Effect of Two Different Concentrations of Sodium Hypochlorite on Post-Operative Pain Following Single-Visit Root Canal Treatment (NaOCl-RCT)

May 24, 2026 updated by: Faiz ur rahman, College of Physicians and Surgeons Pakistan

Effect of Two Different Concentrations of Sodium Hypochlorite on Post-Operative Pain Following Single-Visit Root Canal Treatment: A Randomized Controlled Trial

This randomized controlled trial aims to evaluate the effect of two different concentrations of sodium hypochlorite (2.5% and 5.25%) on post-operative pain following single-visit root canal treatment. A total of 116 participants requiring primary endodontic treatment will be randomly allocated into two groups according to irrigant concentration. Post-operative pain will be assessed using a 100-mm Visual Analog Scale at 6, 12, 24, and 48 hours after treatment. The study seeks to determine the concentration that provides optimal disinfection with minimal patient discomfort.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

This study will be conducted in the Department of Operative Dentistry, Saidu College of Dentistry, Swat. Sodium hypochlorite is widely regarded as the gold standard irrigant in endodontics because of its tissue dissolution and antimicrobial properties. However, its concentration-dependent cytotoxicity may influence post-operative pain after treatment.

A randomized controlled trial design will be used with two parallel groups receiving either 2.5% or 5.25% sodium hypochlorite during standardized single-visit root canal treatment. A total of 116 participants aged 18-60 years requiring primary root canal therapy will be recruited using consecutive sampling.

All procedures including anesthesia, access preparation, working length determination, instrumentation, irrigation protocol, and obturation will be standardized. Post-operative pain will be recorded using a 100-mm Visual Analog Scale at 6, 12, 24, and 48 hours post-treatment.

Data analysis will be performed using IBM SPSS Statistics. Repeated measures analysis will compare pain scores between groups across different time intervals. Statistical significance will be considered at p < 0.05.

Study Type

Interventional

Enrollment (Estimated)

116

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Adult patients aged 18-60 years Systemically healthy individuals Permanent teeth with closed apices requiring primary root canal treatment Teeth diagnosed with symptomatic/asymptomatic irreversible pulpitis or pulpal necrosis Patients able to understand the Visual Analog Scale Patients willing to provide informed consent and complete follow-up

Exclusion Criteria:

  • Uncontrolled systemic diseases Pregnant or breastfeeding women Allergy to sodium hypochlorite or local anesthetics Previously endodontically treated teeth Teeth with root resorption, vertical root fracture, or open apex Severe periodontal disease or mobility Use of analgesics, antibiotics, or anti-inflammatory drugs within previous 7 days

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: 2.5% Sodium Hypochlorite Group
Participants undergoing single-visit root canal treatment using 2.5% sodium hypochlorite as the irrigation solution.
Drug: Sodium Hypochlorite Irrigation
Participants undergoing single-visit root canal treatment will receive root canal irrigation using either 2.5% sodium hypochlorite or 5.25% sodium hypochlorite solution. Irrigation will be standardized by delivering 5 mL of the assigned solution per canal using a 30-gauge side-vented needle placed 2 mm short of the working length during chemo-mechanical preparation. The concentration of sodium hypochlorite will be the only variable between study groups.
Active Comparator: 5.25% Sodium Hypochlorite Group
Participants undergoing single-visit root canal treatment using 5.25% sodium hypochlorite as the irrigation solution.
Drug: Sodium Hypochlorite Irrigation
Participants undergoing single-visit root canal treatment will receive root canal irrigation using either 2.5% sodium hypochlorite or 5.25% sodium hypochlorite solution. Irrigation will be standardized by delivering 5 mL of the assigned solution per canal using a 30-gauge side-vented needle placed 2 mm short of the working length during chemo-mechanical preparation. The concentration of sodium hypochlorite will be the only variable between study groups.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Post-Operative Pain Following Single-Visit Root Canal Treatment
Time Frame: At 6 hours, 12 hours, 24 hours, and 48 hours after completion of treatment.
Assessment and comparison of post-operative pain intensity between the 2.5% sodium hypochlorite group and the 5.25% sodium hypochlorite group using a 100-mm Visual Analog Scale (VAS).
At 6 hours, 12 hours, 24 hours, and 48 hours after completion of treatment.
Post-Operative Pain Score
Time Frame: 6 hours, 12 hours, 24 hours, and 48 hours after treatment
Assessment of post-operative pain using a 100-mm Visual Analog Scale following single-visit root canal treatment.
6 hours, 12 hours, 24 hours, and 48 hours after treatment

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

College of Physicians and Surgeons Pakistan

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

July 5, 2026

Primary Completion (Estimated)

December 5, 2026

Study Completion (Estimated)

December 30, 2026

Study Registration Dates

First Submitted

May 24, 2026

First Submitted That Met QC Criteria

May 24, 2026

First Posted (Actual)

June 1, 2026

Study Record Updates

Last Update Posted (Actual)

June 1, 2026

Last Update Submitted That Met QC Criteria

May 24, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • SCD-ENDO-NaOCl-2026

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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