ISO 14356:2003 pdf download

ISO 14356:2003 pdf download.Dentistry— Duplicating material.
5.6 Compatibility with refractory investment (and gypsum if applicable)
When tested according to 8.3, the duplicating materials shall impart a smooth surface to, and separate cleanly from, the investment or gypsum product poured against it. The investment and gypsum material poured against the lined surface of the duplicating material specimen shall copy line c for the full length of the distance between lines d1 and d2 (Figure 1).
5.7 Elastic recovery
When tested according to 8.4, the elastic recovery shall be at least 96,50 %.
5.8 Tear strength
When tested according to 8.5, the tear resistance shall be at least 0,3 N/mm for Type 1 materials and at least
1,0 N/mm for Type 2 materials.
5.9 Resistance to fungal growth — Type I materials only
When tested in accordance with 8.6, the specimens shall exhibit no fungal growth.
6 Sampling
Samples of material to be tested shall be procured from a single manufacturing batch as packaged for retail marketing.
NOTE Amounts of approximately 7,5 I of Type I materials and 3,7 I of Type 2 materials are usually enough for conducting all of the tests and for the considerable practice that may be necessary for the test operator to become proficient in specimen preparation and testing.
7 Test methods — General
7.1 Laboratory conditions
Unless otherwise specified in this International Standard, all specimen preparation and testing shall be conducted under ambient laboratory conditions of (23 ± 2) °C and (50 ± 10) % relative humidity. Unless otherwise specified in this International Standard, all equipment and materials used in the tests shall be brought to ambient temperature before use in specimen preparation and testing procedures.
7.2 Verification of apparatus function
Examine all accessories, instruments and equipment before they are used in order to determine whether they are in acceptable working order. Perform whatever calibration steps are necessary to ensure that the items are in compliance with the specifications stated for them in this International Standard, or in any related supporting standard.
7.3 Specimen preparation and testing
7.3.1 General
Unless otherwise specified, prepare and manipulate the materials to be used for forming the test specimens employing the equipment, and following the procedures, recommended in the manufacturer’s instructions [see 11 b), 11 c)and lid)].
Time the schedules for specimen preparation and testing using a timing device such as a stopwatch accurate to ± 1s over a 30 s period.
7.3.2 Preparation of Type I materials
Use the double-boiler method for melting Type 1 materials. The amount of melted material prepared for testing purposes at any one time shall be approximately 700 ml. Melted material remaining after the preparation of one set of specimens may be used for forming other sets of specimens to be formed and tested on the same day, providing that the material can be kept at the recommended temperature and consistency for pouring without re-melting.
7.3.3 Preparation of Type 2 materials
For Type 2 materials, use mass/mass proportioning of the components to be mixed. A volume of approximately 20 ml shall be prepared for each specimen tested.
7.4 Passlfail determinations
Unless otherwise specified in this International Standard, the minimum number of specimens required for pass/fail determinations is either three or five, as indicated by an entry appearing beside the related specimen preparation or test procedure title.
Unless otherwise specified, the following rules apply.
For a three-specimen minimum, make and test a series of three specimens initially. If at least two of the three specimens comply with the related requirement, the material passes. If none complies, the material fails. If only one specimen complies, make three additional specimens. If all three of the additional specimens comply, the material passes: otherwise the material fails.
— For a five-specimen minimum, make and test a series of five specimens initially. If at least four of the five specimens comply with the related requirement, the material passes. If only one or two specimens comply, the material fails. If only three specimens comply, make a series of five additional specimens. If all five of the second series of specimens comply, the material passes; otherwise the material fails.
7.5 Expression of test results
Report the number of specimens tested, the number complying with the specified requirement, and whether
the material passes or fails.
8 Specific specimen preparation and test procedures
8.1 Melting temperature test — Type I materials only
8.1.1 Apparatus
8.1.1.1 Ceramic, glass or stainless steel double boiler system (3.2) having a component that will accommodate a volume of at least 700 ml of the melted duplicating material.
8.1.1.2 Temperature-measuring device, such as a calibrated 76 mm immersion thermometer having graduations of 0,1 °C, or equivalent.
8.1.1.3 Heat source, to provide the temperatures needed for the melting process.
8.1.2 Test procedure (one test)
Observe the rate of melting for the specified volume of material (7.3.2). When the material approaches the final stages of melting, use the device (8.1.1.2) to measure temperature of the material periodically until the moment at which the entire volume is free of lumps and granules. Record the temperature for this occurrence.