SIST EN ISO 6872:2000
(Main)Dental ceramic (ISO 6872:1995)
Dental ceramic (ISO 6872:1995)
Migrated from Progress Sheet (TC Comment) (2000-07-10): UAP to be launched on ISO 6872:1995 + its amendment:1997 (Amd published on ++ 1997-12-01) TA/980318
Dentalkeramik (ISO 6872:1995)
In der vorliegenden Internationalen Norm werden die Anforderungen und die entsprechenden Prüfverfahren für dentalkeramische Massen, die zur Herstellung für alle festsitzenden keramischen Jacketkronen und Füllungen verwendet werden, festgelegt.
Céramique dentaire (ISO 6872:1995)
La CEI 60205:2006 établit des règles uniformes pour le calcul des paramètres effectifs des circuits fermés de matériaux ferromagnétiques.
Dental ceramic (ISO 6872:1995)
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 6872:2000
01-januar-2000
Dental ceramic (ISO 6872:1995)
Dental ceramic (ISO 6872:1995)
Dentalkeramik (ISO 6872:1995)
Céramique dentaire (ISO 6872:1995)
Ta slovenski standard je istoveten z: EN ISO 6872:1998
ICS:
11.060.10 =RERWHKQLþQLPDWHULDOL Dental materials
SIST EN ISO 6872:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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IS0
INTERNATIONAL
6872
STANDARD
Second edition
1995-09-01
Dental ceramic
Cbramique dentaire
Reference number
IS0 6872: 1995(E)
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IS0 6872:1995(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(I EC) 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 IS0 6872 was prepared by Technical Committee
lSO/TC 106, Dentistry, Subcommittee SC 2, Prosthodontic mater-i&.
This second edition cancels and replaces the first edition
(IS0 6872:1984), o f w h’ IC h ‘I t constitutes a technical revision.
0 IS0 1995
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.
lnternatronal Organization for Standardiza tion
1 Geneve 20 l
Case Postale 56 l CH-121 Switzerland
Printed in Switzerland
ii
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0 IS0 IS0 6872:1995(E)
Introduction
Specific qualitative and quantitative requirements of freedom from
biological hazard are not included in this International Standard but it is
recommended that, in assessing possible biological or toxicological haz-
ards, reference should be made to IS0 10993-I :I 992, Biological evaluation
of medical devices - Part 1: Guidance on selection of tests or to
lSO/TR 7405:1984, Biological evaluation of dental materials, or any more
recent edition.
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INTERNATIONAL STANDARD 0 IS0
IS0 6872:1995(E)
Dental ceramic
3.2 batch; lot: Defined quantity of starting material,
1 Scope
packaging material or product processed in one pro-
cess or series of processes so that it could be ex-
This International Standard specifies the requirements
petted to be homogeneous.
and the corresponding test methods for dental cer-
amic materials for all fixed ceramic restorations.
3.3 castable dental ceramic: Dental ceramic spe-
cially prepared to be cast using a lost wax process.
2 Normative references
3.4 class of dental ceramic: Classification of a
dental ceramic according to its intended use.
The following standards contain provisions which,
through reference in this text, constitute provisions
3.5 condensation of dental ceramic: Any process
of this International Standard. At the time of publi-
by which a dental ceramic is compacted before firing.
cation, the editions indicated were valid. All standards
are subject to revision, and parties to agreements
3.6 core dental ceramic: Dental ceramic which
based on this International Standard are encouraged
provides a supporting structure for building up a cer-
to investigate the possibility of applying the most re-
amic restoration.
cent editions of the standards indicated below.
Members of IEC and IS0 maintain registers of cur-
rently valid International Standards. 3.7 dental ceramic: Material specially prepared for
the fabrication of ceramic prostheses and resto-
IS0 3696:1987, Water for analytical laboratory use -
rations.
Specification and test methods.
3.8 dental ceramic stain: Highly pigmented dental
IS0 4799: 1978, Labora tory glass ware -
ceramic used for a ceramic restoration or prosthesis
Condensers.
to simulate details of colour and/or appearance of a
natural tooth.
