Overview - ISO 7711-2:2011 (Dentistry: Rotary diamond instruments - Discs)
ISO 7711-2:2011 specifies design, dimensional and performance requirements for rotary diamond discs used in the dental laboratory to cut dental materials such as metals, ceramics, plastics and gypsum. The standard selects five typical disc shapes with defined dimensions and sets requirements for disc blanks, diamond covering, run‑out, mechanical strength and manufacturer information. This part of ISO 7711 complements other parts of ISO 7711 (dimensions, grit sizes and colour codes).
Key topics and technical requirements
- Scope & shapes: Defines five specific disc shapes (very thin, thin, thick - peripheral/rim cutting, thin peripheral/proximal, standard peripheral/proximal) with associated dimensional examples.
- Bore diameter: Unmounted disc bore diameter specified as 1.7 mm.
- Disc blank thickness: Minimum disc blank thickness is 0.05 mm; tolerances for disc blank with diamond grit: ≤0.3 mm → ±0.03 mm; >0.3 mm → ±0.04 mm.
- Preferred sizes: Preferred outer diameters (ISO nominal sizes) include 160, 180, 200, 220 (mm) and preferred grit‑coated thicknesses include 0.15, 0.20, 0.25, 0.30, 0.45 mm.
- Material & strength: Disc blanks shall be stainless steel. Minimum proof strength Rp0.2: ≥1000 MPa for very thin blanks (≤0.1 mm) and ≥800 MPa for thicker blanks (>0.1 mm); tested per ISO 6892‑1.
- Diamond covering: Grain size distribution and colour coding referenced to ISO 7711‑3.
- Run‑out (precision): Circular run‑out radial (rr) and axial (rx) for mounted discs ≤ 0.15 mm (measured per ISO 8325).
- Mounting & shank: Recommends protruding shank lengths for mandrel mounting (Type 1 ≈ 10 mm, Type 2 ≈ 15 mm) and use of mandrel/handpiece per ISO 1797‑1.
- Labelling & documentation: Package labelling must include manufacturer name/trademark, shank type, shape/grit identification, nominal size (in 1/10 mm) and lot number. Published media must state diamond coating width and coated blank thickness.
Applications and users
- Practical for dental laboratory managers, dental technician suppliers, instrument manufacturers, quality engineers and regulatory teams who design, manufacture, procure or validate rotary diamond discs.
- Helps ensure interchangeability, safe mounting, predictable cutting performance and traceability for tasks such as trimming prostheses, cutting ceramics or preparing metal frameworks.
Related standards
Keywords: ISO 7711-2:2011, dental diamond discs, rotary diamond instruments, dental laboratory discs, disc dimensions, run‑out, grit sizes, disc blank, bore diameter, stainless steel.
