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Which root canal tool hurts less? new study aims to find out

NCT ID NCT07250399

Symptom relief Sponsor: Al-Azhar 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 27, 2026 · Updated 2 times

Summary

This study tests two different dental file systems—EdgeOne Fire (reciprocating motion) and Jizai (rotary motion)—to see which causes less pain during and after root canal treatment in upper premolars with infected pulp. Fifty-six adults with moderate spontaneous pain will be randomly assigned to one of the two file types. Pain levels will be measured during the procedure and at several points up to one week afterward, along with any painkiller use. The goal is to find out if the way the file moves affects how much debris is pushed out and how much discomfort patients feel.

What this could mean

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

Active substance
EdgeOne Fire reciprocating file system and Jizai rotary file system
What this could lead to
If one file system clearly causes less pain, dentists may adopt it to make root canals more comfortable for patients.
What could go wrong
This is a small, early-stage study (56 people) comparing two specific tools. Results may not apply to other teeth or file brands, and pain differences could be minor.

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 56 people

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

Started

Oct 2025

Expected to finish

May 2027

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

20 to 50 years

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: * Maxillary first and second bi-rooted premolar teeth having type I root canal. * have mature teeth with closed apex. * Teeth with prolonged response to the pulp tests. * Spontaneous pain (preoperative visual analog scale score )4-6). * Teeth with normal periapical appearance. * Restorable teeth. * Patients who will be able to understand the informed consent form and pain recording scales used in the study will be included. Exclusion Criteria: \-

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Conditions

The condition(s) this trial relates to.

Pain, Postoperative pulpitis

As listed by the trial registrant

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

The effect of instrumentation kinematics on intraoperative and post-operative pain

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

  • from the outpatient clinic of Endodontic Department, Faculty of Dental Medicine for Girls, Al-Azhar University

    RECRUITING

    Cairo, Egypt

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