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Do Metal-Ceramic crowns harm your gums? Long-Term study investigates

NCT ID NCT07500636

Knowledge-focused Sponsor: Riga Stradins University 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
Running, but no longer taking on new participants.
Completed This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This completed study followed 32 people who received a single metal-ceramic crown to see if it causes gum changes over 8 years. Researchers compared the gum health around the crowned tooth to the same natural tooth on the opposite side of the mouth. They measured plaque, bleeding, pocket depth, and gum recession during routine dental exams.

What this could mean

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

Active substance
Metal-ceramic crown (dental device)
What this could lead to
If successful, this study could help dentists understand whether metal-ceramic crowns cause gum problems and how to prevent them.
What could go wrong
This is a small, observational study with only 32 participants, so results may not apply to everyone. It does not test a new treatment.

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

32 people

The number who actually took part.

Started

Oct 2015

Finished

Sep 2024

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

20 to 75 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 with a tooth-based metal-ceramic crown intended. * Patients with a good general state of health, i.e. do not suffer from chronic uncontrolled general illnesses (diabetes, cardiovascular diseases, oncological diseases). * Patients who have corresponding natural tooth on opposite side without a fixed dental prosthesis (crown, bridge). Exclusion Criteria: * Pregnancy. * With local inflammation and diseases of the oral mucosa. * With removable prostheses in both jaws. * Smokers (\>20 cigarettes per day). * With an extraction wound next to an exposed tooth. * With neurological or psychiatric problems that affect hygiene.

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As listed by the trial registrant

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

Gingival health Metal ceramic restorations

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