ISO 2157:2016规定了牙科旋转器械工作部件的标称直径，例如牙钻、实验室牙钻、研磨器械、金刚石器械、心轴和相应的名称。 不包括牙髓器械和刮除器的直径。

ISO 2157:2016 specifies the nominal diameters of the working parts of dental rotary instruments, for example burs, laboratory burs, grinding instruments, diamond instruments, mandrels and the corresponding designation. Excluded are the diameters of endodontic instruments and scaler tips.