ISO 1797-1:1992 pdf download.Dental rotary instruments一Shanks
1 Scope
This International Standard specifies shanks of denial rotary instruments and gives measurement methods for the verification of the dimensions A quality control requirement is added in order to en-sure a high quality level,
Part 1 of ISO 1797 specifies shanks made of metals while part 2 specifies shanks made of plastics.
2 Normative references
The following standards contain provisions which,through reference in this text, constitute provisions of this part of ISO 1797. At the time of publication,the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 1797 are encouraged to investi-gate the possibility of applying the most recenl edi-tions of the standards indicated below Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 3274:1975. Instruments for the measurement of surface roughness by the profile method一Contact (stylus) instruments
of consecutive profile trans-formation - Contact profile meters, system M.
ISO 4288:1985. Rules and procedures for the measurement of surface roughness using stylus in-struments.
ISO 6507-1:1982， Metallic materials 一Hardness test- Vickers test - Part 1: HV 5 to HV 100.
3 Classification
The shanks of dental rotary instruments are classified into the following types, according to their diameters and design:
Type 1: diameter 2.35 mm with groove and flat:
Type 2: diameter 2.35 mm cylindrical.
Type 3: diameter 1.6 mm cylindrical with conical or rounded end.
Type 4: diameter 3 mm cylindrical.
5.1 Material
Shanks shall be made of metal materials such as,for example steel, carbide. The type of material and the treatment given to it is at the discretion of the manufacturer.
5.2 Dimensions
The dimensions and tolerances shall be as shown in figures 4 to 7 and as given in table 1.Dimensions are given in millimeters， surface roughness in micrometres.
The end of the shank for types 1. 2 and 4 shall be either flat, conical or rounded The shape of the end shall be a1 the discretion of the manufacturer
5.3 Surface roughness
The surface roughness， as determined by the meth-ods described in ISO 3274 and ISO 4288, shall be as specified in figures 4 to 7.
5.4 Hardness
The hardness， for shanks made from steel or tung-sten carbide, as determined by the method specified in ISO 6507-1. shall be not less than 250 HV 5.
6 Sampling
The method of taking samples and the number of instruments needed for testing shall be the subject of agreement between the interested parlies.
7 Test methods
7.1 Shank diameters
Measurements shall be made using either tungsten carbide ring gauges checked regularly with mating.ISO 1797-1 pdf download.