Dentistry - Hydrocolloid impression materials (ISO 21563:2021)

Zahnheilkunde - Hydrokolloidabformmaterialien (ISO 21563:2021)

Dieses Dokument legt Anforderungen und Prüfverfahren fest, mit denen ermittelt werden kann, ob die in der Zahnheilkunde verwendeten elastischen Agar- und Alginat-Hydrokolloidabformmaterialien auf Wasserbasis, so wie sie im Einzelhandel verkauft werden, über die Qualität verfügen, die für ihre Anwendung benötigt wird. Sie enthält auch Anforderungen an die Kennzeichnung und an die Gebrauchsanweisung.
ANMERKUNG In diesem Dokument werden keine besonderen qualitativen und quantitativen Anforderungen zum Ausschluss biologischer Risiken gestellt. Zur Beurteilung möglicher biologischer Risiken, die mit der Verwendung von Hydrokolloidabformmaterial verbunden sind, wird empfohlen, ISO 7405 und ISO 10993 heranzuziehen.

Médecine bucco-dentaire - Produits pour empreintes à base d'hydrocolloïdes (ISO 21563:2021)

Zobozdravstvo - Hidrokoloidni materiali za oblikovanje (odtise) (ISO 21563:2021)

General Information

Status
Published
Public Enquiry End Date
19-Apr-2020
Publication Date
15-Nov-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Oct-2021
Due Date
18-Dec-2021
Completion Date
16-Nov-2021

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SLOVENSKI STANDARD
SIST EN ISO 21563:2021
01-december-2021
Nadomešča:
SIST EN ISO 21563:2013
Zobozdravstvo - Hidrokoloidni materiali za oblikovanje (odtise) (ISO 21563:2021)
Dentistry - Hydrocolloid impression materials (ISO 21563:2021)
Zahnheilkunde - Hydrokolloidabformmaterialien (ISO 21563:2021)
Médecine bucco-dentaire - Produits pour empreintes à base d'hydrocolloïdes (ISO
21563:2021)
Ta slovenski standard je istoveten z: EN ISO 21563:2021
ICS:
11.060.10 Zobotehnični materiali Dental materials
SIST EN ISO 21563:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 21563:2021
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SIST EN ISO 21563:2021
EN ISO 21563
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2021
EUROPÄISCHE NORM
ICS 11.060.10 Supersedes EN ISO 21563:2013
English Version
Dentistry - Hydrocolloid impression materials (ISO
21563:2021)

Médecine bucco-dentaire - Produits pour empreintes à Zahnheilkunde - Hydrokolloidabformmaterialien (ISO

base d'hydrocolloïdes (ISO 21563:2021) 21563:2021)
This European Standard was approved by CEN on 3 August 2021.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21563:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 21563:2021
EN ISO 21563:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 21563:2021
EN ISO 21563:2021 (E)
European foreword

This document (EN ISO 21563:2021) 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 March 2022, and conflicting national standards shall

be withdrawn at the latest by March 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 21563:2013.

Any feedback and questions on this document should be directed to the users’ national standards

body/national committee. A complete listing of these bodies can be found on the CEN websites.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 21563:2021 has been approved by CEN as EN ISO 21563:2021 without any modification.

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SIST EN ISO 21563:2021
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SIST EN ISO 21563:2021
INTERNATIONAL ISO
STANDARD 21563
Second edition
2021-08
Dentistry — Hydrocolloid impression
materials
Médecine bucco-dentaire — Produits pour empreintes à base
d'hydrocolloïdes
Reference number
ISO 21563:2021(E)
ISO 2021
---------------------- Page: 7 ----------------------
SIST EN ISO 21563:2021
ISO 21563:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 21563:2021
ISO 21563:2021(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Classification of agar hydrocolloid impression materials ......................................................................................... 3

5 Requirements — Characteristics and properties ............................................................................................................... 4

6 Pre-test planning approaches ................................................................................................................................................................. 5

6.1 General ........................................................................................................................................................................................................... 5

6.2 Sampling ....................................................................................................................................................................................................... 5

6.3 Pre-test product examinations .................................................................................................................................................. 5

6.3.1 General...................................................................................................................................................................................... 5

6.3.2 Examinations for compliance with labelling requirements ....................................................... 5

6.3.3 Examinations for effectiveness of the packaging ................................................................................. 5

