ISO 8325:2023
Dentistry — Test methods for rotary instruments
This document specifies general test methods for rotary instruments used in dentistry. These test methods are used for measuring the dimensional characteristics, neck strength and surface roughness of rotary instruments, such as burs, cutters, polishers, grinding instruments and rotary instruments used for oral surgery such as drills and countersinks.
Specific tests are specified in the respective instrument standards, if available.
This document does not specify test methods for materials used for rotary instruments.
NOTE For materials used for rotary instruments, see ISO 21850-1 and respective instrument standards.
This document is not applicable to endodontic instruments. For endodontic instruments, see ISO 3630-1.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement and test methods
4.1 General
4.2 Ambient conditions
4.3 Measurements
5 Measurement of single characteristics
5.1 Measuring instrument
5.2 Shape of the working part
5.3 Diameter of the working part
5.3.1 Location of measurement points
5.3.2 Procedure
5.3.3 Evaluation of test results
5.4 Neck diameter
5.4.1 Location of measurement points
5.4.2 Procedure
5.5 Dimensions of shanks
5.5.1 Shank diameter
5.5.2 Shank length
5.6 Dimensions of mandrels
5.7 Length of working part
5.7.1 Location of measurement points
5.7.2 Procedure
5.8 Overall length
5.8.1 Location of measurement points
5.8.2 Procedure
5.9 Angle of taper of working part
5.9.1 Location of measurement points
5.9.2 Procedure
5.10 Run-out of the working part
5.10.1 Apparatus
5.10.2 Location of measurement points
5.10.3 Procedure
5.11 Neck strength test
5.11.1 Apparatus
5.11.2 Test force
5.11.3 Procedure
5.11.4 Calculation of test force for neck strength
5.11.5 Evaluation
5.12 Surface roughness
6 Test report
Annex A (informative) Deduction of the neck strength formula
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement and test methods
4.1 General
4.2 Ambient conditions
4.3 Measurements
5 Measurement of single characteristics
5.1 Measuring instrument
5.2 Shape of the working part
5.3 Diameter of the working part
5.3.1 Location of measurement points
5.3.2 Procedure
5.3.3 Evaluation of test results
5.4 Neck diameter
5.4.1 Location of measurement points
5.4.2 Procedure
5.5 Dimensions of shanks
5.5.1 Shank diameter
5.5.2 Shank length
5.6 Dimensions of mandrels
5.7 Length of working part
5.7.1 Location of measurement points
5.7.2 Procedure
5.8 Overall length
5.8.1 Location of measurement points
5.8.2 Procedure
5.9 Angle of taper of working part
5.9.1 Location of measurement points
5.9.2 Procedure
5.10 Run-out of the working part
5.10.1 Apparatus
5.10.2 Location of measurement points
5.10.3 Procedure
5.11 Neck strength test
5.11.1 Apparatus
5.11.2 Test force
5.11.3 Procedure
5.11.4 Calculation of test force for neck strength
5.11.5 Evaluation
5.12 Surface roughness
6 Test report
Annex A (informative) Deduction of the neck strength formula