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Dental crown showdown: which design fits best?

NCT ID NCT06500845

Knowledge-focused Sponsor: Cairo University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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 Results may not be published yet.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
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This status has not been confirmed recently, so it may be out of date.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 26, 2026

Summary

This study tests two different preparation designs (bevel vs. butt) for Peek endocrowns, which are tooth-colored caps for molars that have had root canals. Researchers will check how precisely each design fits the tooth, using a replica technique and microscope. The goal is to see which design gives a better fit, potentially improving dental restorations.

What this could mean

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

Active substance
Peek endocrown (high-performance polymer dental restoration)
What this could lead to
If successful, this could help dentists choose the best preparation design for durable, well-fitting dental crowns after root canal treatment.
What could go wrong
This is a small, early-stage trial with only 24 participants, so results may not apply to everyone. It focuses on fit, not long-term success or patient outcomes.

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 24 people

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

Expected to start

Sep 2025

An estimate. Start dates often move.

Expected to finish

Jun 2026

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 to 50 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: 1. Patient age range from 18 years -50 years old. They should be able to read and write so they can sign the informed consent. 2. Patient should have a good physical and psychologically state to be able to withstand the steps of the restoration procedure. 3. Have a molar with root canal filling with no active periodontal or apical involvement. 4. Patients having root canal treatment teeth indicated for endocrown treatment with 3 or 4 axial walls remaining. 5. Patient with axial wall length not less than 3 mm and not more than 5 mm. 6. Patient should have good oral hygiene and motivation. Exclusion Criteria: 1. Patient with periodontal or apical involvement or improper root canal treatment. 2. Severe loss of the tooth structure in which the amount of the remaining tooth structure is less than 2mm. 3. Patient with poor oral hygiene or with occlusal instability 4. Patient with improper physical or psychological state. 5. Patient not pregnant or lactating.

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Conditions

The condition(s) this trial relates to.

internal hordeolum marginal corneal ulcer

As listed by the trial registrant

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

Endodontically treated molar Internal fit Marginal fit

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Cairo University

    RECRUITING

    Cairo, Egypt

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