ISO 21850-1:2020

Overview

ISO 21850-1:2020 - "Dentistry - Materials for dental instruments - Part 1: Stainless steel" defines the stainless steels commonly used to manufacture dental instruments. The standard covers material designation, chemical composition ranges for key stainless steel families (austenitic, martensitic, precipitation‑hardening, ferritic), guidance for material selection, and pre‑clinical performance evaluation. It applies to single‑use and reusable dental instruments (handheld or power‑driven), but not to long‑term intra‑oral devices such as crowns, bridges or implants.

Key topics and technical requirements

• Material categories: Specifies a current selection of stainless steel grades suitable for dental instruments grouped as austenitic, martensitic, precipitation‑hardening, and ferritic stainless steels.
• Composition and designation: Chemical composition and material designation follow ISO 15510 where applicable; Annex A lists equivalent stainless steels.
• Selection criteria: Materials should be chosen based on required properties for the intended purpose, considering manufacturing, handling, sterilization and storage effects.
• Demonstration of suitability: A material’s suitability must be shown by either a design evaluation (pre‑clinical/performance evaluation) or by selection from the listed, clinically proven materials.
• Biological evaluation: Final products or representative samples require biological evaluation in accordance with ISO 7405 and ISO 10993‑1.
• Traceability and verification: Manufacturers should confirm stainless steel composition (e.g., supplier Certificate of Analysis - CoA) and document technical delivery conditions.
• Performance factors: Annex B addresses hardness, corrosion resistance and mechanical strength relevant to dental use; Clause 6 covers pre‑clinical performance evaluation.

Practical applications and users

Who uses ISO 21850-1:2020:

• Medical device manufacturers producing dental hand instruments, handpieces, explorers, scalers, extraction forceps, tweezers, burs, implant drivers, sterilization trays, and other dental tools.
• Materials engineers & metallurgists selecting stainless steel grades for tooling and instrument components.
• Regulatory and quality teams ensuring compliance for market approval, biocompatibility testing and supplier documentation.
• Dental laboratories and contract manufacturers validating material specifications and certificates.

Practical benefits:

• Harmonizes stainless steel selection across markets, reducing duplicate testing and approval costs.
• Helps match stainless steel properties (corrosion resistance, hardness, polishability) to instrument function and sterilization cycles.
• Provides clear references for supplier CoAs and biological evaluation requirements.

Related standards

• ISO 15510 - Stainless steels - Chemical composition (material designation reference)
• ISO 7405 - Dentistry - Evaluation of biocompatibility of dental medical devices
• ISO 10993‑1 - Biological evaluation of medical devices - Part 1: Evaluation and testing within a risk management process

Keywords: ISO 21850-1:2020, dental instruments, stainless steel, dentistry standard, material selection, biocompatibility, corrosion resistance, sterilization, stainless steel grades.