BS EN ISO 15841:2014 pdf free
BS EN ISO 15841:2014 pdf free.Dentistry一Wires for use in orthodontics
The manufacturer shall declare the following properties, which, when tested in accordance with the test methods described in Clause 6, shall be within the ranges stated by the manufacturer.
Each cross-sectional dimension (diameter, width, height and diagonal, as applicable) of the wire shall be stated to the nearest 0,01 mm. For multistrand wires, the dimensions shall be the internal dimensions of a tube that would just contain the wire.
For Type 2 wires, the austenite finish temperature shall be stated to the nearest 1 °C. Austenite-finish temperature shall be determined in accordance with either 6.3.1 or 6.3.2.
When a manufacturer states that different segments of an orthodontic wire have different mechanical properties, the results for each segment shall be tested separately and stated separately.
The modulus of elasticity, in gigapascals, 0,2 % proof strength, in megapascals, and percentage elongation after fracture when tested in accordance with 6.4.2, shall be stated.
The force deflection rate, in newtons per millimetre, and 0,1 mm offset bending force, in newtons, when tested in accordance with 6.4.3 shall be stated.
The force magnitudes measured during unloading at deflections of 3,0 mm, 2,0 mm, 1,0 mm and 0,5 mm and the permanent deflection after unloading, when tested in accordance with 6.4.3 shall be stated.For the purposes of this International Standard, cadmium, beryllium, lead and nickel are designated to be hazardous elements and the manufacturer shall state the concentrations as a mass fraction expressed as a percentage.
Six specimens of a single product from one batch shall be procured for each test. Where the manufacturer recommends heat treatment prior to clinical use, that heat treatment shall be carried out according to the manufacturer’s instructions, before testing.
Measurement shall be taken using callipers, micrometers, optical comparators or other devices with a accuracy of 0,005 mm.
From the curve obtained by differential scanning calorimetry (see Figure 2), the austenite-finish temperature shall be determined from the high temperature side of the valley, as the point of intersection between the tangent drawn at the inflection point and the asymptotic line to the adjacent baseline curve. The intersection of the tangent lines is determined as the austenite-finish temperature, Taf, and is reported in degrees Celsius.BS EN ISO 15841 pdf download.
