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Could rubber bands replace jaw surgery for underbites?

NCT ID NCT04911400

Disease control Sponsor: Sydney Local Health District Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at whether adding rubber bands (elastics) to standard clear plastic retainers helps keep an underbite correction stable after orthodontic treatment. Researchers want to see if this simple addition can reduce the need for future jaw surgery. The trial involves 42 people who have already completed treatment for a skeletal underbite.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Class III elastics (rubber bands) added to clear plastic retainers
What this could lead to
If it works, this could offer a non-surgical way to maintain underbite correction and reduce the need for jaw surgery.
What could go wrong
This is a small, early-stage study with only 42 participants. The results may not apply to everyone, and the elastics may not prevent relapse or surgery.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 42 people

The number the study aims to enrol. It can still change while the study runs.

Started

Jul 2020

Expected to finish

Dec 2027

An estimate. End dates often move.

Lead sponsor

A government agency

The lead sponsor is a government body.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

12 to 16 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patients that completed their orthodontic treatment for the management of their skeletal class III with upper jaw retrusion that was treated with Class III orthopaedic appliances, followed by full fixed appliances. * No congenital anomalies or craniofacial syndromes * No other orthodontic treatment * No medical history that effects growth Exclusion Criteria: * Congenital anomalies or craniofacial syndromes * Other orthodontic treatment * Medical history that effects growth

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Conditions

The condition(s) this trial relates to.

autosomal dominant prognathism

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Class III malocclusion Underbite

Contacts and locations

Locations

  • Chatswood Orthodontics

    Chatswood, New South Wales, 2067, Australia

  • Sydney Dental Hospital

    Surry Hills, New South Wales, 2010, Australia

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