BS EN ISO 9873 pdf free download

BS EN ISO 9873 pdf free download.Dentistry – Intra-oral mirrors.
4.1.2 Connection between the stem and handle, if applicable 4.1.2.1 One-piece design (not applicable) This requirement is not applicable to intra-oral mirrors with a one-piece design. 4.1.2.2 Two-piece design (applicable) 4.1.2.2.1 Metric thread connection The metric thread dimensions of the connection between the stem and handle shall be M 2,5 in accordance with ISO 724. The length of the thread engagement shall be as shown in Figure 2. The tolerances shall be in accordance with ISO 965-1 and shall be — for the stem 6e, — for the handle 6H. 4.1.2.2.2 Imperial thread connection The imperial thread dimensions of the connection between the stem and handle shall be imperial thread No. 4-48 UNF, in accordance with ISO 263. The length of the thread engagement shall be as shown in Figure 3. The tolerances shall be in accordance with ISO 5864 and shall be — for the stem 2A, — for the handle 2B. 4.1.3 Dimensions of mirror casing and viewing surface Intra-oral mirrors shall meet the dimensions given in Figure 2, Figure 3, and Table 1. 4.1.4 Size designation of mirror head The mirror head size designations are based on the nominal diameter of the casing, d 1 , expressed in millimetres. Each subsequent size increases by 2 mm. 4.1.5 Position of mirror head with respect to the stem The mirror head shall be positioned such that the long axis of the stem bisects the casing to provide a symmetrical mount about the plane surface of the mirror glass/casing. Test in accordance with 5.1. 4.2 Materials 4.2.1 Mirror glass The mirror glass shall be made of polished glass free from visible defects such as waves, chips, scratches and other imperfections observable to the naked eye. Test in accordance with 5.1. 4.2.2 Mirror casing 4.2.2.1 Metallic mirror casing The mirror casing shall be made of metal which is resistant to corrosion, e.g. stainless steel or a plated non-ferrous alloy. Examples of suitable stainless steel or other metal alloys can be found in ISO 7153-1. 4.2.2.2 Plastic mirror casing The material is left to the discretion of the manufacturer provided that it is in accordance with the requirements of this document. 4.2.3 Mirror handle 4.2.3.1 Metallic mirror handle Mirror handles shall be made of metal which is resistant to corrosion, e.g. stainless steel or a plated non-ferrous alloy. Examples of suitable stainless steel or other metal alloys can be found in ISO 7153-1. 4.2.3.2 Plastic mirror handles The material for the plastic mirror handle is left to the discretion of the manufacturer provided that it is in accordance with the requirements of this document. 4.3 Mirror head 4.3.1 Casing of mirror head The casing shall have a formed edge which shall be below the level of the viewing surface of the glass and shall be visibly free from burrs, flash or other irregularities. Test in accordance with 5.1. 4.3.2? Reflecting? surfaces The reflecting surfaces shall allow the image without deformation to be viewed through, or from, the whole of the viewing surface. Test in accordance with 5.1. 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 5.4. 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 5.5. 4.5 Handle All external surfaces of the handle shall be visibly free from imperfections. Test in accordance with 5.1.BS EN ISO 9873 pdf download.