Efficacy of Lasers in Root Canal Treatment, Part II: Postoperative Pain

March 9, 2026 updated by: Sara Zakaria Fahim, Future University in Egypt

Efficacy of 2780 nm Er,Cr:YSGG and 940 nm Diode Lasers in Root Canal Treatment, Part II: Postoperative Pain

The aim of this study is to evaluate in vivo the post operative pain after laser root canal treatment in necrotic teeth in an evidence-based clinical trial. The null hypothesis being tested is that there is no difference in post operative pain between conventional irrigation and the two types of lasers used.

Forty-five patients are equally divided into 3 separate groups :

  • Group A (Conventional): 2.5% NaOCL and 17% EDTA.
  • Group B(Dual): saline along with Er,Cr:YSGG laser and diode laser combination
  • Group C(Combined): saline along with 17% EDTA and diode laser combination Each patient is given pain scale chart Numeric Rating Scale (NRS) to record his/her pain level before any endodontic treatment. All data will be collected, tabulated, summarized, and statistically analyzed.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Postoperative pain is a common complication following conventional endodontic treatment. According to a systematic review, the frequency of endodontic postoperative pain is between 3% and 58% of patients.Postoperative pain is attributed to chemical, mechanical and microbiological factors.

Residual microorganisms remaining due to the complexity of the root canal system and the limited penetration capability of conventional irrigants are directly responsible for Post operative pain The aim of this study is to evaluate in vivo the post operative pain after laser root canal treatment in necrotic teeth in an evidence-based clinical trial. The null hypothesis being tested is that there is no difference in post operative pain between conventional irrigation and the two types of lasers used.

Forty-five patients are equally divided into 3 separate groups :

  • Group A (Conventional): 2.5% NaOCL and 17% EDTA.
  • Group B(Dual): saline along with Er,Cr:YSGG laser and diode laser combination
  • Group C(Combined): saline along with 17% EDTA and diode laser combination Each patient will be given pain scale chart (NRS scale) to record his/her pain level before any endodontic treatment. After disinfection, local anesthetic, tooth isolation, access cavity preparation and final obturation. Patients are asked to mark on a numeric rating scale (NRS) to determine incidence of postoperative pain and rate its intensity at 6, 12, 24, 48, 72 hours, and 7 days after the procedure All data will be collected, tabulated, summarized, and statistically analyzed.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
45

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

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

Study Locations

  • Egypt
    • Abbassia
      • Cairo, Abbassia, Egypt, 11566
        • Ain Shams University

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Patients who had asymptomatic, single-rooted maxillary anterior teeth with necrotic pulp and periapical lesion with a periapical index score of 3 or 4
  • Patients complaining of no pain and without fistulous tract
  • Closed apex.
  • Acceptance to participate in the study.

Exclusion Criteria:

  • Antibiotic use within the last month, anti-inflammatory analgesic use within the last 5 d, systemic diseases or allergic reactions, calcified canals, root resorption, previous root canal treatment.
  • Periodontal diseases, presence of swelling or fistulous tract.
  • Vulnerable group including pregnant females, mentally or physically disabled individuals. - Technical difficulties during root canal treatment such as; curved roots, broken files, over instrumentation, overfilling or incomplete filling.

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: Double

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: Conventional group A
Drug: Conventional group
conventional disinfection using 2.5% sodium hypochlorite and 17% EDTA
Other Names:
  • (NaOCl/EDTA)
Experimental: Dual laser group (Er,Cr:YSGG/Diode)
Device: Dual laser group
Er,Cr:YSGG intracanal laser irradiation to remove smear layer followed by diode laser for disinfection
Other Names:
  • (Er,Cr:YSGG/Diode)
Experimental: Combined group (EDTA/Diode):
Combination product: Combined group
17% EDTA was used to remove smear layer followed by diode laser for disinfection
Other Names:
  • (EDTA/Diode)

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Postoperative pain assessment
Time Frame: Measure changes in post-operative pain 6 hours after intervention in the three groups using NRS

Patients will be asked to mark Numeric rating scale (NRS) to determine incidence of postoperative pain and rate its intensity. The NRS consisted of a line anchored by two extremes "No pain" and "the worst pain".

  • Pain level assigned to one of 4 categorical scores:
  • No pain (0), Mild (1-3), Moderate (4-6) and Severe (7-10).
Measure changes in post-operative pain 6 hours after intervention in the three groups using NRS
Postoperative pain assessment
Time Frame: Measure changes in post-operative pain 12 hours after intervention in the three groups using NRS

Patients will be asked to mark Numeric rating scale (NRS) to determine incidence of postoperative pain and rate its intensity. The NRS consisted of a line anchored by two extremes "No pain" and "the worst pain".

  • Pain level assigned to one of 4 categorical scores:
  • No pain (0), Mild (1-3), Moderate (4-6) and Severe (7-10).
Measure changes in post-operative pain 12 hours after intervention in the three groups using NRS
Postoperative pain assessment
Time Frame: Measure changes in post-operative pain 24 hours after intervention in the three groups using NRS

Patients will be asked to mark Numeric rating scale (NRS) to determine incidence of postoperative pain and rate its intensity. The NRS consisted of a line anchored by two extremes "No pain" and "the worst pain".

  • Pain level assigned to one of 4 categorical scores:
  • No pain (0), Mild (1-3), Moderate (4-6) and Severe (7-10).
Measure changes in post-operative pain 24 hours after intervention in the three groups using NRS
Postoperative pain assessment
Time Frame: Measure changes in post-operative pain 48 hours after intervention in the three groups using NRS

Patients will be asked to mark Numeric rating scale (NRS) to determine incidence of postoperative pain and rate its intensity. The NRS consisted of a line anchored by two extremes "No pain" and "the worst pain".

  • Pain level assigned to one of 4 categorical scores:
  • No pain (0), Mild (1-3), Moderate (4-6) and Severe (7-10).
Measure changes in post-operative pain 48 hours after intervention in the three groups using NRS
Postoperative pain assessment
Time Frame: Measure changes in post-operative pain 72 hours after intervention in the three groups using NRS

Patients will be asked to mark Numeric rating scale (NRS) to determine incidence of postoperative pain and rate its intensity. The NRS consisted of a line anchored by two extremes "No pain" and "the worst pain".

  • Pain level assigned to one of 4 categorical scores:
  • No pain (0), Mild (1-3), Moderate (4-6) and Severe (7-10).
Measure changes in post-operative pain 72 hours after intervention in the three groups using NRS
Postoperative pain assessment
Time Frame: Measure changes in post-operative pain up to 7 days after intervention in the three groups using NRS

Patients will be asked to mark Numeric rating scale (NRS) to determine incidence of postoperative pain and rate its intensity. The NRS consisted of a line anchored by two extremes "No pain" and "the worst pain".

  • Pain level assigned to one of 4 categorical scores:
  • No pain (0), Mild (1-3), Moderate (4-6) and Severe (7-10).
Measure changes in post-operative pain up to 7 days after intervention in the three groups using NRS

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Future University in Egypt

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Ain Shams University

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 (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 1, 2022

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
October 30, 2022

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
February 1, 2023

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
November 8, 2023

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
November 8, 2023

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
November 13, 2023

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
March 11, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 9, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
March 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • FDASU-Rec ID 041909

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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