Overview
EN ISO 3665:2013 (identical to ISO 3665:2011) defines manufacturer specifications for intra‑oral dental radiographic film and film packets. The standard establishes a classification system by film/process speed and film size, sets sensitometric and physical film characteristics, and specifies packaging, labelling and sampling/testing requirements. It applies to intra‑oral films for manual or automatic processing and excludes films intended for fluorescent intensifying screens or primarily viewed by reflected light.
Keywords: EN ISO 3665:2013, ISO 3665:2011, intra‑oral dental radiographic film, film packets, film speed, film size, sensitometric characteristics.
Key topics and technical requirements
- Film classification - Film/process systems are classified into speed groups (Table 1: D, E, F) with specified speed ranges (e.g., D 14.0–27.9; E 28.0–55.9; F 56.0–111.9 as given in the standard).
- Film sizes - Standard intra‑oral film size numbers (0, 1, 1A, 2, 3, 4, 4A, 5) with defined dimensions and corner radii.
- Sensitometry - Speed and average gradient requirements reference ISO 5799; average gradient must be greater than 1.50; uniform response to radiation is required.
- Physical limits - Maximum film thickness 0.25 mm; packet maximum thickness (excluding tab) 2.0 mm; packet dimensions limited to a small allowance over film size.
- Base plus fog density - Manufacturer limit at point of manufacture: ≤ 0.25; maximum used to set expiry date: ≤ 0.40.
- Packet construction & shielding - Light‑tight enclosure, provision for X‑ray attenuation (lead foil or equivalent) positioned to protect from backscatter; easy unwrapping and smooth rounded edges for patient comfort.
- Labelling & symbols - Use of medical device symbols per ISO 15223‑1; clear indication of radiation side (e.g., embossed dot).
- Storage, handling & expiry - Manufacturers must specify shipping/handling/storage conditions to maintain diagnostic quality up to the expiry date; background radiation can affect shelf life.
- Sampling & testing - Defined sampling plans and test methods for base plus fog, speed and gradient (refer ISO 5799); visual inspection rules.
Applications and users
- Manufacturers of dental radiographic film and film packets - product design, quality control, labelling and shelf‑life claims.
- Dental equipment and consumable suppliers - ensuring compatibility with processing equipment and clinical use.
- Dental clinics and radiography departments - procurement specifications and safe storage/handling.
- Testing laboratories and regulators - compliance testing, audits and device registration.
Related standards (referenced)
EN ISO 3665:2013 is essential for anyone specifying, manufacturing, testing or procuring intra‑oral dental radiographic film to ensure consistent image quality, safety and regulatory compliance.