EN ISO 17304:2013

SLOVENSKI STANDARD
01-februar-2014
Zobozdravstvo - Polimerizacijsko zmanjšanje: metoda za ugotavljanje
polimerizacijskega zmanjšanja obnovitvenih materialov na osnovi polimerov (ISO
17304:2013)
Dentistry - Polymerization shrinkage: Method for determination of polymerization
shrinkage of polymer-based restorative materials (ISO 17304:2013)
Zahnheilkunde - Polymerisationsschrumpfung: Verfahren zur Bestimmung der
Polymerisationsschrumpfung von polymerbasierenden Restaurationsmaterialien (ISO
17304:2013)
Médecine bucco-dentaire - Retrait de la polymérisation: méthode de détermination du
retrait de la polymérisation des matériaux de remplissage en polymères (ISO
17304:2013)
Ta slovenski standard je istoveten z: EN ISO 17304:2013
ICS:
11.060.10 =RERWHKQLþQLPDWHULDOL Dental materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 17304
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2013
ICS 11.060.10
English Version
Dentistry - Polymerization shrinkage: Method for determination
of polymerization shrinkage of polymer-based restorative
materials (ISO 17304:2013)
Médecine bucco-dentaire - Rétraction à la polymérisation: Zahnheilkunde - Polymerisationsschrumpfung: Verfahren
Méthode de détermination de la rétraction à la zur Bestimmung der Polymerisationsschrumpfung von
polymérisation des matériaux de restauration à base de polymerbasierenden Restaurationsmaterialien (ISO
polymères (ISO 17304:2013) 17304:2013)
This European Standard was approved by CEN on 2 November 2013.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17304:2013 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 17304:2013) has been prepared by Technical Committee ISO/TC 106 “Dentistry” in
collaboration with Technical Committee CEN/TC 55 “Dentistry” the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2014, and conflicting national standards shall be withdrawn at
the latest by June 2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 17304:2013 has been approved by CEN as EN ISO 17304:2013 without any modification.

INTERNATIONAL ISO
STANDARD 17304
First edition
2013-12-01
Dentistry — Polymerization
shrinkage: Method for determination
of polymerization shrinkage of
polymer-based restorative materials
Médecine bucco-dentaire — Rétraction à la polymérisation: Méthode
de détermination de la rétraction à la polymérisation des matériaux
de restauration à base de polymères
Reference number
ISO 17304:2013(E)
©
ISO 2013
ISO 17304:2013(E)
© ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
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Published in Switzerland
ii © ISO 2013 – All rights reserved

ISO 17304:2013(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test method . 1
4.1 Principle . 1
4.2 General . 2
4.3 Materials and reagents . 3
4.4 Apparatus . 4
4.5 Buoyancy medium. 4
4.6 Preparatory treatment of the test material . 5
4.7 Determination of polymerization shrinkage . 6
4.8 Test report .12
ISO 17304:2013(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received. www.iso.org/patents.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
The committee responsible for this document is ISO/TC 106, Dentistry, Subcommittee SC 1, Filling and
restorative materials.
iv © ISO 2013 – All rights reserved

