ISO 6876:2012

Overview

ISO 6876:2012 - "Dentistry - Root canal sealing materials" specifies requirements and standardized test methods for endodontic root canal sealers that set with or without moisture and are used for permanent obturation of the root canal. The scope covers sealers intended for orthograde use (root fillings placed from the coronal aspect). This third edition (2012) updates flow, working time and solubility test procedures and sets new limit values.

Key topics and technical requirements

ISO 6876:2012 defines terminology, sampling, environmental test conditions and detailed test methods for key physical properties:

• Flow - measured using a 0.05 ml sample between glass plates; each disc shall have a diameter of not less than 17 mm.
• Working time - for sealers claiming up to 30 min working time, flow measured 15 s before the end of the stated time must be ≥17 mm.
• Setting time - determined with a Gilmore-type indenter at 37 °C and ≥95% RH; manufacturer claims must be met within specified tolerances.
• Film thickness - maximum 50 µm when tested between flat glass plates under a 150 N load.
• Solubility and disintegration - solubility of set sealer shall not exceed 3.0% by mass; specimens must show no visual disintegration.
• Radio‑opacity - minimum radio-opacity equivalent to 3 mm of aluminium, measured by dental X‑ray and aluminium step wedge comparison.
• Sampling and test conditions - tests carried out at (23 ± 2) °C and (50 ± 5)% RH unless manufacturer states otherwise; preparation per manufacturer instructions.

The standard does not prescribe sterility testing or detailed biological risk assays; it recommends referencing relevant pharmacopoeias and biological evaluation standards.

Practical applications

ISO 6876:2012 provides a harmonized framework for:

• Product development and quality control of endodontic sealers (resin-, zinc-oxide-, bioceramic-based, etc.).
• Type testing and batch verification in independent laboratories.
• Regulatory submissions and conformity assessment where national authorities reference ISO standards.
• Comparative performance evaluation (flowability, film thickness, solubility, radiographic visibility).

Who uses this standard

• Dental material manufacturers and R&D teams
• Clinical and independent dental testing laboratories
• Regulatory bodies and conformity assessment organizations
• Endodontists and professional societies assessing material claims

Related standards and references

• ISO 10993-1, ISO 7405 (biological evaluation recommendations)
• Relevant pharmacopoeias (sterility/purity guidance)
• ISO 1942, ISO 3696, ISO 3665, ISO 6873, ISO 8601 (normative references cited in the document)

Keywords: ISO 6876:2012, root canal sealing materials, endodontic sealer, dentistry standard, flow, setting time, solubility, radio-opacity, film thickness.