ISO 6876:2025

Overview

ISO 6876:2025 - Dentistry - Endodontic sealing materials is the fourth-edition international standard that specifies the classification, requirements and test methods for materials used to seal root canals and other endodontic sites. It covers conventional orthograde endodontic sealers (Type 1) and sealers intended for other procedures such as apexification, perforation repair, resorption treatment and retrograde root‑end filling (Type 2). The standard clarifies test procedures and marking, packaging and labelling requirements but does not set sterility requirements (national regulations and pharmacopeias apply).

Key topics and technical requirements

ISO 6876:2025 defines the essential properties and standardized test methods dental manufacturers and test laboratories must follow. Main technical topics include:

• Classification of endodontic sealing materials into Type 1 (conventional orthograde use) and Type 2 (other endodontic procedures).
• Physical and performance requirements such as:
  • Appearance
  • Flow (Type 1 only)
  • Working time (Type 1 only) - an alternative procedure is provided in Annex A
  • Setting time
  • Film thickness (Type 1 only)
  • Solubility and disintegration
  • Radiopacity
• Sampling protocols and detailed test methods (apparatus, sample preparation, procedures and treatment of results) for reproducible verification.
• Marking, packaging and labelling requirements to support traceability and regulatory compliance.
• Normative references incorporated for radiopacity and related methods.

The 2025 edition expands scope to include non‑orthograde sealing materials, revises test clarity (flow, working time, setting, solubility) and updates mould materials for setting time tests.

Practical applications - who uses ISO 6876:2025

• Manufacturers of endodontic sealers: product development, internal QC and technical dossiers for market access.
• Independent testing laboratories: perform standardized performance and comparative tests (flow, radiopacity, solubility).
• Regulators and notified bodies: evaluate conformity with internationally accepted performance criteria.
• Dental product procurement and R&D teams: assess material suitability for procedures such as apexification or retrograde root-end filling.
• Endodontists and dental clinicians: understand expected material properties (working/setting times, radiopacity) when selecting sealers.

Related standards and references

• ISO 13116 (radiopacity test method)
• ISO 7405 and ISO 10993‑1 (biocompatibility guidance)
• ISO 11737‑1/2/3 (sterilization process validation)
• ISO 1942, ISO 3630‑1, ISO 20417, ISO 15223‑1 (terminology, instruments and labelling)

ISO 6876:2025 is essential for ensuring consistent, validated performance of endodontic sealing materials and supporting regulatory and clinical confidence in sealer selection and use.