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Which crown is best for Kids' cavities? new study tests bioflex, zirconia, and steel

NCT ID NCT07156838

Disease control Sponsor: Alexandria 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 study tested three types of crowns—bioflex, zirconia, and stainless steel—for restoring badly decayed baby molars in 45 children aged 6 to 8. Researchers checked gum health, plaque buildup, and how well the crowns stayed in place. The goal was to find which crown works best for kids.

What this could mean

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

Active substance
dental crowns (bioflex, zirconia, stainless steel)
What this could lead to
If one crown type proves clearly better, dentists may have a stronger recommendation for restoring decayed baby molars in children.
What could go wrong
This is a small, completed trial with only 45 children, so results may not apply to all kids. Crowns can still fail or cause gum irritation.

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

45 people

The number who actually took part.

Started

Feb 2025

Finished

Dec 2025

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

6 to 8 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: * Children who are free from any systemic disease. * Cooperative children (positive/ definitely positive) according to Frankl's behavior rating scale. * Children with good to fair oral hygiene according to Loe and Silness plaque index. * Primary molars with deep carious lesion, that are indicated for pulpotomy and crown. * Primary molars having two-thirds of root structure left radiographically * Parents' willingness to participate through informed written consent Exclusion Criteria: * Children with oral parafunctional habits. * Primary molars with bifurcation involvement * Presence of abscess or fistula related to the selected tooth * Primary molars with insufficient crown structure

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Conditions

The condition(s) this trial relates to.

dental caries

As listed by the trial registrant

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

Badly decayed primary molars Preformed pediatric posterior crowns

Contacts and locations

Locations

  • outpatient clinic of pediatric dentistry -faculty of dentistry- Alexandria university

    Alexandria, Azarita, Egypt