3.9 dental dentine ceramic: Slightly translucent,
3 Definitions
pigmented dental ceramic used to give the overall
shape and basic colour of a dental ceramic restoration
For the purposes of this International Standard, the
or prosthesis.
following definitions apply.
3.1 air-fired dental ceramic: Dental ceramic fired 3.10 dental enamel ceramic: Translucent, lightly
under ambient atmospheric pressure. pigmented dental ceramic, for use on a core or a base
1
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IS0 6872: 1995(E)
of dentine ceramic to s imulate the natural tooth
5 Requirements
enamel.
5.1 Uniformity
3.11 glass-ceramic: Partly
crystalline product
whose final microstructure is obtained via the
The inorganic pigment(s) used to produce the colour
controlled crystallization of a glass.
of a fired dental ceramic and any dye(s) shall be uni-
formly dispersed throughout the dental ceramic ma-
3.12 glass-infiltrated dental ceramic: Initially
in powdered ceramic products, no
terial, and,
sintered, i.e. porous, dental ceramic, subsequently in-
segregation of the pigment(s) shall take place when
filtrated with glass.
the powder is mixed as in 8.1.3. Check by visual in-
spection (see ciause 7).
3.13 injectable dental ceramic: Type of dental cer-
amic specially prepared to be injected, in the fused
5.2 Freedom from extraneous materials
state, into a mould.
5.2.1 Dental ceramic materials, powdered as well as
3.14 medium glaze: Surface appearance obtained
non-powdered products, shall be free from ex-
when the glaze is clinically and aesthetically accept-
traneous materials, when assessed by visual in-
able.
spection (see clause 7).
3.15 modelling fluid: Liquid (other than water) with
5.2.2 Dental ceramic materials shall have a radioac-
which a dental ceramic may be intended to be mixed
tive emission of not more than 0,2 Bqmg- I. This value
prior to condensation.
does not include that of potassium-40. Test in ac-
cordance with 8.2.
3.16 sintering of ceramic: Act or process of heating
at a predetermined temperature a finely powdered
5.3 Mixing and condensation properties,
dental ceramic material, resulting in its densification
type I ceramics
and bonding.
When mixed as in 8.1.3 with water or the modelling
3.17 vacuum-fired dental ceramic: Dental ceramic
fluid recommended by the manufacturer, a dental
which is formulated to be fired at much less than at-
ceramic powder shall not form lumps or granules
mospheric pressure.
when assessed by visual inspection (see clause 7).
The paste so formed shall be suitable for making
jacket-crowns, and inlay and onlay restorations by
4 Types, classes and their identification
condensation of successive layers. When the paste is
condensed as in 8.1.4, it shall not crack or crumble,
Dental ceramics are designated in two types. Type I
when assessed by visual inspection (see clause 7)
includes ceramic products which are provided as a
during the drying cycle recommended by the manu-
powder: type II includes all other forms of ceramic
facturer.
product. Ceramics shall be divided into classes ac-
cording to their intended use. If a colour is added to
a ceramic powder in order to identify the class of the 5.4 Physical and chemical properties
powder, the colour coding given in table 1 is rec-
The physical and chemical properties of ceramic test
ommended.
specimens tested in accordance with the relevant
Type II, class 1 ceramics are used for the fabrication methods, detailed for the dissimilar types of ceramics
of the supporting structure for crowns, veneers, inlays in clause 8, shall comply with the requirements
and onlays, thus referring to materials which are in-
specified in table 2.
tended to be layered with material from one or more
of type I ceramics, classes 2 to 8. Type II, class 2
5.5 Biocompatibility
ceramics are used for the fabrication of veneers, in-
lays and onlays. See the Introduction for guidance on biocompatibility.
