EN ISO 9917-1:2025

SLOVENSKI STANDARD
01-november-2025
Nadomešča:
SIST EN ISO 9917-1:2008
Zobozdravstvo - Cementi na osnovi vode - 1. del: Cementi, ki se vežejo na osnovi
kislinsko-bazne reakcije (ISO 9917-1:2025)
Dentistry - Water-based cements - Part 1: Acid-base cements (ISO 9917-1:2025)
Zahnheilkunde - Wasserhärtende Zemente - Teil 1: Zemente, die beim Vermischen von
Pulver und Flüssigkeit über eine Säure-Base-Reaktion abbinden (ISO 9917-1:2025)
Médecine bucco-dentaire - Ciments à base d’eau - Partie 1: Ciments acido-basiques
(ISO 9917-1:2025)
Ta slovenski standard je istoveten z: EN ISO 9917-1:2025
ICS:
11.060.10 Zobotehnični materiali Dental materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 9917-1
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2025
EUROPÄISCHE NORM
ICS 11.060.10 Supersedes EN ISO 9917-1:2007
English Version
Dentistry - Water-based cements - Part 1: Acid-base
cements (ISO 9917-1:2025)
Médecine bucco-dentaire - Ciments à base d'eau - Zahnheilkunde - Wasserhärtende Zemente - Teil 1:
Partie 1: Ciments acido-basiques (ISO 9917-1:2025) Zemente, die beim Vermischen von Pulver und
Flüssigkeit über eine Säure-Base-Reaktion abbinden
(ISO 9917-1:2025)
This European Standard was approved by CEN on 11 May 2025.

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, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9917-1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 9917-1:2025) 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 December 2025, and conflicting national standards
shall be withdrawn at the latest by December 2025.
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 9917-1:2007.
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 website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 9917-1:2025 has been approved by CEN as EN ISO 9917-1:2025 without any
modification.
International
Standard
ISO 9917-1
Third edition
Dentistry — Water-based
2025-05
cements —
Part 1:
Acid-base cements
Médecine bucco-dentaire — Ciments à base d’eau —
Partie 1: Ciments acido-basiques
Reference number
ISO 9917-1:2025(en) © ISO 2025

ISO 9917-1:2025(en)
© ISO 2025
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 9917-1:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 2
4.1 Chemical type .2
4.2 Application .2
5 Material. 3
5.1 General .3
5.2 Components .3
5.2.1 Liquid .3
5.2.2 Powder .3
5.3 Unset cement .3
6 Preparation of test specimens . 3
6.1 Ambient conditions.3
6.2 Method of mixing.3
7 Sampling . 3
7.1 Hand-mixed cements .3
7.2 Encapsulated cements .3
8 Requirements . 4
8.1 General .4
8.2 Net setting time (except pit and fissure sealing cements) .4
8.3 Film thickness (luting cements only) .4
8.4 Compressive strength .4
8.5 Acid erosion .4
8.6 Optical properties (polyalkenoate restorative cements only) .4
8.7 Acid-soluble arsenic and lead contents .4
8.7.1 Acid-soluble arsenic content .4
8.7.2 Acid-soluble lead content .4
8.8 Radiopacity (if claimed) .4
8.9 Net setting time (pit and fissure sealing cements only) .5
9 Packaging, marking, labelling and information to be supplied by manufacturer . 5
9.1 General .5
9.2 Packaging .5
9.3 Declaration of components .8
Annex A (normative) Determination of net setting time (except for pit and fissure sealing
cements) . 9
Annex B (informative) Chemical composition and applications of dental cements .11
Annex C (normative) Determination of film thickness (luting cements only) .12
Annex D (normative) Determination of compressive strength .15
Annex E (normative) Determination of acid erosion .18
Annex F (normative) Determination of optical properties (polyalkenoate restorative cements
only) .21
Annex G (normative) Determination of acid-soluble arsenic and lead contents .24
Annex H (normative) Determination of radiopacity (if claimed) .25
Annex I (normative) Determination of net setting time (pit and fissure sealing cements only) .27
Bibliography .29

iii
ISO 9917-1:2025(en)
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 1, Filling and
restorative 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 third edition cancels and replaces the second edition (ISO 9917-1:2007), which has been technically
revised.
The main changes are as follows:
— change of the title;
— inclusion of pit and fissure sealing cements in the scope;
— adoption of ISO 13116 test method for radiopacity;
— adoption of table-type formatting of requirements of marking and information;
— addition of declaration of components;
— addition of Annex I.
A list of all parts of the ISO 9917 series can be found on the ISO website.
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.

