SIST EN ISO 6873:2000
(Main)Dental gypsum products (ISO 6873:1998)
Dental gypsum products (ISO 6873:1998)
Migrated from Progress Sheet (TC Comment) (2000-07-10): Revision of EN 26873:1991.
Dentalgipse (ISO 6873:1998)
In der vorliegenden Internationalen Norm werden die Anforderungen festgelegt und eine Typeneinteilung der Gipse vorgenommen, die in der Zahnheilkunde Anwendung finden, wie zum Beispiel bei der Abdrucknahme und der Herstellung von Modellen, Abgüssen oder Formen. Sie enthält die anzuwendenden Prüfverfahren, um die Übereinstimmung mit diesen Anforderungen festzustellen. Außerdem enthält sie die Anforderungen an die Etikettierung der Packungen und an die entsprechende Gebrauchsanweisung, die jeder Packung beigefügt werden muß.
Produits dentaires a base de gypse (ISO 6873:1998)
La présente Norme internationale donne une classification des, et spécifie les exigences relatives aux, produits à base de gypse utilisés à des fins dentaires, telles que la prise d'empreintes buccales, la fabrication de modèles, de moulages ou de matrices. Elle spécifie les méthodes d'essai à appliquer pour déterminer la conformité à ces exigences. Elle renferme également des prescriptions concernant l'étiquetage des emballages et les instructions appropriées accompagnant chaque emballage.
Dental gypsum products (ISO 6873:1998)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 6873:2000
01-julij-2000
1DGRPHãþD
SIST EN 26873:2000
Dental gypsum products (ISO 6873:1998)
Dental gypsum products (ISO 6873:1998)
Dentalgipse (ISO 6873:1998)
Produits dentaires a base de gypse (ISO 6873:1998)
Ta slovenski standard je istoveten z: EN ISO 6873:2000
ICS:
11.060.10 =RERWHKQLþQLPDWHULDOL Dental materials
SIST EN ISO 6873:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 6873:2000
INTERNATIONAL ISO
STANDARD 6873
Second edition
1998-03-01
Dental gypsum products
Produits dentaires à base de gypse
A
Reference number
ISO 6873:1998(E)
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ISO 6873:1998(E)
Contents
Page
1 Scope. 1
2 Normative reference . 1
3 Definition. 1
4 Classification and designation . 1
5 Requirements . 2
Quality .
5.1 2
5.2 Fluidity at pouring time (Type 1 materials only). 2
Setting time.
5.3 2
5.4 Linear setting expansion. 2
5.5 Fracture (Type 1 materials only) . 2
5.6 Compressive strength . 2
5.7 Reproduction of detail. 2
6 Sampling. 3
6.1 Sampling. 3
6.2 Test conditions . 3
6.3 Mixing method . 3
7 Test methods. 3
7.1 Inspection . 3
7.2 Fluidity at pouring time for Type 1 materials. 3
7.3 Setting time. 4
7.4 Linear setting expansion. 6
7.5 Fracture . 7
© ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet central@iso.ch
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Printed in Switzerland
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7.6 Compressive strength. 7
7.7 Reproduction of detail. 8
8 Packaging, marking and information to be supplied by the
manufacturer. 10
8.1 Packaging. 10
Labelling .
8.2 10
8.3 Information to be supplied by the manufacturer . 11
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Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national standards bodies (ISO member bodies). The work of
preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which
a technical committee has been established has the right to be represented
on that committee. International organizations, governmental and non-
governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 6873 was prepared by Technical Committee
ISO/TC 106, Dentistry, Subcommittee SC 2, Prosthodontic materials.
This second edition cancels and replaces the first edition (ISO 6873:1983),
which has been technically revised.
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INTERNATIONAL STANDARD ISO ISO 6873:1998(E)
Dental gypsum products
1 Scope
This International Standard gives a classification of, and specifies requirements for, gypsum products used for
dental purposes such as making oral impressions, moulds, casts or dies. It specifies the test methods to be
employed to determine compliance with these requirements. It also includes requirements for the labelling of
packaging and for adequate instructions to accompany each package.
2 Normative reference
The following standard contains provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the edition indicated was valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods.
3 Definition
For the purposes of this International Standard, the following definition applies.
3.1
dental gypsum product
dental product composed essentially of hemihydrate of calcium sulfate and any necessary modifiers
NOTE Colouring matter and flavouring, if present, are regarded as necessary modifiers.
4 Classification and designation
The five types of gypsum product used in dentistry are classified in accordance with this International Standard as
follows:
Type 1: Dental plaster, impression
Type 2: Dental plaster, model
Type 3: Dental stone, model
Type 4: Dental stone, die, high strength, low expansion
Dental stone, die, high strength, high expansion
Type 5:
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5 Requirements
5.1 Quality
The material shall be uniform and free from foreign matter and lumps, and when mixed according to the
manufacturer's instructions shall produce a homogeneous mix.
5.2 Fluidity at pouring time (Type 1 materials only)
When tested according to 7.2 at a pouring time of 1,25 min, the fluidity of type 1 materials shall be equal to or
greater than 70 mm.
