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, diamond instruments, abrasive instruments and rotary instruments used for oral surgery such as drills, countersinks. Specific tests are specified in the respective product standards, if available. This document does not specify test methods for materials used for rotary instruments. NOTE For these materials see ISO 21850-1 and the respective product standards. This document is not applicable to endodontic instruments (see ISO 3630-1).