6.3.4 Examinations for compliance with requirements for instructions for use ................... 6

6.4 Essential pre-test preparatory practices .......................................................................................................................... 6

6.4.1 Laboratory conditions ................................................................................................................................................. 6

6.4.2 Apparatus function verification steps ........................................................................................................... 6

6.4.3 Test material handling and use ........................................................................................................................... 6

6.4.4 Simulated oral time/temperature treatment of specimens formed in

completely closed moulds........................................................................................................................................ 7

6.4.5 Order of conducting tests ......................................................................................................................................... 7

6.4.6 Test schedules timing .................................................................................................................................................. 7

6.4.7 Pass/fail determinations ........................................................................................................................................... 7

6.4.8 Expression of test results ......................................................................................................................................... 8

7 Test methods ............................................................................................................................................................................................................. 8

7.1 General ........................................................................................................................................................................................................... 8

7.2 Working time test (alginate materials only) .................................................................................................................. 8

7.2.1 Apparatus and materials (the array of devices or materials used or

available for an undertaking) .................. .............................................................................................................. 8

7.2.2 Specimen preparation ................................................................................................................................................. 8

7.2.3 Test procedure ................................................................................................................................................................... 9

7.2.4 Pass/fail determinations/and expression of results ........................................................................ 9

7.3 Initial setting time test (alginate impression materials only) ........................................................................ 9

7.3.1 Apparatus ............................................................................................................................................................................... 9

7.3.2 Specimen preparation ................................................................................................................................................. 9

7.3.3 Test procedure ................................................................................................................................................................... 9

7.3.4 Pass/fail determinations and expression of results .......................................................................10

7.4 Detail reproduction test before and after specimen disinfection ............................................................10

7.4.1 Apparatus and materials ........................................................................................................................................10

7.4.2 Examination and conditioning of equipment and accessories .............................................10

7.4.3 Specimen preparation ..............................................................................................................................................10

7.4.4 Test procedure steps .................................................................................................................................................12

7.4.5 Pass/fail determination and expression of results..........................................................................12

7.5 Compatibility with gypsum test ............................................................................................................................................12

7.5.1 Apparatus and materials ........................................................................................................................................12

7.5.2 Specimen preparation ..............................................................................................................................................13

7.5.3 Test procedure ................................................................................................................................................................14

7.5.4 Pass/fail determination and expression of results..........................................................................14

7.6 Elastic recovery test.........................................................................................................................................................................14

7.6.1 Apparatus and materials ........................................................................................................................................14

7.6.2 Specimen preparation ..............................................................................................................................................14

7.6.3 Test procedure ................................................................................................................................................................15

© ISO 2021 – All rights reserved iii
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SIST EN ISO 21563:2021
ISO 21563:2021(E)

7.6.4 Calculation of results .................................................................................................................................................16

7.6.5 Pass/fail determinations and expression of results .......................................................................16

7.7 Strain-in-compression test ........................................................................................................................................................16

7.7.1 Apparatus and materials ........................................................................................................................................16

7.7.2 Specimen preparation ..............................................................................................................................................16

7.7.3 Test procedure ................................................................................................................................................................16

7.7.4 Calculation of results .................................................................................................................................................17

7.7.5 Pass/fail determinations and expression of results .......................................................................17

7.8 Tear strength test ...............................................................................................................................................................................17

7.8.1 Apparatus and materials ........................................................................................................................................17

7.8.2 Specimen preparation ..............................................................................................................................................18

7.8.3 Test procedure ................................................................................................................................................................19

7.8.4 Calculation of results .................................................................................................................................................19

7.8.5 Pass/fail determinations and expression of results .......................................................................19

7.9 Linear dimensional change test (Type 3A agar materials with companion alginate only) 20

7.9.1 Apparatus and materials ........................................................................................................................................20

7.9.2 Specimen preparation ..............................................................................................................................................20

7.9.3 Test procedure ................................................................................................................................................................21

7.9.4 Calculation of results .................................................................................................................................................21

7.9.5 Pass and fail determinations and expression of results ..............................................................21

7.10 Tensile bond strength test (Type 3A agar/companion alginate material specimen only) .21

7.10.1 Apparatus ............................................................................................................................................................................21

7.10.2 Specimen preparation ..............................................................................................................................................22

7.10.3 Specimen preparation steps ...............................................................................................................................22

7.10.4 Test procedure steps .................................................................................................................................................23

