PD ISO TR 18845-2017 PDF

Full title and description

ISO/TR 18845:2017 — Dentistry — Test methods for machining accuracy of computer-aided milling machines. This technical report specifies test methods to evaluate the machining accuracy of computer-aided milling machines used in dental CAD/CAM systems for manufacturing restorations such as inlays, crowns and bridges.

Abstract

ISO/TR 18845:2017 provides standardized test procedures and specimen types for assessing dimensional and machining accuracy of CNC milling machines within dental CAD/CAM process chains. The report is intended to help manufacturers, test laboratories and dental‑technology users measure and compare machine performance relevant to the production of dental restorations.

General information

• Status: Withdrawn / Superseded (replaced by ISO 23298:2023).
• Publication date: June 2017 (2017-06).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 11.060.01 (Dentistry — in general).
• Edition / version: Edition 1 (Technical Report, 2017).
• Number of pages: 28 pages.

Scope

Specifies test methods to evaluate the machining accuracy of computer‑aided milling machines as part of dental CAD/CAM systems that fabricate indirect restorations (for example inlays, crowns and bridges). It addresses measurement of machining performance using defined test specimens and procedures so that machine capability and comparative assessments can be carried out consistently.

Key topics and requirements

• Defined test specimens and geometries representative of dental restorations for repeatable machining tests.
• Measurement procedures and reference measurement techniques to quantify machining accuracy (dimensional conformity and form deviation).
• Procedures for recording and reporting results to support comparison between machines and setups.
• Guidance for test conditions (material, tools, fixturing and machine settings) to promote reproducible testing.
• Framework for interpreting machining errors in the context of dental restoration requirements (e.g., fit and margins).

Typical use and users

Primary users include dental milling‑machine manufacturers, dental‑CAD/CAM system suppliers, dental laboratories, independent testing and calibration laboratories, and standards/regulatory bodies. The report is used to set up benchmark tests, verify machine performance during development and commissioning, and support product specifications and supplier evaluations.

Related standards

ISO/TR 18845:2017 has been superseded by ISO 23298:2023 (Dentistry — Test methods for machining accuracy of computer‑aided milling machines). Other related standards cover complementary topics in the dental CAD/CAM chain, for example ISO 12836:2015 (test methods for accuracy of digitizing devices), ISO 18739 (vocabulary for CAD/CAM process chain) and ISO 1942 (dental vocabulary).

Keywords

dentistry, CAD/CAM, milling, CNC, machining accuracy, test methods, dental restorations, crowns, bridges, inlays, ISO, dental standards.

FAQ

Q: What is this standard?

A: ISO/TR 18845:2017 is a Technical Report from ISO that specified test methods for assessing the machining accuracy of computer‑aided milling machines used in dental CAD/CAM systems.

Q: What does it cover?

A: It covers standardized test specimens, measurement procedures and reporting practices to evaluate dimensional and machining accuracy of dental milling machines used to produce restorations such as crowns, bridges and inlays.

Q: Who typically uses it?

A: Manufacturers of dental milling machines and CAD/CAM systems, dental laboratories, test/calibration laboratories, and conformity/quality teams use the report to benchmark and validate machine performance.

Q: Is it current or superseded?

A: ISO/TR 18845:2017 has been withdrawn/superseded and the corresponding published standard is ISO 23298:2023 (published May 2023), which replaces and updates the test methods. Users should refer to ISO 23298:2023 for the current, published requirements.

Q: Is it part of a series?

A: It belongs to the body of ISO standards maintained by ISO/TC 106/SC 9 on dental CAD/CAM systems and is related to other standards that cover digitizing (ISO 12836), vocabulary for the CAD/CAM process chain (ISO 18739) and dental terminology (ISO 1942). Together these documents support a consistent approach to testing, measurement and terminology across the CAD/CAM workflow.

Q: What are the key keywords?

A: Key keywords are: machining accuracy, milling, dental CAD/CAM, test methods, CNC, restorations, crowns, bridges, inlays, ISO.