BS EN ISO 9873 pdf free download

BS EN ISO 9873-2019 pdf free download.Dentistry- Intra-oral mirrors.
4.3.4 Distortion
There shall be no observable distortion when the reflecting surface of the plane or magnifying mirror is tested in accordance with 5A.
4.4 Casing/stem joint strength
The mirror casing/stem joint shall withstand the test load without any sign of weld failure. Distortion
of the casing is not considered as a failure. Test in accordance with £.
4.5 Handle
All external surfaces of the handle shall be visibly free from imperfections.
Test in accordance with £1.
4.6 Resistance to reprocessing
Intra-oral mirrors, including the handle, shall withstand 100 reprocessing cycles, as defined by the manufacturer’s instructions in accordance with ISO 17664, without deformation or showing signs of corrosion. There shall be no visible damage to the reflective coating and there shall be no ingress of water.
The manufacturer shall specify if the mirror handle shall be disassembled from the head for the reprocessing cycle.
The manufacturer shall specify the maximum number of reprocessing cycles for both the mirror and the handle if this is less than 100 cycles. In this case this number shall be used for the test, in place of the 100 cycles.
Test in accordance with 52.
5 Measurement and test methods
5.1 Visual inspection
Conduct visual inspection at normal visual acuity without magnification.
5.2 Resistance to reprocessing
Submit the mouth mirror to 100 reprocessing cycles according to the manufacturer’s instructions in accordance with ISO 17664. The reprocessing cycle shall include the manufacturer’s recommended methods of cleaning, disinfection and sterilization, in accordance with ISO 17664.
Inspect all surfaces of the instrument for any signs of corrosion or surface defects and inspect the reflective surface of the mirror for any loss of integrity.
NOTE Discolorations due to water stains are not signs of corrosion.
If the manufacturer specifies a maximum number of reprocessing cycles allowed, this specified number
shall be used in place of the 100 cycles.
5.3 Determination of nominal magnification for magnifying mirrors
5.3.1 Apparatus
The apparatus for determination of nominal magnification is shown in Figure 4.
6 © ISO 2019 – All rights reserved
BS EN ISO 9873:20 19
ISO 9873:20 19
The hole, key 1, which is 10 mm in diameter, has cross-wires positioned as shown and a light source situated immediately behind it. A white card, key 2, marked with squares as shown, is fixed close to the hole, so that the image of the cross-wires will be in the same horizontal plane as the cross-wires.
5.3.2 Procedure
Place the mirror (with or without the handle) as shown in Figure 4 and move it forward or backward until the sharpest image is obtained in the centre square of the card. Measure the focal distance,f to ± 1 mm, between the mirror and the card. Calculate the nominal magnification, M, in accordance with 4.3.3.BS EN ISO 9873 pdf download.