7.10.5 Calculation of results .................................................................................................................................................23

7.10.6 Pass/fail determination and expression of results..........................................................................23

8 Requirements — Labelling and instructions for use ...................................................................................................23

8.1 Labelling ....................................................................................................................................................................................................23

8.2 Requirements — Instructions for use ..............................................................................................................................24

8.2.1 General...................................................................................................................................................................................24

8.2.2 For all hydrocolloid impression materials covered by this document —

Agar and alginate ..........................................................................................................................................................24

8.2.3 Additional instructions for agar hydrocolloid impression materials only ..................25

8.2.4 Additional instructions for alginate hydrocolloid materials only ......................................25

Annex A (informative) Figures illustrating instruments and accessories used in tests...............................27

Annex B (informative) Tear test specimen preparation steps for an optional gripping method .......41

Bibliography .............................................................................................................................................................................................................................46

iv © ISO 2021 – All rights reserved
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SIST EN ISO 21563:2021
ISO 21563:2021(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 (see 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 (see 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.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee SC 2,

Prosthodontic materials, in collaboration with the European Committee for Standardization (CEN)

Technical Committee CEN/TC 55, Dentistry, in accordance with the Agreement on technical cooperation

between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 21563:2013), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— The detail reproduction before and after disinfection for alginate powder and paste/paste materials

has been corrected to be 50 microns.

— The elastic recovery test has been modified to allow for the use of poly(methyl methacrylate) plates

as an alternative to glass or metal.
— Figures A.2, A.3, A.4, and A.6 have been corrected.
— Multiple editorial changes have been made throughout the document.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
© ISO 2021 – All rights reserved v
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SIST EN ISO 21563:2021
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SIST EN ISO 21563:2021
INTERNATIONAL STANDARD ISO 21563:2021(E)
Dentistry — Hydrocolloid impression materials
1 Scope

This document specifies the requirements and test methods for hydrocolloid impression materials. This

document helps to determine whether elastic aqueous agar and alginate hydrocolloid dental impression

materials, as prepared for retail marketing, are of the quality needed for their intended purposes. It also

specifies requirements for labelling and instructions for use. This document does not address possible

biological hazards associated with the materials. Assessment of these hazards is addressed in ISO 7405

and the ISO 10993 series.
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 this document. 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 3696, Water for analytical laboratory use — Specification and test methods
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1942 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
bonding

adherence of the impression (3.6) material components in a single impression after each of the

interfacing materials has reached the level of effective setting required for successful removal from the

mouth
3.2
bulk container

labelled packaging holding a greater amount of otherwise unpackaged granular, liquid, powder, or other

loose substance than is usually needed for a single dental clinical or laboratory procedure

3.3
consumer packaging
retail packaging
sales packaging

packaging constituting, with its contents, a sales unit to the final user or consumer at the point of retail

[SOURCE: ISO 21067-1:2016, 2.2.7, modified — "retail packaging" and "sales packaging" have been

changed from preferred terms to admitted terms.]
© ISO 2021 – All rights reserved 1
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SIST EN ISO 21563:2021
ISO 21563:2021(E)
3.4
elastic recovery
elastic properties required to recover adequately from deformation
3.5
extrusion

process of obtaining a liquefied Type 3 or Type 3A agar impression (3.6) material from the containing

cartridge or syringe
3.6
impression

negative copy of oral or craniofacial tissue surfaces obtained by placing a mouldable impression

material into contact with the tissue surfaces, and allowing it to harden, or to become elastic, such

that the entire impression material/tray assembly can be removed from the contact without significant

harm to the tissues or to the assembly

Note 1 to entry: A properly formed impression is capable of having a relatively fluid model (cast) forming material

poured against the intaglio surface so that, when the modelling material sets, a positive copy of the impressed

surfaces is formed.
3.7
initial setting time

time, measured from commencement of mixing components of a material, or otherwise activating the

chemistry involved, and ending at a time when results of a prescribed test show that the activated

material has begun to set at a rate indicating that the effective setting time will be reached at some

predictable time thereafter

Note 1 to entry: Initial setting times stated in the manufacturer’s instructions are useful to test operators, users

and standards developers because they can be helpful:

— in determining whether quality of a product has deteriorated before or after opening of the packaging; for

example, if the initial setting time found by the test operator or user corresponds closely to that stated in the

manufacturer’s instructions, it can be assumed that the product is of a quality suitable for testing or use;

