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Hidden braces aim to straighten tilted back molars

NCT ID NCT06858670

Symptom relief Sponsor: Hanoi Medical University Source: ClinicalTrials.gov ↗

What the study statuses mean

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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
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 Results may not be published yet.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 This study
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This status has not been confirmed recently, so it may be out of date.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 Sep 18, 2026 · Last updated Sep 18, 2026

Summary

Researchers at Hanoi Medical University are studying whether small lingual appliances can correct an excessive Curve of Wilson at the lower second molars in people already wearing labial fixed braces. The trial uses a split-mouth design: one side of the mouth receives the auxiliary appliance while the other side serves as a control. Investigators measure changes in the Curve of Wilson and the position of molar cusps using digital impressions taken at the start, after initial leveling, and three months after the appliance is placed.

What this could mean

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

Active substance
auxiliary segmental lingual appliances
What this could lead to
If it works, orthodontists could have a targeted way to correct tilted lower second molars without extra braces on the outside of the teeth.
What could go wrong
This is a small, single-center study with no enrollment yet. The split-mouth design may not reflect how well the approach works in routine practice, and some patients cannot tolerate lingual appliances.

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.

Started

Mar 2025

Expected to finish

Mar 2029

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

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

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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 undergoing labial fixed orthodontic treatment. * Patients exhibiting an excessive (deep) Curve of Wilson at the second molar bilaterally (meaning lingually inclined mandibular second molar). * Patients willing to participate and provide informed consent. Exclusion Criteria: * Patients with limited mouth opening and gagging reflex preventing placement of auxiliary segmental lingual appliances.

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Conditions

The condition(s) this trial relates to.

anodontia Bites and Stings Malocclusion

As listed by the trial registrant

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

Malocclusion Malocclusion; displaced or missing teeth Malocclusions Orthodontic treatment

Contacts and locations

Locations

  • Phenikaa University

    Hanoi, 12116, Vietnam

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