BS EN ISO 2157:2016 pdf download – Dentistry — Nominal diameters and designation code numbers for rotary instruments (ISO 2157:2016)
This International Standard 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.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3, Preferred numbers — Series of preferred numbers
ISO 1942, Dentistry — Vocabulary
ISO 6360-1, Dentistry — Number coding system for rotary instruments — Part 1: General characteristics 3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1942 and ISO 6360-1 and the following apply.
3.1
code number
series of numbers for specific detail information for dental rotary instruments (3.4) or their accessories [SOURCE: ISO 6360-1:2004, 3.3.]
3.2
designation code number
resulting designation as derived from the nominal diameter (3.3)
3.3
nominal diameter
theoretical value of the diameter
3.4
rotary instrument
tool used for rotary or oscillating movements, consisting of a working end, neck (if applicable) and
shank, which is constructed to fit into a handpiece
Note 1 to entry: This includes continuous rotation or oscillating instruments.
Note 2 to entry: See Figure 1.
4 Nominal diameters and designation
The nominal diameters, in millimetres, and the designation by code number of the working parts of ental rotary instruments shall be selected from those listed in Table 1, Table 2 and Table 3.
In the range of 2,5 mm to 9,5 mm, it is recommended to use the diameters of the R 20 series. This reduces the number of diameters in this area from 21 to 12 (see Table 2).
4 Nominal diameters and designation
The nominal diameters, in millimetres, and the designation by code number of the working parts of dental rotary instruments shall be selected from those listed in Table 1, Table 2 and Table 3.
In the range of 2,5 mm to 9,5 mm, it is recommended to use the diameters of the R 20 series. This reduces the number of diameters in this area from 21 to 12 (see Table 2).BS EN ISO 2157 pdf download.