ISO 23298:2023 PDF

Dentistry — Test methods for machining accuracy of computer-aided milling machines

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Title (English):

ISO 23298:2023

Dentistry — Test methods for machining accuracy of computer-aided milling machines

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 46
Publication date:: May 25, 2023
Edition:: ISO IS 23298 edition 1 version 1
ICS:: 11.060.01

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Description (English):

This document specifies the test methods to evaluate the machining accuracy of computer-aided milling machines as a part of dental CAD/CAM systems, which fabricate dental restorations, such as inlays, crowns and bridges.

Technical details

Technical committee: ISO/TC 106/SC 9 - Dental CAD/CAM systems
SKU: ISO 23298:2023

Abstract

Overview - What ISO 23298:2023 covers

ISO 23298:2023 specifies standardized test methods to evaluate the machining accuracy of computer‑aided milling machines used in dental CAD/CAM systems that fabricate indirect restorations (inlays, crowns and bridges). The standard defines two normative test methods - the metal die method and the software method - and sets out requirements for test specimens, measuring apparatus, data preparation, machining, evaluation and test reporting. It replaces ISO/TR 18845:2017 and is intended for use by manufacturers, laboratories and others involved in device validation and quality assurance.

Key technical topics and requirements

Test methods (Clause 5): Two complementary approaches
- Metal die method (5.1) - evaluates marginal adaptability of machined restorations against precision metal dies (class II inlay, crown, four‑unit bridge).
- Software method (5.2) - compares a scanned file of a milled restoration to a master manufacturing file using reverse‑engineering software to assess margin, intaglio and external surface accuracy.
Target restorations: class II inlay, crown, four‑unit bridge (manufacturer‑specified selections permitted).
Metal die specifications: removable occlusal/shoulder parts, tight dimensional tolerances (removable occlusal diameter difference ≤ 10 μm), and surface roughness S_a

Related standards

Mentioned in the description and other ISO standards

Overview - What ISO 23298:2023 covers

Key technical topics and requirements

Test methods (Clause 5): Two complementary approaches
- Metal die method (5.1) - evaluates marginal adaptability of machined restorations against precision metal dies (class II inlay, crown, four‑unit bridge).
- Software method (5.2) - compares a scanned file of a milled restoration to a master manufacturing file using reverse‑engineering software to assess margin, intaglio and external surface accuracy.
Target restorations: class II inlay, crown, four‑unit bridge (manufacturer‑specified selections permitted).
Metal die specifications: removable occlusal/shoulder parts, tight dimensional tolerances (removable occlusal diameter difference ≤ 10 μm), and surface roughness S_a

ISO 23298:2023 PDF

Technical details

Abstract

Overview - What ISO 23298:2023 covers

Key technical topics and requirements

Related standards

Abstract

Overview - What ISO 23298:2023 covers

Key technical topics and requirements

Related standards

Dentistry — Test methods for machining accuracy of computer-aided milling machines

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