Overview
ISO 15098:2024 - "Dentistry - Dental tweezers" is the international standard that specifies design requirements and test methods for metallic dental tweezers of Meriam and College types. Published in 2024 (second edition), the standard covers classification, required dimensions and tolerances, materials, hardness, surface finish, closing/opening forces, resistance to reprocessing, and measurement/test methods. It expressly excludes anatomical tweezers and surgical tweezers.
Key topics and technical requirements
- Scope and classification
- Covers Meriam type (angulated shank, contra‑angulated working end) and College type (straight shank, angled or curved working end).
- Design and dimensions
- Detailed dimensioning for blade width, blade thickness, blade length, blade/shank heights, overall length, blade radius and angle with specified tolerances; measurement points and figures are supplied.
- Working end and handle
- Working ends may be serrated or smooth; serration geometries are defined per type. Handles are required to be serrated.
- Guide pin
- All dental tweezers shall include a guide pin (a stopper is optional).
- Material and hardness
- Material choice is at the manufacturer’s discretion; stainless steel must conform to ISO 21850‑1. Working ends shall meet a Rockwell hardness of 40 HRC to 52 HRC (ISO 6508‑1), with Vickers testing acceptable if converted.
- Surface finish
- All surfaces must be free of defects and residues; any satin finish must be uniform and smooth.
- Closing/opening forces
- Closing/opening forces must be within ±20% of the manufacturer’s stated value. Tip opening shall be 14 mm to 18 mm.
- Resistance to reprocessing
- After sterilization/reprocessing tests, tweezers must show no deterioration in hardness, surface finish or force characteristics and no signs of corrosion.
- Measurement and testing
- Visual inspection, dimensional measurement accuracy (device accurate to 1/10 of tolerance), and mechanical force testing procedures (e.g., using a universal testing machine with 0.1 N accuracy). Force testing requires at least three samples and the median value recorded.
Applications and users
ISO 15098:2024 is essential for:
- Dental instrument manufacturers designing and producing cotton forceps/dental tweezers
- Quality and compliance teams verifying product specifications and CE/market conformity
- Testing laboratories performing mechanical and reprocessing validation
- Procurement and dental clinics specifying instruments for routine dental procedures
- Sterilization/process engineers ensuring reprocessing resilience
Related standards
Key normative references include ISO 21850‑1 (stainless steel), ISO 6508‑1 (Rockwell hardness), ISO 6507‑1 (Vickers conversion), ISO 1101 (geometrical tolerancing), ISO 2768‑1 (general tolerances), ISO 15223‑1 and ISO 17664‑1 (labeling and processing information).
For full figures, detailed tables and test apparatus descriptions, consult the complete ISO 15098:2024 document.
