Overview
ISO 7405:2025 - Dentistry - Evaluation of biocompatibility of medical devices used in dentistry is the ISO international standard that specifies test methods and evaluation processes for assessing the biological effects of dental medical devices. The fourth edition (2025) replaces ISO 7405:2018 and consolidates guidance on sample preparation, test selection, categorization by contact type and duration, and specific in vitro and in vivo tests. The standard covers devices and pharmacological agents that come into direct or indirect contact with the patient; it does not apply to materials/devices that never contact the patient.
Key topics and requirements
- Device categorization
- By nature of contact: non‑contact, surface‑contacting, external communicating, implants
- By duration of contact: limited, prolonged, long‑term exposure
- Biological evaluation process
- Test selection, overall assessment, re‑evaluation principles
- Emphasis on physical and chemical characterization prior to biological testing
- Sample preparation
- General recommendations and special procedures for light‑curing and chemically setting materials
- Specific test methods
- In vitro assays: agar diffusion test, filter diffusion test, dentine barrier cytotoxicity
- In vivo/usage tests: pulp and dentine usage test, pulp capping test, endodontic usage test
- Implant guidance: endosseous dental implant usage (informative annex)
- Advanced/ancillary assays
- Antioxidant responsive element (ARE) reporter assay for oxidative stress
- Margin of Safety (MoS) assessment methodology (informative annex)
- Reporting and assessment
- Defined parameters for result assessment, controls, animal welfare considerations where applicable
- Normative references
Practical applications
- Manufacturers of dental materials and devices use ISO 7405:2025 to design preclinical testing programs that demonstrate biocompatibility for regulatory submissions and product safety files.
- Test laboratories apply the standard’s methods (agar/filter diffusion, dentine barrier, pulp tests) to generate reproducible cytotoxicity and usage data.
- Regulatory bodies and notified bodies rely on the standard to evaluate compliance and risk assessment for marketed dental devices.
- Researchers and dental clinicians consult the standard for validated approaches when assessing novel dental materials (resins, cements, implants, endodontic sealers).
Who should use this standard
- Dental device manufacturers, R&D teams, quality assurance and regulatory affairs professionals
- Contract test laboratories and preclinical researchers
- Regulatory authorities, conformity assessment bodies, and clinical investigators
Related standards
- ISO 7405:2025 was prepared by ISO/TC 106 (Dentistry) in collaboration with CEN/TC 55. It references other ISO standards for test methods and characterization; consult the normative references within the document for cross‑referenced standards (e.g., updated abrasive standards like ISO 6344‑3).
