Postoperative PainNCT07808684
Impact of Cross-Sectional Design in Single-File Rotary System on Apical Debris Extrusion
A study testing AF One single-file rotary system in people with Postoperative Pain and Irreversible Pulpitis, run by Minia University at 1 site in Egypt.
Trial summary
Endodontic treatment aims to achieve optimal biological outcomes while minimizing patient's discomfort during and after the procedure. Postoperative pain remains a common complication and is considered a multifactorial phenomenon influenced by several factors, including preoperative pain, age, gender, systemic health… Read more about this study
- Who is it for?
- Ages 20 to 40 years
- Conditions the study is for
- Postoperative Pain, Irreversible Pulpitis
- What is being tested?
- AF One single-file rotary system
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 30 participants
- Where
- 1 siteEgypt
- Study dates
- 1 Jun 2026to 30 Dec 2026
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 20 to 40 years
- All sexes
- No healthy volunteers
- Adult
Who may be able to join
- Teeth with mature apex
- Straight root canal or mild curvature not exceeding(5-10) Schneider.
- Has intact crown ( coronal structure)
- Presence of one orifices and one apices, patency achieved by a #10-15 K-file to the apical foramen
Who cannot join
- Previous root canal treatment.
- Internal/external resorption.
- Immature root apices.
- Caries/cracks/fractures on the root surface.
- Root canal curvature more than 10 degrees.
- Teeth in which the apical minor constriction was gauged larger than a size 20 hand file.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Egypt1 site, 1 recruiting
- Recruiting
Endodontics, Faculty of Dentistry, Minia University
Minya, Minya Governorate
Dalia Ali Mokarab, M.D, +201068121523, dalia.mokarab@mu.edu.eg
Ahmed Ali Yossef, M.D, +201007335293, ahmed.yousef@mu.edu.eg
About this study
Official title: Impact of Cross-Sectional Design in Single-File Rotary System on Apical Debris Extrusion and Postoperative Pain Following Single-Visit Root Canal Treatment: An In Vitro and Randomized Clinical Study
Endodontic treatment aims to achieve optimal biological outcomes while minimizing patient's discomfort during and after the procedure. Postoperative pain remains a common complication and is considered a multifactorial phenomenon influenced by several factors, including preoperative pain, age, gender, systemic health, presence of apical periodontitis, instrumentation technique, type and design of endodontic instruments, and the use of intracanal medications.
Read the detailed description
Root canal shaping represents a critical phase in endodontic treatment, as it facilitates effective cleaning and disinfection while preserving the original canal anatomy. The objective is to create a continuously tapered conical shape from coronal to apical regions without inducing procedural errors such as canal transportation, ledge formation, zipping, or perforation.
With advancements in nickel-titanium (NiTi) technology, modern rotary systems have been developed to enhance shaping efficiency, improve debris removal, and reduce preparation time. Recently, single-file rotary systems have gained popularity due to their simplified protocols, reduced instrument fatigue, and improved clinical efficiency.
A novel concept in instrument design involves flat-sided rotary files manufactured from proprietary heat-treated NiTi alloys, such as AF One Blue and Platinum V.EU. These instruments exhibit a modified S-shaped cross-section with an inactive tip and a distinctive flat surface. The flat-sided design reduces the metal mass of the instrument, potentially enhancing flexibility, cyclic fatigue resistance,and facilitating coronal transportation of debris during instrumentation.
In contrast, One Curve is a single-file rotary system manufactured from heat treated C-wire alloy, which offers controlled memory properties, improved flexibility, and enhanced resistance to cyclic fatigue. It operates in continuous rotation and features a variable cross-sectional design that promotes efficient cutting while maintaining effective debris removal during canal preparation.
Apical extrusion of debris is an inevitable consequence of root canal instrumentation. The extrusion of dentinal debris, microorganisms, and irrigants beyond the apical foramen may induce an inflammatory response in the periapical tissues, which is considered a major contributing factor to postoperative pain. The amount of apically extruded debris has been shown to vary according to the design and kinematics of the instrumentation system used.
