ISO 23940:2021

Overview

ISO 23940:2021 - Dentistry - Excavators defines standardized dimensions and performance requirements for handheld dental excavators. This ISO standard provides manufacturers, quality managers and regulatory teams with clear specifications for excavator forms, material selection, mechanical strength, surface quality and labelling to ensure safety, interchangeability and reprocessing suitability of dental excavators.

Key topics and technical requirements

• Scope and classification
  • Covers excavator shapes and forms (Forms A–E), including straight, angled, contra‑angled and spoon (types 501–506) working ends.
• Design and dimensions
  • Detailed drawings and dimension tables specify blade width, thickness, length, neck thickness, blade/shank height and angles. Measurement points and tolerances are defined (typical dimensional tolerance ±0.1 mm, angles ±5°).
  • Maximum overall length is at the manufacturer’s discretion; note that lengths over 173 mm may cause handling/sterilization cassette issues.
• Materials and hardness
  • Working‑end materials shall comply with ISO 21850‑1 (stainless steel materials for dental instruments).
  • Vickers hardness of the finished working end: 550 HV1 to 800 HV1 (test per ISO 6507‑1).
• Mechanical connections
  • Connection between working end and handle must withstand a 450 N tensile load and 0.25 Nm torque without loosening or breaking; tests are specified (tensile and torque test procedures).
• Surface finish and cleanliness
  • Surfaces must be free from production residues and visible defects; handle finishes should be cleanable and uniform.
• Resistance to reprocessing
  • Instruments must withstand 100 reprocessing cycles (or manufacturer‑stated maximum if less) following ISO 17664 cleaning/disinfection/sterilization instructions, with no deterioration or corrosion.
• Marking and labelling
  • Permanent marking requirements: manufacturer name, item/reference number, lot/batch and UDI‑code (exception for handles < 8 mm diameter). Packaging symbols per ISO 15223‑1.
• Test and inspection methods
  • Visual inspection, dimensional measurement (accuracy to 1/10 of tolerance), tensile/torque testing and reprocessing cycle testing are specified.

Applications and who uses this standard

• Dental instrument manufacturers and designers seeking compliance with recognized dental excavator standards.
• Quality assurance and regulatory affairs teams preparing technical documentation and CE/FDA submissions.
• Procurement and clinical engineering evaluating instrument interoperability, sterilization compatibility and life‑cycle claims.
• Sterilization and reprocessing managers validating cleaning and sterilization protocols for reusable dental instruments.

Related standards

• ISO 21850‑1 - Dentistry - Materials for dental instruments (stainless steel)
• ISO 6507‑1 - Vickers hardness test method
• ISO 17664 - Processing instructions for medical devices
• ISO 15223‑1 - Medical device labelling symbols

Keywords: ISO 23940:2021, dentistry excavators, dental excavator dimensions, Vickers hardness, reprocessing cycles, UDI code, dental instrument standard.