ISO TS 20746:2016 pdf free
ISO TS 20746:2016 pdf free.Dentistry一Determination of the strength of dental amalgam by the Hertzian indentation strength (HIT)
method
dental amalgam product supplied in a sealed capsule that contains measured amounts of dental amalgam alloy (3.1) powder and dental mercury (3.2) with masses that are appropriate for the production of a mass of dental amalgam that is considered to be suitable for a single small or medium size restoration in a single tooth
Note 1 to entry: The dental amalgam alloy powder and dental mercury are separated by a barrier that is broken immediately prior to mixing to allow their contact. The capsule remains sealed until mixing has been completed.
dental amalgam alloy (3.1) powder that has been compressed to form a single entity for the purpose of providing a pre-dosed quantity of the alloy that, when mixed with an appropriate mass of dental mercury (3.2), produces a mass of dental amalgam that is considered to be suitable for a single small or medium size restoration in a single tooth
Note 1 to entry: During mixing, the tablet is intended to break apart, forming a fine powder.
measured quantity of dental mercury (3.2) supplied in a sachet (for use in a reusable mixing capsule) in a mass that, when mixed with an appropriate mass of dental amalgam alloy (3.1), produces a mass of dental amalgam that is considered to be suitable for a single small or medium size restoration in a single tooth
Note 1 to entry: The sachet is intended to rupture during mixing to allow the dental mercury to come into contact with the dental amalgam alloy.
This test utilizes a disc-shaped test-piece to which a linearly increasing force is applied through a hard steel ball sited at the centre of one of the flat faces of the disc. The other face of the disc is in contact with a smooth substrate that is also disc shaped and thicker than the test-piece. The substrate has a Young’s modulus value that is of the same order as that of dentine. Fracture is produced by radial cracks initiating at the surface in contact with the substrate. By having close control of the test-piece, the resistance to fracture is quantified by the fracture force. Dental amalgam products are compared using the values of the fracture force.ISO TS 20746 pdf free.