Despite the continuous evolution in instrument design, there is limited evidence regarding the influence of flat-sided rotary systems compared to non-flat cross-sectional systems on apical debris extrusion and postoperative pain,particularly in curved canals. Furthermore, the potential relationship between debris extrusion and the severity of postoperative pain remains insufficiently explored.
- Conditions
- Postoperative Pain, Irreversible Pulpitis
- Being tested
- AF One single-file rotary system
- Medical subject headings
- Pain, Postoperative
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
AF One single-file rotary systemProcedure or surgery
Also called One Curve rotary system
to evaluate and compare the amount of apically extruded debris using the AF One single-file rotary system, featuring a flat-sided design, and the One Curve rotary system in curved mesiobuccal canals of mandibular first molars. Additionally, this study aims to assess postoperative pain associated with both systems and to investigate the potential correlation between apical debris extrusion and postoperative pain.
| Study group | Role | What they receive |
|---|---|---|
| one curve file | Active comparator | About 15 cases will be subjected to one single file to the full working length. File will be operated at 300 rpm/2.5 Ncm torque in continuous rotation Receives: Procedure: AF One single-file rotary system |
| AF Fanta flat sided file system | Active comparator | About 15 cases will be subjected to one single file to the full working length.File will be operated at 300 rpm/2.5 Ncm torque in continuous rotation Receives: Procedure: AF One single-file rotary system |
What is being measured
The primary outcome is the main question the study is designed to answer.
Treatment of Postoperative Pain
Pain scores will be recorded on Visual Analog Scale (VAS) using a 0 to 10 pain score basis with 0 being no pain and 10 being the worst pain. Recording will be done everyday for 7 days period.
Measured: from 0 hours to 1 week after the procedure
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted9 Sep 2026
- Study start1 Jun 2026
- Primary completion20 Dec 2026 (estimated)
- Study completion30 Dec 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Postoperative PainStudies of the same condition, open and under way.
- More trials run by Minia UniversityThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 30 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Minia University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Nahla Nasr El-Din Fouad, Minia University
- Investigators
- Maged Mohamed Negm, Professor, Study chair, Endodontics Department, Faculty of Dentistry, Cairo University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07808684
- Sponsor's protocol ID
- Single-File Rotary System
- Status last verified
- Jun 2026
- First submitted
- 2 Sep 2026
- Last updated
- 9 Sep 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 9 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Impact of Cross-Sectional Design in Single-File Rotary System on Apical Debris Extrusion and Postoperative Pain Following Single-Visit Root Canal Treatment: An In Vitro and Randomized Clinical Study
- ClinicalTrials.gov ID
- NCT07808684
- Acronym / sponsor ID
- Single-File Rotary System
- Conditions
- Postoperative Pain, Irreversible Pulpitis
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 30 participants (estimated)
- Lead sponsor
- Minia UniversityUniversity, hospital or other
- Study start
- 1 Jun 2026 (actual)
- Primary completion
- 20 Dec 2026 (estimated)
- Study completion
- 30 Dec 2026 (estimated)
- First posted
- 9 Sep 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Endodontic treatment aims to achieve optimal biological outcomes while minimizing patient's discomfort during and after the procedure. Postoperative pain remains a common complication and is considered a multifactorial phenomenon influenced by several factors, including preoperative pain, age, gender, systemic health, presence of apical periodontitis, instrumentation technique, type and design of endodontic instruments, and the use of intracanal medications.
Detailed description
Root canal shaping represents a critical phase in endodontic treatment, as it facilitates effective cleaning and disinfection while preserving the original canal anatomy. The objective is to create a continuously tapered conical shape from coronal to apical regions without inducing procedural errors such as canal transportation, ledge formation, zipping, or perforation.