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IS0 6872:1995(E)
Table 1 - Colours for dental ceramic powders, type I
Colour coding
Class Material
-I-
--r
Yellow or none
Core ceramic
Pink
Dentinelbody ceramic
Blue
Enamel ceramic
Green
Neck material
Transparent material None
None
Stains
Add-on material None
Glaze material None
Table 2 - Physical and chemical properties
Requirement
I
Property
Type I class Type II class
1 2 to 5 6 to 8 1 2
Flexural strength, MPa, min. 100 50 100 30
in mass, pgcrn-* , max. 2 000 100 100 2 000 100
Chemical solubility: loss
8 Test methods
6 Sampling
6.1 Type I ceramics
8.1 Preparation of test specimens
Take a sufficient amount of ceramic to carry out the
necessary tests. Where there is more than one shade
For detailed instructions, see the individual test
in a class of dental ceramic, take equal quantities of
methods.
each shade.
For type I specimens and unless otherwise stated or
Sufficient quantities of essential modelling fluids shall
inconsistent with the text, the apparatus detailed in
be obtained, if their use is recommended by the
8.1.2 and 8.1.4.1, and the conditions for mixing,
manufacturers. The quantities shall be those rec-
condensation and firing apply to all test methods.
ommended by the manufacturer concerned. If the
shades of a class of ceramic comply with clause 4,
5.1 and 5.21, form a pool of powder of that material
8.1.1 Components of test specimens, type I
by taking samples of equal mass from each shade,
ceramics
using a core sampler or an apparatus of similar capa-
bility. The total mass of the pool of powder shall be
The liquid used in the preparation of test specimens
sufficient to carry out the necessary tests.
shall be water that complies with the requirements for
grade 3 water, IS0 3696 or, when applicable, the
modelling fluid recommended by the manufacturer of
6.2 Type II ceramics
the dental ceramic powder. The required amount of
powder shall be taken from the appropriate pool of
All of the material procured for testing in accordance
powder obtained in accordance with 6.1.
with this International Standard shall be of the same
lot .
8.1.2 Apparatus for mixing
7 Inspection
All apparatus for mixing shall be clean and dry.
Use visual inspection to assess compliance of each
sample, taken in accordance with clause 6, with
8.1.2.1 Glass slab or mixing palette.
clause 4, 5.1 I 5.2.1 and 5.3.
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IS0 6872:1995(E)
8.1.2.2 Spatula, made from a non-metallic material
8.1.4 Condensation
that is not readily abraded by the dental
ceramic
powder (glass is recommended). Instruments
used
8.1.4.1 Apparatus
for the mixing procedure shall be made of
materials
which do not contaminate the ceramic material.
8.1.4.1.1
Open multipart mould (figure 1 or 2) from
8.1.3 Method of mixing
which the condensed specimen may be removed
without distortion.
Combine the mixing liquid and the ceramic powder in
the proportions recommended by the manufacturer.
Avoid vigorous mixing which will tend to incorporate 8.1 .$.I .2 Vibration system (table or mechanical
air bubbles with the paste and, both during and after brush) with 50 Hz to 60 Hz frequency or in accord-
mixing, examine for compliance with 5.1 and 5.2.1.
ance with the manufacturer ’s instructions.
Dimensions in millimetres
I
’ B
--I
B-B
25 *-I
A-A
Figure 1 - Mould (25 mm x 5 mm x 2 mm) for use in flexural strength test
4
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IS0 6872:1995(E)
Dimensions in millimetres
A-A
Ii 1 Ii
‘I ’ ll
I
1
- ++ql~ 1 (!g@- -
\
7’ \
A’ A
A -,
I 9
8 I ,,,,, I7 0
‘I ’ ll hl
T f
II II
(’ ll
rl
B-B
B
c
Materials: PMMA sheet
PTFE rod
Brass or steel screws
Figure 2 -
Mould (16 mm diameter x I,6 mm) for use in chemical solubility test
8.1.4.2 Procedure
8.2 Radioactivity of dental ceramic
Over-fill the mould with dental ceramic paste, and vi-
brate. When excess liquid appears at the free surface
8.2.1 Preparation of samples
of the specimen, place a paper tissue (or similar ab-
sorbent material) on the surface of the specimen, and
8.2.1.1 Type I ceramics
remove the excess liquid continually by replacing the
tissue as soon as it becomes saturated with liquid.
A 50 g sampl
...
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