ISO 17304:2013(E)
Introduction
This International Standard specifies a test method for the determination of the polymerization
shrinkage of external energy-activated polymer-based restorative materials of Class 2, Group 1 (see
ISO 4049) and similar core materials.
Many test methods have been used over many years to determine this property but no International
Standard test has so far been adopted. The method specified herein is a simple method that provides
reproducible results that will aid users in the comparison of test data. It was developed and verified by
a comprehensive interlaboratory test programme comparing it with other methods.
INTERNATIONAL STANDARD ISO 17304:2013(E)
Dentistry — Polymerization shrinkage: Method for
determination of polymerization shrinkage of polymer-
based restorative materials
1 Scope
This International Standard specifies a test method for the measurement of the polymerization
shrinkage of external energy-activated polymer-based restorative materials such as composites and
core materials.
The method is not suitable for Class 1 (self-curing, see ISO 4049) polymer-based restorative materials.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion
method, liquid pyknometer method and titration method
ISO 1942, Dentistry — Vocabulary
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods
ISO 4049, Dentistry — Polymer-based restorative materials
ISO 10650 (all parts), Dentistry — Powered polymerization activators
3 Terms and definitions
For the purposes of this document, the terms and definitions in ISO 1183-1, ISO 1942, ISO 4049, and the
following apply.
3.1
high-viscosity materials
polymer-based restorative materials having little flow so that they hold their shape on moulding
3.2
flowable materials
polymer-based restorative materials having low viscosity so that they do not hold their shape on moulding
4 Test method
4.1 Principle
The polymerization shrinkage of external energy-activated polymer-based restorative materials is
determined using density determinations in accordance with the buoyancy method (Archimedes’ principle).
This test method accords with method A (immersion method), described in general terms in ISO 1183-1.
Ensure that test conditions such as temperature, duration of exposure, and distance between light guide
and the test specimen are controlled and reproducible. Pre-test storage conditions of the polymer prior
to its measurement are also specified to ensure the maximum achievable polymerization in the test
ISO 17304:2013(E)
conditions so that the most complete possible shrinkage of the materials will be achieved. This way,
differences in the rate of polymerization will, to a large extent, be balanced out.
4.2 General
Perform all measurements at a room temperature of (23 ± 2) °C.
Store all specimens at a temperature of (23 ± 2) °C for at least 30 min before the start of measurement.
Perform all measurements of the unpolymerized specimens under yellow light.
1)
NOTE 1 Yellow light may be created by filtering ambient lighting with a suitable filter .
When handling test materials, wear appropriate rubber gloves, e.g. latex or nitrile.
The temperature fluctuation during the measurement of the unpolymerized specimens and the
polymerized specimens shall be less than 1,0 °C.
NOTE 2 Measurements can be performed at temperatures between 21 °C and 25 °C. Temperature variations
during measurement below 1,0 °C do not significantly influence the results.
Perform the corresponding density measurements for the unpolymerized and the polymerized
specimens on the same day.
1) Details of suitable products are available from the secretariat of ISO/TC 106.
2 © ISO 2013 – All rights reserved

ISO 17304:2013(E)
Key
1 position 1: for the specimen in air (dry)
2 position 2: for the specimen in the buoyancy medium
Figure 1 — Example of a density determination apparatus
4.3 Materials and reagents
4.3.1 General reagent — water, use water prepared in accordance with ISO 3696 Grade 3.
4.3.2 Sodium lauryl sulphate, with at least 99,0 % (mass concentration) purity.
NOTE The CAS number of sodium lauryl sulphate is 151–21–3.
ISO 17304:2013(E)
4.3.3 Test material — External-energy activated polymer-based restorative material or polymeric
core material.
4.4 Apparatus
4.4.1 Analytical balance, accurate to 0,000 1 g.
4.4.2 Density determination apparatus, consisting essentially of a platform, beaker, pan hanger
assembly, and thermometer (see Figure 1).
NOTE This equipment may be obtained from scale manufacturers as a special accessory (density
determination kit).
4.4.3 Thermometer, accurate in the range 20 °C to 30 °C, graduated in steps of 0,1 °C.
4.4.4 External energy source, with a radiant exitance of at least 500 mW/cm in the range of 400 nm
to 515 nm [determined in accordance with ISO 10650 (all parts)] and recommended by the manufacturer
of the test material for use with that material.
4.4.5 Vacuum pump, with pressure gauge (manometer), accurate to 10 mbar.
4.4.6 Desiccator, with a valve and capable of being connected to the vacuum pump (4.4.5)
4.4.7 Oven, capable of being maintained at (37 ± 2) °C.
4.4.8 Spatula.
4.4.9 Transfer medium, suitable for the unpolymerized paste, e.g. microscope slide.
4.4.10 Volumetric flask, of size 500 ml, with stopper.
4.4.11 Smooth, non-absorbent, stable base, e.g. mixing (conditioner) block.
4.4.12 Glass dish, for use with flowable materials, fitting to the measurement pans of the determination
a
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