— in the development of standards for certain materials when there is a need for a standard to identify a

reference point in time that can be used as a basis for specifying a later point in time at which a subsequently

specified procedure can safely begin.
3.8
liquefaction

process of heating an agar impression (3.6) or duplicating material to change it from the elastic gel state

to the mouldable or pourable sol state
3.9
non-reversible impression material

impression (3.6) material which, having been brought to the effective setting stage as required for

removal from the mouth, cannot be returned to the mouldable state required for forming impressions

3.10
primary packaging
primary container
DEPRECATED: immediate container
packaging designed to come into direct contact with the product

[SOURCE: ISO 21067-1:2016, 2.2.3, modified — The admitted term "primary container" and the

deprecated term "immediate container" have been added.]
2 © ISO 2021 – All rights reserved
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SIST EN ISO 21563:2021
ISO 21563:2021(E)
3.11
reversible impression material

impression (3.6) material such as an agar hydrocolloid which, after having been brought to the gel state

for marketing purposes, can be heated so as to bring it to the relatively fluid colloid or paste-like state

required for making an impression

Note 1 to entry: Whereas in past years the “gel to sol” and “sol to gel” reversibility capacities of such impression

materials have allowed them to be recycled for repeated uses, modern infection control practices now discourage

user recycling of the reversible impression materials for repeated uses in the mouth.

3.12
secondary packaging
DEPRECATED: over packaging
packa
...

SLOVENSKI STANDARD
oSIST prEN ISO 21563:2020
01-junij-2020
Zobozdravstvo - Hidrokoloidni materiali za oblikovanje (odtise) (ISO/DIS
21563:2020)
Dentistry - Hydrocolloid impression materials (ISO/DIS 21563:2020)
Zahnheilkunde - Hydrokolloidabformmaterialien (ISO/DIS 21563:2020)

Médecine bucco-dentaire - Produits pour empreintes à base d'hydrocolloïdes (ISO/DIS

21563:2020)
Ta slovenski standard je istoveten z: prEN ISO 21563
ICS:
11.060.10 Zobotehnični materiali Dental materials
oSIST prEN ISO 21563:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 21563:2020
---------------------- Page: 2 ----------------------
oSIST prEN ISO 21563:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 21563
ISO/TC 106/SC 2 Secretariat: ANSI
Voting begins on: Voting terminates on:
2020-04-06 2020-06-29
Dentistry — Hydrocolloid impression materials
Médecine bucco-dentaire — Produits pour empreintes à base d'hydrocolloïdes
ICS: 11.060.10
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 21563:2020(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2020
---------------------- Page: 3 ----------------------
oSIST prEN ISO 21563:2020
ISO/DIS 21563:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 21563:2020
ISO/DIS 21563:2020(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Classification of agar hydrocolloid impression materials ......................................................................................... 3

5 Requirements — Characteristics and properties ............................................................................................................... 4

6 Pre-test planning approaches ................................................................................................................................................................. 4

6.1 Sampling ....................................................................................................................................................................................................... 5

6.2 Pre-test product examinations .................................................................................................................................................. 5

6.2.1 Examinations for compliance with labelling requirements ....................................................... 5

6.2.2 Examinations for effectiveness of the packaging ................................................................................. 5

6.2.3 Examinations for compliance with requirements for instructions for use ................... 5

6.3 Essential pre-test preparatory practices .......................................................................................................................... 6

6.3.1 Laboratory conditions ................................................................................................................................................. 6

6.3.2 Apparatus function verification steps ........................................................................................................... 6

6.3.3 Test material handling and use ........................................................................................................................... 6

6.3.4 Simulated oral time/temperature treatment of specimens formed in

completely closed moulds........................................................................................................................................ 7

6.3.5 Order of conducting tests ......................................................................................................................................... 7

6.3.6 Test schedules timing .................................................................................................................................................. 7

6.3.7 Pass/fail determinations ........................................................................................................................................... 7

6.3.8 Expression of test results ......................................................................................................................................... 7

7 Test methods ............................................................................................................................................................................................................. 8

7.1 Working time test (alginate materials only) .................................................................................................................. 8

7.2 Initial setting time test (alginate impression materials only) ........................................................................ 9

7.2.1 Apparatus ............................................................................................................................................................................... 9

7.2.2 Specimen preparation ................................................................................................................................................. 9