5.3 Setting time
When tested according to 7.3, the setting time of type 1 materials shall be in the range of 2,5 min to 5,0 min and the
setting time of all material types shall be within 20 % of the value claimed by the manufacturer in 8.3 c). If the
manufacturer claims a range of setting time, then the midpoint of this range is taken as the value claimed by the
manufacturer.
5.4 Linear setting expansion
When tested according to 7.4, the setting expansion shall be within the range listed in table 1.
Table 1
Compressive strength
Type Setting expansion range MPa
% min. max.
1 0 to 0,15 4,0 8,0
2 0 to 0,30 9,0 —
3 0 to 0,20 20,0 —
4 0 to 0,15 35,0 —
5 0,16 to 0,30 35,0 —
5.5 Fracture (Type 1 materials only)
When broken in accordance with 7.5, Type 1 impression plaster shall break with a clean fracture and be readily
reassembled to form the shape and size of the original unbroken specimen.
5.6 Compressive strength
When tested according to 7.6, the compressive strength shall meet the requirements of table 1.
5.7 Reproduction of detail
Types 1 and 2 when tested according to 7.7, line (c) in figure 3 a) shall be reproduced.
Types 3, 4 and 5 when tested according to 7.7, line (a) in figure 3 a) shall be reproduced.
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6 Sampling
6.1 Sampling
Material selected for testing shall be from one batch and shall not be tested beyond its "Use Before" date [8.2.1 g)].
Powder from broken or damaged containers shall not be used for testing.
6.2 Test conditions
All mixing and testing of the dental gypsum product shall be carried out at (23 – 2) °C and (50 – 10) % relative
humidity. All apparatus and instruments used in mixing and testing shall be clean, dry and free from particles of
gypsum. Before testing begins, material and test apparatus shall be held for at least 15 h at the test temperature.
6.3 Mixing method
Mix by one of the methods (hand or mechanical) specified by the manufacturer in the instructions [8.3 b)], using
water which meets the requirements of ISO 3696.
7 Test methods
7.1 Inspection
Determine compliance with the requirements given in 5.1, 5.5 and 5.7 by visual inspection (without magnification,
unless as stated in 7.7).
7.2 Fluidity at pouring time for Type 1 materials
7.2.1 Apparatus
7.2.1.1 Cylindrical mould, clean and dry, having a length of (50,0 ± 0,1) mm and an inside diameter of
(35,0 ± 0,1) mm constructed from a corrosion-resistant, non-absorbent material.
7.2.1.2 Glass plate, clean, dry and smooth, with sides of length at least 100 mm.
7.2.1.3 Means of measuring the major and minor diameters of the slumped mix to the nearest millimetre, such as
a micrometer caliper.
7.2.2 Procedure
Rest the glass plate (7.2.1.2) on a surface that is free of vibration. Place the mould (7.2.1.1) upright on the centre of
the plate. Add (100 ± 0,1) g of the sample to the manufacturer’s recommended quantity of water and mix as
described in 6.3. Completely fill the mould and level off the mixed material so that it is flush with the top of the
mould. At 1,25 min after the start of mixing, lift the mould vertically from the plate at a rate of approximately 10 mm/s
and allow the mix to slump or spread over the plate. One minute after the mould is lifted, measure the major and
minor axes of the slumped material to the nearest millimetre. Record the average of these two diameters as the
fluidity at pouring time.
7.2.3 Evaluation
Carry out the test two times. If both average values meet the requirements for fluidity at pouring time listed in 5.2,
then the material meets the requirement for fluidity of this International Standard. If neither meets the requirement
listed in table 1, then the material fails to meet the requirement. If one average value meets the requirement for
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fluidity and the other fails, carry out three more tests. If all three of these average values meet the requirement for
fluidity (5.2), then the material meets the requirement for fluidity of this International Standard. Otherwise it fails.
7.3 Setting time
7.3.1 Apparatus
7.3.1.1 Vicat needle apparatus, an example of which is shown in figure 1, meeting the following requirements:
a) Vicat needle (C), 50 mm long, of circular cross-section and with a diameter of (1 6 0,05) mm.
b) Rod (B), of approximate dimensions 270 mm long and 10 mm in diameter.
c) Total mass of the rod and needle (A, B and C in figure 1) shall be (300 6 1) g.
d) Scale (D), graduated in millimetres.
e) Baseplate (H) of plate glass, measuring about 100 mm × 100 mm.
7.3.1.2 Clean, dry conical ring mould, constructed from a corrosion-resistant, nonabsorbent material, having an
inside diameter of 70 mm at the top and 60 mm at the base, and a height of 40 mm.
7.3.2 Procedure
Add 400 g of the sample to the manufacturer's recommended quantity of distilled water and mix as described in 6.3.
Fill the mould (7.3.1.2) completely and level the specimen flush with the top of the mould. Using the Vicat needle
apparatus (7.3.1.1) and beginning 1 min or 2 min prior to the anticipated setting time (usually at the loss of gloss or
excess water), allow the needle to penetrate the mix at (15 – 1) s intervals as follows.
a) Move the mould to allow the next penetration to be in a new area which is at least 5 mm from the mould wall
and from any other penetration mark.
b) Wipe the
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