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Modified Arnold expander: an alternative for mandibular arch expansion.

Ildeu Andrade¹, Marco Aurélio Benini Paschoal², Natália Couto Figueiredo³

¹Medical University of South Carolina, Department of Orthodontics (Charleston/SC, USA).

Dental Press Journal of Orthodontics

|May 31, 2022

Summary

A new, fixed orthodontic device offers compliance-free mandibular arch expansion for children with moderate crowding and transverse discrepancies. This low-cost appliance achieves significant arch width and alignment improvements in just 3-4 months.

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Area of Science:

Orthodontics
Dentofacial Orthopedics

Background:

Mandibular arch expansion is crucial for correcting transverse discrepancies and crowding.
Traditional appliances like the Schwarz appliance and Lip Bumper require patient cooperation, posing challenges in clinical practice.

Purpose of the Study:

To present a simple, fixed orthodontic device as an alternative for mandibular arch expansion.
To evaluate its efficacy in mixed-dentition patients with moderate tooth-size/arch-length discrepancy and transverse deficiency.

Main Methods:

The study involved four cases of 8-10-year-old patients in mixed dentition.
Treatment combined rapid maxillary expansion (RME) with a Hass expander and a modified Arnold expander (MAE) for mandibular arch expansion.

Main Results:

The compliance-free appliance achieved dentoalveolar decompensation by uprighting posterior teeth.
Treatment resulted in increased arch perimeter and width, and improved tooth alignment.
Successful outcomes were observed within a short treatment period of three to four months.

Conclusions:

The modified Arnold expander (MAE) is an effective, low-cost, and compliance-free appliance for mandibular arch expansion.
It successfully addresses moderate crowding, transverse deficiency, and posterior crossbite, improving overall arch form and aesthetics.