BS EN ISO 1797:2017 pdf download – Dentistry — Shanks for rotary and oscillating instruments

BS EN ISO 1797:2017 pdf download – Dentistry — Shanks for rotary and oscillating instruments 5.1.4 Surface roughness The surface roughness, Ra, for shanks made of metal, tungsten carbide or ceramic material, shall be for the following, as shown in Figure 5 to Figure 8: a) Type 1, Type 2, and Type 4: ≤ 1 µm; b) Type 3: ≤ 0,5 µm. The surface roughness for polymeric materials Ra, shall be ≤6 µm for all types. Test in accordance with 7.4. 5.1.5 Location of marking The location of the marking, if envisaged, should be outside the fitting length. If the marking is applied within the fitting length, l 1 , the outside diameter of the shank with the marking shall not exceed the effective diameter of the shank. Testing shall be carried out by visual inspection. 5.1.6 Colour code of plastic shanks The colour of the plastic shanks shall comply with the colour code of the instrument for which it is used. Testing shall be carried out by visual inspection. 5.2 Material requirements 5.2.1 Shanks made of metal or tungsten carbide 5.2.1.1 Type of material for metal or tungsten carbide shanks The exact type of metal or tungsten carbide material and the treatment given to it are at the discretion of the manufacturer. 5.2.1.2 Hardness for metal or tungsten carbide shanks The hardness for shanks made of metal or tungsten carbide shall be not less than 250 HV5. Test in accordance with 7.5. 5.2.2 Shanks made of ceramic materials 5.2.2.1 Type of material for ceramic shanks The exact type of ceramic material and the treatment given to it are at the discretion of the manufacturer. 5.2.2.2 Hardness for ceramic shanks The hardness for shanks made of ceramic material shall be not less than 1 400 HV0,5. Test in accordance with 7.5. 5.2.3 Shanks made of plastic materials 5.2.3.1 Type of material for plastic shanks The exact type of plastic material and the treatment given to it are at the discretion of the manufacturer. 5.2.3.2 Tensile test for plastic shanks The tensile strength for shanks made of plastic shanks shall be not less than 130 MPa. Testing shall be carried out in accordance with 7.6. 5.2.3.3 Heat resistance and colour stability for plastic shanks This requirement does not apply to single use instruments. Shanks made of plastic material shall show no signs of deformation and there shall be no recognizable colour...