ISO 15854:2021 download free.Dentistry-Casting and baseplate waxes.
1 Scope
ISO 15854 specifies the classification of and requirements for dental casting and dental baseplate waxes together with the test methods to he employed to determine compliance with these requirements.
ISO 15854 does not apply to waxes supplied for additive manufacturing or CAD/CAM-based procedures.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of ISO 15854. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1942, Dentistry — Vocabulary
ISO 6873, Dentistry — Gypsum products
ISO 860 1-1, Date and time — Representations for information interchange — Part 1: Basic rules
ISO 8601-2, Date and time — Represent ations for information interchange — Part 2: Extensions
ISO 22112, Dentistry — Artificial teeth for dental prostheses
3 Terms and definitions
For the purposes of ISO 15854, the terms and definitions given in ISO 1942 and the following apply.
ISO and I EC maintain terminological databases for use in standardization at the following addresses:
8.2.2.12 Polyethylene film
Flat, smooth, crease and wrinkle-free, in approximately square sheet5 no less than 50 mm on a side.
8.2.2.13 Timing devices
Clocks or timers to permit intervals from 60 s to 25 h to be noted, accurate and reading to 1 s.
8.2.2.14 Deadweight
For loading the glass plate (8.2.2.8), according to the number of test pieces involved, such that the total load per test piece Is (23 ± 1) N.
8.2.3 Preparation of test pieces
Lubricate the mould (8.2.2.6) internally with a very thin film of silicone grease as release agent and place it on a smooth glass slab (LU.!). Preheat both to a temperature (10 ± 5) K above the melting point of the wax, which temperature shall be maintained until the liquid wax Is ready to be poured.
NOTE I The melting point of the wax, if not known from the manufacturer’s or supplier’s information, can he determined by a procedure such as that indicated in Annex A.
Place a sufficient quantity of wax. breaking into pieces as necessary, in the pan. NOTE 2 For guidance, the mould volume Is about 0.5 ml per test piece.
IF an infrared lamp is used for heating, place the pan on a thermally-insulating surface which is approximately 130 mm below the infrared lamp (i.e. such that the wax is irradiated from above), thereby heating the wax. Stir the wax constantly until It is completely melted and its temperature reaches (10 ± 5) K above the melting point of the wax.
If a hot-plate is used for heating, place the pan on the hoiplate, thereby heating the pan and thus the wax. Stir the wax constantly until It Is completely melted and its temperature reaches (10 ± 5) K above the melting point of the wax.
If an oven Is used for heating, place the pan in the oven, thereby heating the pan and the wax. Stir the wax from time to time until it is completely melted and its temperature reaches (10 ± 5) K above the melting point of the wax.
Once the wax has reached the required temperature, remove the mould (82.2,6) and glass slab (8.2.2.7) from the oven and pour the liquid, without splashing, into the mould. As the wax solidifies and shrinkage occurs, add more liquid wax, avoiding the trapping of any bubble of air in any ‘pipe’ that Is forming. The mould shall be slightly overlilled to allow for cooling shrinkage and subsequent compression.
The loss of volatile components when the wax is molten can lead to changes in properties. It is recommended to minimize the time when molten, and preferably to less than 5 mm.
When the wax has lost its surface gloss, place a smooth, flat aluminium foil-covered glass plate (8.2.2.8), preheated to (10 * 5) K above the melting point of the wax and lubricated as above, on top of the mould (foil side in contact with the wax). Add the deadweight (8.2.2.14) to the top of the foil-covered glass plate such as to apply a force of (23 ± 1) N per test piece, and such as to load the test pieces uniformly, for (30 ± 1) mm. Remove the deadweight and the glass plate. carefu]ly peel off the aluminium foil and remove excess wax progressively by drawing a straight-edged non-damaging (e.g. plastic) scraper. using a negative rake angle, across the mould, repeating as necessary to ensure that each test piece’s top face is smooth, parallel and flush with the mould’s top face.
Cool the mould containing the test piece(s), still resting on the glass slab (82.2.21, In water at (23 ± 2) °C (Zi) and then remove the mould from the glass slab. Check that the lower surface of each test piece is flat, smooth and flush with the mould’s lower surface. Carefully remove each test piece from the mould. Check that the cylindrical surface is uniformly smooth and flaw-free. If either check shows any
product fails. If one result only meets the requirement, repeat the test a further three times. To comply, all three additional results shall meet the requirement.
9 MarkIng and packaging
9.1 Marking
Each container shall be marked dearly with at least the following information:
a) trade or brand name of the product, Including any article number or other specific ldentlf1er
b) name and address of the manufacturer or authorized representative agent;
c) lot number (batch number);
d) type, class and description of wax according to Clause 4
e) for Type 1, minimum net mass, or number of pieces for prefabricated patterns: for T,pe 2, minimum net mass and sheet dimensions, if rectangular;
f) for Type 1, if the manufacturer makes a claim for the value of the residue on ignition (9), or if the value is greater than 0,1 % by mass, this shall be stated;
g) recommended storage conditions.
han expiry date is given, it shall be in accordance with the ISO 8601 series.
9.2 Packaging
The packaging shall not alter the wax and shall protect it against damage and contamination.
Type 2 wax sheets shall be interleaved with separating paper, to prevent self-adhesion.
10 Test report
The test report shall include at least the following items:
a) identification of the tested wax, including lot or batch number (9.1);
b) for each test requirement, 5.1— 5.JQ. as appropriate, a statement as to whether the outcome is pass or fail, and If fail the observations or reason(s) for this conclusion;
c) for 5.2. each flow value obtained shall be included, in order;
d) for £10. each percentage residue value obtained shall be stated, in order
e) any circumstances or conditions thought likely to have affected the results or their validity;
f) reference to this document and its year of publication, i.e. ISO 15854:2021;
g) any deviation from any olthe test methods specified, whether deliberate or accidental: if deliberate the reason shall be stated.
For test reports commissioned from external test houses, the following Items shall also be included:
h) complete identification of the tested wax, including name, manufacturer or authorized representative agent, article number or other specific identifier, and lot or batch number (9.1):
i) procurement source and number of packs (see Clause 6)
j) whether or not each of the requirements of Clause 9 were satisfied: