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Related Experiment Video

Updated: Apr 28, 2026

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

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Mandibular kinematic changes after unilateral cross-bite with lateral shift correction.

F Venancio¹, J A Alarcon, L Lenguas

¹Department of Stomatology IV, School of Dentistry, University Complutense of Madrid, Madrid, Spain.

Journal of Oral Rehabilitation

|June 5, 2014

Summary

This summary is machine-generated.

The Hyrax expander effectively corrected mandibular function in children with cross-bite, significantly improving lateral shift and excursion range compared to expansion plates. This orthodontic treatment offers better outcomes for cross-bite correction.

Keywords:

children jaw movements kinesiography mandibular shift maxillary expansion unilateral cross-bite

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Area of Science:

Orthodontics
Pediatric Dentistry
Craniofacial Development

Background:

Unilateral cross-bite with functional shift is common in children.
Maxillary expansion is a key treatment for correcting cross-bite.
The impact of different expansion devices on mandibular kinematics requires further investigation.

Purpose of the Study:

To compare the effects of slow maxillary expansion using expansion plates versus Hyrax expanders on mandibular kinematics in children with unilateral cross-bite.
To evaluate changes in maximum vertical opening, lateral mandibular shift, and lateral excursions post-treatment.

Main Methods:

A randomized prospective study involving 60 children (7.1–11.8 years old).
Participants were divided into three groups: expansion plate (n=15), Hyrax expander (n=15), and a control group with normal occlusion (n=30).
Mandibular kinematics were recorded before and 4 months after treatment.

Main Results:

The Hyrax expander group showed significant improvements in lateral mandibular shift and normalized lateral excursions.
The expansion plate group demonstrated increased lateral shift from rest and greater contralateral excursion compared to controls.
Hyrax expander treatment led to decreased lateral shift from maximum opening and increased homolateral excursion.

Conclusions:

The Hyrax expander, particularly with an acrylic occlusal covering, demonstrated superior efficacy in improving mandibular lateral shift and normalizing lateral excursion range.
Slow maxillary expansion with Hyrax expanders is more effective than expansion plates for cross-bite correction in children.
Orthodontic treatment with Hyrax expanders positively influences mandibular function after cross-bite correction.