7.2.3 Test procedure ................................................................................................................................................................... 9

7.2.4 Pass/fail determinations and expression of results .......................................................................... 9

7.3 Detail reproduction test before and after specimen disinfection ............................................................... 9

7.3.1 Apparatus and materials ........................................................................................................................................... 9

7.3.2 Examination and conditioning of equipment and accessories .............................................10

7.3.3 Specimen preparation ..............................................................................................................................................10

7.3.4 Test procedure steps .................................................................................................................................................12

7.3.5 Pass/fail determination and expression of results..........................................................................12

7.4 Compatibility with gypsum test ............................................................................................................................................12

7.4.1 Apparatus and materials ........................................................................................................................................12

7.4.2 Specimen preparation ..............................................................................................................................................13

7.4.3 Test procedure ................................................................................................................................................................13

7.4.4 Pass/fail determination and expression of results..........................................................................13

7.5 Elastic recovery test.........................................................................................................................................................................13

7.5.1 Apparatus and materials ........................................................................................................................................13

7.5.2 Specimen preparation ..............................................................................................................................................14

7.5.3 Test procedure ................................................................................................................................................................15

7.5.4 Calculation of results .................................................................................................................................................15

7.5.5 Pass/fail determinations and expression of results .......................................................................15

7.6 Strain-in-compression test ........................................................................................................................................................16

7.6.1 Apparatus and materials ........................................................................................................................................16

7.6.2 Specimen preparation ..............................................................................................................................................16

7.6.3 Test procedure ................................................................................................................................................................16

7.6.4 Calculation of results .................................................................................................................................................16

© ISO 2020 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 21563:2020
ISO/DIS 21563:2020(E)

7.6.5 Pass/fail determinations and expression of results .......................................................................17

7.7 Tear strength test ...............................................................................................................................................................................17

7.7.1 Apparatus and materials ........................................................................................................................................17

7.7.2 Specimen preparation ..............................................................................................................................................18

7.7.3 Test procedure ................................................................................................................................................................19

7.7.4 Calculation of results .................................................................................................................................................19

7.7.5 Pass/fail determinations and expression of results .......................................................................19

7.8 Linear dimensional change test (Type 3A agar materials with companion alginate only) 19

7.8.1 Apparatus and materials ........................................................................................................................................19

7.8.2 Specimen preparation ..............................................................................................................................................20

7.8.3 Test procedure ................................................................................................................................................................20

7.8.4 Calculation of results .................................................................................................................................................21

7.8.5 Pass and fail determinations and expression of results ..............................................................21

7.9 Tensile bond strength test (Type 3A agar/companion alginate material specimen only) .21

7.9.1 Apparatus ............................................................................................................................................................................21

7.9.2 Specimen preparation ..............................................................................................................................................21

7.9.3 Specimen preparation steps ...............................................................................................................................22

7.9.4 Test procedure steps .................................................................................................................................................22

7.9.5 Calculation of results .................................................................................................................................................23

7.9.6 Pass/fail determination and expression of results..........................................................................23

8 Requirements — Labelling and instructions for use ...................................................................................................23

8.1 Labelling ....................................................................................................................................................................................................23

8.2 Requirements — Instructions for use ..............................................................................................................................24

8.2.1 For all hydrocolloid impression materials covered by this International

Standard — Agar and alginate ..........................................................................................................................24

8.2.2 Additional instructions for agar hydrocolloid impression materials only ..................24

8.2.3 Additional instructions for alginate hydrocolloid materials only ......................................25

Annex A (normative) Figures illustrating instruments and accessories used in tests ..................................26

Annex B (informative) Tear test specimen preparation steps for an optional gripping method .......39

Bibliography .............................................................................................................................................................................................................................44

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oSIST prEN ISO 21563:2020
ISO/DIS 21563:2020(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. 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.

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.

ISO 21563 was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee SC 2,

Prosthodontic materials.

This second edition cancels and replaces the first edition, which has been technically revised. The

following changes were made:

— The detail reproduction before and after disinfection for alginate powder and paste/paste materials

was corrected to be 50 microns.

— The elastic recovery test was modified to allow for the use of poly(methyl methacrylate) plates as

an alternative to glass or metal.

