24 June 2026

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Postoperative pain after single visit root canal treatment using domestic vs. medical grade sodium hypochlorite: a randomized controlled trial.

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This peer-reviewed endodontics article summarizes clinical evidence from BMC oral health (2026). It focuses on findings that may help dental professionals evaluate treatment decisions, patient outcomes, or clinical protocols.

Abstract

BACKGROUND: Sodium hypochlorite (NaOCl), the primary endodontic disinfectant, is available in both domestic-grade products and specialized medical-grade formulations. The stability and concentration of domestic-grade products are inconsistent, potentially affecting safety and clinical outcomes. This trial compared the impact of domestic-grade versus medical-grade NaOCl on postoperative pain following endodontic treatment in patients with symptomatic irreversible pulpitis. METHODOLOGY: Sixty participants with symptomatic irreversible pulpitis in mandibular molars were randomly distributed into two groups (n = 30). Following instrumentation with Edge X7 rotary files, Group A received domestic-grade NaOCl irrigation, while Group B was treated with a medical-grade formulation. Participants recorded pain intensity on an 11-point numerical rating scale (NRS) at 6, 12, 24, 48, and 72 h. RESULTS: Domestic-grade NaOCl was associated with significantly higher pain levels at 6 h (median 3 vs. 0; p < 0.05) and 12 h (median 2 vs. 0; p < 0.05) compared to medical-grade NaOCl. No significant differences were observed at 24, 48, or 72 h. CONCLUSIONS: Domestic bleach caused significantly higher early postoperative pain than medical-grade sodium hypochlorite due to its unstandardized, higher concentration. Standardized medical-grade irrigants are recommended to maximize patient comfort and clinical predictability. TRIAL REGISTRATION: The protocol for this prospective, parallel group, double blinded, randomized clinical trial was registered at ClinicalTrials.gov ( https://register.clinicaltrials.gov/ ) on 18/11/2025, registration number (NCT07248189). The trial was retrospectively registered.

Key takeaway

Key takeaway: Because the evidence comes from a clinical trial design, the findings may be especially useful when comparing treatment approaches in daily practice.

Introduction from full text

Sodium hypochlorite (NaOCl) is extensively used in root canal treatment and its efficacy depends on the concentration of free available chlorine (FAC). This study aimed to assess the chlorine content of 10 domestically manufactured household bleach products available in the Iranian market and evaluate the effect of temperature, time and daily bottle uncapping on FAC concentration and pH of these products.

Peer-reviewed source

Maha Nasr, Nermine Hassan

BMC oral health. 2026

DOI: 10.1016/J.JOEN.2011.02.019

PMID: 41975390

PubMed: https://pubmed.ncbi.nlm.nih.gov/41975390/

Image: Ozkan Guner (Unsplash)