Related Experiment Video
Updated: Jun 3, 2026
07:11
Treatment of Facial Deformities using 3D Planning and Printing of Patient-Specific Implants
Published on: May 23, 2020
Modified Hyrax expander for the correction of upper midline deviation: a case report
G Farronato1, L Giannini, G Galbiati
1Department of Orthodontics, Fondazione IRCCS Cà Granda, Ospedale Maggiore Policlinico, University of Milan, Milan, Italy. giampietro.farronato@unimi.it
Minerva Stomatologica
|April 8, 2011
Summary
This case report details using a modified Hyrax rapid palatal expander to treat mixed dentition patients with maxillary hypoplasia. The device effectively restores transverse dimensions, regains arch space, and corrects midline deviations.
Area of Science:
- Dentistry
- Orthodontics
- Pediatric Dentistry
Background:
- Maxillary hypoplasia and premature deciduous tooth exfoliation can cause permanent incisor migration and space loss in mixed dentition.
- This necessitates interceptive orthodontic treatment to manage arch discrepancies and ensure adequate space for permanent teeth.
Observation:
- A modified Hyrax rapid palatal expander with a vestibular arm was used in a case report.
- This device addresses transverse maxillary discrepancies and space reduction caused by early tooth loss.
Findings:
- The modified expander successfully restored correct transverse maxillary diameters and midline symmetry (5-6 mm).
- It also achieved arch length recovery, preventing or reducing the need for extensive fixed appliance therapy.
- The vestibular arm component aids in correcting asymmetric transverse discrepancies.
Implications:
- This modified Hyrax expander offers an effective interceptive treatment option for mixed dentition patients.
- It can significantly reduce the overall duration of orthodontic treatment with fixed appliances.
- The device's ability to correct transverse issues and regain space makes it valuable in managing complex pediatric dental cases.
