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Updated: Aug 27, 2025

Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment

Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment

Published on: February 23, 2024

Premolar Extraction Affects Mandibular Kinematics.

Alejandra Londoño^1,2, Miguel Assis^1,2, Cinzia Fornai^1,3,4,5

¹Department of Research in Occlusion Medicine, Vienna School of Interdisciplinary Dentistry - VieSID, Klosterneuburg, Austria.

European Journal of Dentistry

|September 27, 2022

Summary

This summary is machine-generated.

Orthodontic premolar extraction can negatively impact jaw movement, affecting mandibular kinematics. This study found altered jaw motion in at least 25% of treated patients, suggesting caution in routine extraction practices.

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Area of Science:

Orthodontics
Biomechanical analysis
Craniofacial function

Background:

Premolar extraction is a common orthodontic procedure but its effects on the stomatognathic system are debated.
The precise impact of premolar extraction on mandibular function remains incompletely understood.

Purpose of the Study:

To investigate the influence of premolar extraction on mandibular kinematics.
To evaluate changes in jaw movement patterns using axiographic tracings.

Main Methods:

Comparison of 45 orthodontically treated patients with premolar extraction against 45 untreated controls.
Systematic three-dimensional axiographic recordings of mandibular movements during protrusion-retrusion and speech.
Analysis of transversal deviations, movement length, and rotation angle using statistical tests and principal component analysis.

Main Results:

Significantly higher mandibular lateral translation and rotation during speech in the extraction group.
Linear regression indicated mandibular lateral translation in protrusion-retrusion predicts group affiliation.
Isometric principal component analysis revealed altered jaw motion patterns in a subset of treated individuals.

Conclusions:

Premolar extraction demonstrably alters mandibular kinematics in a significant portion of patients.
The findings question the routine use of premolar extraction in orthodontic treatment.
Further research is warranted to explore the link between disrupted mandibular kinematics and temporomandibular disorders.