— Figures A.2, A.3, A.4, and A.6 were corrected and multiple editorial changes were made throughout

the document.
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oSIST prEN ISO 21563:2020
ISO/DIS 21563:2020(E)
Introduction

Parties seeking clarification of any provisions of this International Standard, or desiring to recommend

improvements for the next edition, are encouraged to do so by contacting ISO/TC 106, Dentistry, whose

address can be obtained through inquiry to the national standards body representing the interests of

the inquiring parties.
vi © ISO 2020 – All rights reserved
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oSIST prEN ISO 21563:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 21563:2020(E)
Dentistry — Hydrocolloid impression materials
1 Scope

This document specifies the requirements and tests for helping determine whether the elastic aqueous

agar and alginate hydrocolloid dental impression materials, as prepared for retail marketing, are of the

quality needed for their intended purposes. It also specifies requirements for labelling and instructions

for use.

NOTE This document specifies no requirements or tests for freedom from unacceptable biological hazards.

However, it is recommended that, to address possible biological hazards associated with the use of hydrocolloid

impression materials, interested parties should refer to ISO 7405 and ISO 10993.
2 Normative references

The following referenced documents are indispensable for application of this document. 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 3696, Water for analytical laboratory use — Specification and test methods
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1942 and the following apply.

3.1
bonding

adherence of the reversible and non-reversible impression material components constituting a single

impression after each of the separate but interfacing materials has reached the level of elasticity and

effective setting required for successful removal from the mouth
3.2
bulk container

labelled consumer packaging or primary packaging container holding a greater amount of otherwise

unpackaged granular, liquid, powder, or other loose substance than is usually needed for a single dental

clinical or laboratory procedure
3.3
combined reversible/non-reversible impression material system

system of impression making in which a light bodied agar material is first syringed around selected

teeth so that it can bond with the non-reversible alginate material that will be forced over it later during

the formation of an impression
3.4
consumer packaging
retail packaging
sales packaging

packaging constituting, with its contents, a sales unit to the final user or consumer at the point of retail

[SOURCE: ISO 21067:2007, definition 2.2.5]
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3.5
elastic recovery
elastic properties required to recover adequately from deformation
3.6
extrusion temperature

temperature at which a liquefied Type 3 or Type 3A agar impression material is extruded from the

containing cartridge or syringe onto any oral cavity tissue
3.7
impression

negative copy of oral or craniofacial tissue surfaces obtained by impressing a mouldable impression

material, usually contained in an impression tray, or injected into contact with the tissue surfaces, and

allowing it to harden, or to become elastic, such that the entire impression material/tray assembly can

be removed from the contact without significant harm to the tissues or to the assembly

Note 1 to entry: A properly formed impression is capable of having a relatively fluid model (cast) forming material

poured against the intaglio surface so that, when the modelling material sets, a positive copy of the impressed

surfaces is formed.
3.8
initial setting time

time, measured from commencement of mixing components of a material, or otherwise activating the

chemistry involved, and ending at a time when results of a prescribed test show that the activated

material has begun to set at a rate indicating that the effective setting time will be reached at some

predictable time thereafter

Note 1 to entry: Initial setting times stated in the manufacturer’s instructions are useful to test operators, users

and standards developers because they can be helpful:

— in determining whether quality of a product has deteriorated before or after opening of the packaging; for

example, if the initial setting time found by the test operator or user corresponds closely to that stated in the

manufacturer’s instructions, it can be assumed that the product is of a quality suitable for testing or use;

— in the development of standards for certain materials when there is a need for a standard to identify a

reference point in time that can be used as a basis for specifying a later point in time at which a subsequently

specified procedure can safely begin.

EXAMPLE It is reasonable to expect that the effective setting times for certain types of gypsum product

mixtures will have been reached within 45 min after the initial setting times previously recorded for the mixes.

3.9
liquefaction

process of heating an agar impression or duplicating material to change it from the elastic gel state to

the mouldable or pourable sol state
3.10
non-reversible impression material

any impression material which, having been brought to the effective setting stage as required for

removal from the mouth, cannot be returned to the mouldable state required for forming impressions

3.11
primary packaging
primary container
immediate container (deprecated)
packaging designed to be in direct contact with the product
Note 1 to entry: Adapted from ISO 21067:2007, definition 2.2.2.
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oSIST prEN ISO 21563:2020
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3.12
reversible impression material

impression material such as an agar hydrocolloid which, after having been brought to the gel state for

marketing purposes, can be heated so as to bring it to the relatively fluid colloid or paste-like state

required for making an impression

Note 1 to entry: Whereas in past years the “gel to sol” and “sol to gel” reversibility capacities of such impression

materials has allowed them to be recycled for repeated uses, modern infection control practices now discourage

user recycling of the reversible impression materials for repeated uses in the mouth.

