tooth type.
- Loading increments within the tested range did not lead to increased displacement in the presence of retainers.
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