With advancements in nickel-titanium (NiTi) technology, modern rotary systems have been developed to enhance shaping efficiency, improve debris removal, and reduce preparation time. Recently, single-file rotary systems have gained popularity due to their simplified protocols, reduced instrument fatigue, and improved clinical efficiency.
A novel concept in instrument design involves flat-sided rotary files manufactured from proprietary heat-treated NiTi alloys, such as AF One Blue and Platinum V.EU. These instruments exhibit a modified S-shaped cross-section with an inactive tip and a distinctive flat surface. The flat-sided design reduces the metal mass of the instrument, potentially enhancing flexibility, cyclic fatigue resistance,and facilitating coronal transportation of debris during instrumentation.
In contrast, One Curve is a single-file rotary system manufactured from heat treated C-wire alloy, which offers controlled memory properties, improved flexibility, and enhanced resistance to cyclic fatigue. It operates in continuous rotation and features a variable cross-sectional design that promotes efficient cutting while maintaining effective debris removal during canal preparation.
Apical extrusion of debris is an inevitable consequence of root canal instrumentation. The extrusion of dentinal debris, microorganisms, and irrigants beyond the apical foramen may induce an inflammatory response in the periapical tissues, which is considered a major contributing factor to postoperative pain. The amount of apically extruded debris has been shown to vary according to the design and kinematics of the instrumentation system used.
Despite the continuous evolution in instrument design, there is limited evidence regarding the influence of flat-sided rotary systems compared to non-flat cross-sectional systems on apical debris extrusion and postoperative pain,particularly in curved canals. Furthermore, the potential relationship between debris extrusion and the severity of postoperative pain remains insufficiently explored.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| one curve file | Active comparator | Procedure: AF One single-file rotary systemAbout 15 cases will be subjected to one single file to the full working length. File will be operated at 300 rpm/2.5 Ncm torque in continuous rotation |
| AF Fanta flat sided file system | Active comparator | Procedure: AF One single-file rotary systemAbout 15 cases will be subjected to one single file to the full working length.File will be operated at 300 rpm/2.5 Ncm torque in continuous rotation |
Who may qualify
- Ages
- 20 to 40 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult
Key inclusion criteria (4 listed)
- Teeth with mature apex
- Straight root canal or mild curvature not exceeding(5-10) Schneider.
- Has intact crown ( coronal structure)
- Presence of one orifices and one apices, patency achieved by a #10-15 K-file to the apical foramen
Key exclusion criteria (6 listed)
- Previous root canal treatment.
- Internal/external resorption.
- Immature root apices.
- Caries/cracks/fractures on the root surface.
- Root canal curvature more than 10 degrees.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| AF One single-file rotary systemAlso: One Curve rotary systemto evaluate and compare the amount of apically extruded debris using the AF One single-file rotary system, featuring a flat-sided design, and the One Curve rotary system in curved mesiobuccal canals of mandibular first molars. Additionally, this study aims to assess postoperative pain associated with both systems and to investigate the potential correlation between apical debris extrusion and postoperative pain. | Procedure or surgery | AF Fanta flat sided file system, one curve file |
Primary outcome
Treatment of Postoperative Pain
Time frame: from 0 hours to 1 week after the procedure
Pain scores will be recorded on Visual Analog Scale (VAS) using a 0 to 10 pain score basis with 0 being no pain and 10 being the worst pain. Recording will be done everyday for 7 days period.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 9 Sep 2026.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Maged Mohamed Negm, Professor study chair
Endodontics Department, Faculty of Dentistry, Cairo University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing AF One single-file rotary system in people with Postoperative Pain and Irreversible Pulpitis, run by Minia University at 1 site in Egypt.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 6 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 9 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Egypt. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Nahla Nasr El-Din Fouad Mohamed, MSC (+201009067349, nannanasr248@gmail.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Treatment of Postoperative Pain (time frame: from 0 hours to 1 week after the procedure). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 9 Sep 2026.