Overview
EN ISO 12836:2015 - Dentistry - Digitizing devices for CAD/CAM systems for indirect dental restorations - Test methods for assessing accuracy (ISO 12836:2015) specifies standardized test methods to evaluate the accuracy of digitizing devices used in dental CAD/CAM workflows. It applies to lab-based optical and mechanical-contact scanners in which the object is mounted relative to the scanner (not to hand-held scanners), and it excludes radiographic (X‑ray) and MRI digitization methods. The standard treats the matched point cloud and resulting STL tessellation as the scanned product and defines practical specimen geometries for testing.
Key Topics
- Accuracy components: Defines and distinguishes trueness and precision (per ISO 5725-1).
- Test metrics: Procedures for assessing repeatability, reproducibility, and trueness of digitizing devices.
- Specimens and geometries: Normative test artefacts specified in Annex A–C:
- Inlay-cavity die (sharp edge simulation)
- Crown-and-bridge preparation die (multi-unit specimen with 30 mm centre-to-centre distance)
- Sphere (hemisphere measurement)
- Data format and matching: Emphasizes use of the point cloud/STL as the digitized output and requires software methods to match measured data to reference geometry to quantify discrepancies.
- Test conditions & reporting: Environmental conditioning, measurement protocols, and required elements of a test report are specified to ensure reproducibility and comparability across laboratories and products.
Applications
EN ISO 12836:2015 is intended for practical use by:
- Manufacturers of dental digitizing devices and CAD/CAM systems for design validation and product claims.
- Dental laboratories performing internal quality checks on lab scanners used for indirect restorations (crowns, bridges, inlays).
- Independent test laboratories and certification bodies assessing scanner performance.
- Researchers and educators studying scanner performance, occlusion analysis, and dimensional changes over time.
- Regulatory and procurement teams evaluating technical specifications and acceptance criteria for scanner purchases.
The standard supports reliable fabrication of indirect dental restorations, quality control in digital workflows, and consistent comparison of scanner performance using standardized specimens and metrics.
Related Standards
Normative references and related guidance include:
Keywords: EN ISO 12836:2015, dentistry, digitizing devices, CAD/CAM, accuracy, test methods, indirect dental restorations, trueness, precision, repeatability, point cloud, STL.
