ISO 24234:2015 pdf free
ISO 24234:2015 pdf free.Dentistry一Dental amalgam
Mix a mass of dental amalgam sufficient to make a cylindrical testpiece (8±1) mm in length after packing into the die shown in Figure 1.
For a dental amalgam alloy product supplied either as tablets or as a free-flowing powder in bulk, the ratio by mass of the dental amalgam alloy to the dental mercury should be that recommended by the manufacturer. Use a capsule (with a pestle, if needed) that complies with ISO 13897 Use any other mixing accessory that is required to conform to the recommendations given by the manufacturer in accordance with 7.3.1. Use a dental mercury sachet product that complies with this International Standard. If more than one mix is required to make the test-piece, produce these mixes simultaneously using equipment of the same type for each mix. However, if the last mix can be produced within the working time of the first mix, mixing these masses sequentially on a single piece of equipment is allowed.
For pre-capsulated products, use as many capsules as needed. Simultaneously, mix the contents of the capsules using the same number of amalgamators of the same brand and model, or sequentially mix the content of the capsules on a single amalgamator. (The latter is allowed, provided the mixing for the last capsule is completed before the end of the working time of the first.) If necessary, use only a portion of the dental amalgam mix from one of these capsules.
Use an amalgamator that complies with ISO 7488, and that is recommended for mixing the dental amalgam alloy product with dental mercury or mixing the pre-capsulated product. Use the amalgamator setting and mixing time that are recommended by the manufacturer of the dental amalgam alloy or pre-capsulated product (for the mass of dental amalgam alloy that is being mixed). (See 7.3.1.)
NOTE The mass ofa 4 mm diameter amalgam cylinder 8 mm in length is approximately 1,2g.
Apparatus for the preparation of test-pieces for determining creep, dimensional change during hardening, and compressive strength
Use the apparatus as shown in Figures 1 to 5.
Make the holder, the spacers, and the cap of cold-rolled or stainless steel. Make the die and the plungers of hardened tool steel or hardened stainless steel. Hone the working surfaces of the die and the plungers to a core roughness depth (Rk) not greater than 6,3 um when tested in accordance with ISO 13565-2. Set the limits of clearance between the die and the plungers at F7 and h7, respectively, in accordance with ISO 286-2.ISO 24234 pdf download.