3.13
secondary packaging
over packaging (deprecated)

packaging designed to contain one or more primary packagings together with any protective materials,

accessory devices that may have to be provided for use with the product
Note 1 to entry: Adapted from ISO 21067:2007, definition 2.2.3.
3.14
storing

process of holding increments of liquefied reversible agar hydrocolloid impression material at a reduced

temperature pending time they will be injected or tempered for impression making purposes

3.15
strain in compression

flexibility/stiffness property ranges of materials so as to determine whether the set materials, when

formed as impressions, can be removed from the mouth without injury to impressed oral tissues and

will have adequate stiffness in the more flexible portions of impressions to resist deformation when

model-forming products are poured against them
3.16
tempering

process of holding a heavy or medium bodied agar impression material in a slightly higher than mouth

temperature water bath, after the material has been placed into an impression tray, so as to further

reduce the sol state temperature as necessary for safe and effective seating in the mouth

3.17
unit packet

packaging containing only the amount of product usually needed for a single dental clinical or laboratory

application
4 Classification of agar hydrocolloid impression materials

The agar impression materials are classified according to the consistencies they exhibit while they are

ready for impressing against the oral or craniofacial tissue surfaces, and when tested according to 5.1.

Type 1 Heavy bodied, for making impressions of complete or partial dental arches, with or without

the use of companion increments of lighter bodied Type 2 or Type 3 agar impression materials.

Type 2 Medium bodied, for making impressions of complete and partial dental arches, with or without

the use of companion syringe-extruded increments of Type 3 agar materials.

Type 3 Light bodied, for syringe use with either the Type 1 or Type 2 agar materials.

Type 3A Light bodied, material formulated for syringe use in a reversible/non-reversible impression

material system, and that has been claimed to be capable of bonding to a companion alginate impression

material that will make up the greater part of an agar/alginate impression material system.

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oSIST prEN ISO 21563:2020
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5 Requirements — Characteristics and properties

The requirements applicable to only one category of hydrocolloid impression materials (agar or

alginate) are stated immediately below in 5.1 to 5.5. The requirements applicable to both categories are

displayed in Table 1 which constitutes a part of Clause 5.
5.1 Consistency (agar impression materials of all Types, in the sol state only)

After being exposed to the recommended storing temperature treatment recommended in the

manufacturer’s instructions, the material shall have a consistency that will allow the entire content of

the tube or syringes to be extruded within 30 s. No specimens need to be made but material shall be

tested to see if all can be extruded within 30s.
5.2 Working time (alginate materials only)

When tested in accordance with 7.1, the thickness of the layer of material remaining between the tip of

the test penetrator and the test base plate shall not exceed 0,25 mm.
5.3 Initial setting time (alginate materials only)

When tested in accordance with 7.2, the initial setting time shall be within 20 % of that stated in the

manufacturer’s instructions [8.2.3 h)]
5.4 Linear dimensional change (Type 3A agar materials only)

When tested in accordance with 7.8, the dimensional change shall not exceed 1,0 %

5.5 Tensile bond strength (Type 3A agar materials only)

When tested in accordance with 7.9, the minimum tensile bond strength shall not be less than 50 kPa

Table 1 — Other requirements for properties — Agar and alginate materials
Agar materials
Test Alginate powder
subclause Test procedure and paste/paste
Type 1 and Type 3 and
number materials
Type 2 Type 3A
7.3 Detail reproduction before and after disin- 20 20 50
fection
Line width reproduced (µm)
7.4 Compatibility with gypsum 50 50 50
Line width reproduced (µm)
7.5 Elastic recovery 96,5 96,5 95,0
% (min.)
7.6 Strain-in-compression 4,0 to 15,0 4,0 to 15,0 5,0 to 20,0
% Range: min. to max.
7.7 Tear strength 0,75 0,50 0,38
N/mm (min.)
6 Pre-test planning approaches

The information included in this clause is provided to help test operators avoid losses of time due to

trial and error efforts occurring when such information is not taken into account before test procedures

such as those described in Clause 7 are begun.
4 © ISO 2020 – All rights reserved
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