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Related Experiment Video

Updated: May 19, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Published on: February 23, 2024

Orthodontic tooth movement with clear aligners.

Carl T Drake¹, Susan P McGorray, Calogero Dolce

¹Private Practice 310 Susan Drive, Suite 1, Normal, IL 61761, USA.

|August 29, 2012

Summary

This summary is machine-generated.

Clear aligner material fatigue does not significantly impact orthodontic tooth movement (OTM) over an eight-week period. This study found no difference in OTM between weekly and biweekly aligner replacement schedules.

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Area of Science:

Orthodontics
Biomaterials Science
Dental Mechanics

Background:

Clear aligners are a valuable tool for studying orthodontic tooth movement (OTM).
The potential influence of aligner material fatigue on OTM has not been extensively investigated.
Understanding factors affecting OTM is crucial for optimizing orthodontic treatment.

Purpose of the Study:

To evaluate the impact of in vivo clear aligner material fatigue on the rate and amount of orthodontic tooth movement.
To compare OTM in subjects using weekly replaced aligners versus those using biweekly replaced aligners.
To investigate the role of subject-specific factors in OTM with clear aligners.

Main Methods:

Prospective study involving 15 subjects undergoing orthodontic treatment.
An upper central incisor was programmed for 0.5 mm movement every two weeks using clear aligners.
Weekly polyvinyl siloxane (PVS) impressions were taken for digital model fabrication and OTM measurement.
Cone beam computed tomography (CBCT) was used to characterize OTM.
Results were compared to a historical control group (37 subjects) using biweekly aligner replacement.

Main Results:

No significant difference in total OTM was observed between the weekly aligner group (mean 1.11 mm, SD 0.30) and the biweekly control group (mean 1.07 mm, SD 0.33) (P = 0.72).
Over an eight-week period, clear aligner material fatigue did not significantly affect the rate or total amount of tooth movement.
The study design controlled for programmed tooth movement, allowing for the assessment of material fatigue effects.

Conclusions:

Clear aligner material fatigue does not play a significant role in the rate or amount of orthodontic tooth movement over an eight-week treatment period.
The frequency of aligner replacement (weekly vs. biweekly) does not appear to influence OTM outcomes within this timeframe.
Further research may explore longer treatment durations and different aligner materials to fully elucidate the role of material fatigue in OTM.