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The battle of the retainers: which one holds the line?

NCT ID NCT04828096

Disease control Sponsor: Region Örebro County 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 13, 2026 · Last updated Aug 14, 2026 · Updated 1 time

Summary

This trial compares three types of bonded retainers—Penta-one, Ortho-Flextech, and Memotain—to see which is most effective at keeping teeth in their corrected position after braces. Over five years, researchers will track failure rates, complications, and cost-effectiveness in 324 patients. The goal is to find the most reliable retainer to prevent teeth from shifting back.

What this could mean

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

Active substance
Three types of bonded orthodontic retainers: Penta-one, Ortho-Flextech, and Memotain
What this could lead to
If one retainer proves more durable and effective, it could become the preferred choice for keeping teeth straight after braces, reducing the need for repairs.
What could go wrong
This is a long-term trial, and results may vary. Retainers can break or cause gum irritation, and the best option may depend on individual patient factors.

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 324 people

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

Started

Mar 2021

Expected to finish

Sep 2030

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

10 to 60 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 requiring mandibular lingual fixed canine-to-canine retainer after undergoing orthodontic treatment with fixed appliances * Sound enamel on the lingual surface * Calculus-free lingual surface in the lower anterior segment Exclusion Criteria: \-

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Conditions

The condition(s) this trial relates to.

Malocclusion

As listed by the trial registrant

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

Dental malocclusion Stability

Contacts and locations

Locations

  • Postgraduate Dental Education Center

    Örebro, Örebro County, SE-70111, Sweden

  • Universitat Internacional de Catalunya, Department of Orthodontics

    Barcelona, Catalonia, Spain

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