iv
ISO 9917-1:2025(en)
Introduction
This document specifies the requirements and test methods for cements in which setting is achieved by an
acid-base reaction.
This document does not include specific qualitative and quantitative requirements for ensuring the absence
of biological hazards. It is recommended that reference be made to ISO 10993-1 and ISO 7405 when assessing
possible biological or toxicological hazards.

v
International Standard ISO 9917-1:2025(en)
Dentistry — Water-based cements —
Part 1:
Acid-base cements
1 Scope
This document specifies requirements and test methods for acid-base, dental cements intended for permanent
cementation, lining and restoration. This document is not intended to address resin-modified water-based
cements. This document is applicable to both hand-mixed and encapsulated cements for mechanical mixing.
This document specifies limits for each of the properties according to whether the cement is intended for
use as a luting agent, base or liner, restorative material or pit and fissure sealing cement.
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
1)
ISO 2590, General method for the determination of arsenic — Silver diethyldithiocarbamate photometric method
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 7491, Dental materials — Determination of colour stability
ISO 8601-1, Date and time — Representations for information interchange — Part 1: Basic rules
ISO 13116, Dentistry — Test method for determining radio-opacity of materials
ISO 15223-1, Medical devices — Symbols to be used with information to be supplied by the manufacturer — Part
1: General requirements
ISO 20417, Medical devices — Information to be supplied by the manufacturer
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 https:// www .electropedia .org/
1) Withdrawn.
ISO 9917-1:2025(en)
3.1
mixing time
time measured from first contact between the components of a material, required to achieve a homogeneous
mixture of the components when they have been stored, proportioned and mixed according to the
manufacturer’s instructions
[SOURCE: ISO 1942:2020, 3.3.1.36]
3.2
working time
period of time measured from the commencement of mixing the components of a material or otherwise
activating the chemistry of the material and ending before the material has developed properties that
prevent it from being manipulated as required to achieve its purpose in a subsequent procedure or in its
intended end function
[SOURCE: ISO 1942:2020, 3.3.3.22]
3.3
net setting time
period of time from the end of mixing until the material has set according to the criteria and conditions
specified in Annex A and Annex I
Note 1 to entry: For the purposes of this document, in view of the wide variation in mixing times of cements, the net
setting time is determined from the end of mixing.
3.4
encapsulated cements
acid-base cements packaged as a unit dose whose packaging includes the powder and the liquid for mixing at
the time of use by some mechanical means other than hand apportioning
Note 1 to entry: The alternative to an encapsulated cement is a hand-mixed cement.
4 Classification
4.1 Chemical type
For the purposes of this document, acid-base cements shall be classified on the basis of their chemical
composition as follows:
a) zinc phosphate cements, see Clause B.1;
b) zinc polycarboxylate cements, see Clause B.2;
c) glass polyalkenoate cements, see Clause B.3.
Acid-base reaction setting, water-based cements other than those listed above can fall within the scope of
this document. A manufacturer shall specify whether their product shall conform to the specifications for
list items a), b) or c) and 4.2.
NOTE Materials that do not involve an acid-base reaction (e.g., “calcium silicate-based cement”) are not covered
by this document.
4.2 Application
For the purposes of this document, the applications of water-based cements shall be classified as follows:
a) luting agent;
b) bases or liner;
c) restorative material;
ISO 9917-1:2025(en)
d) pit and fissure sealing cement.
5 Material
5.1 General
The cement shall consist of a powder and liquid which, when mixed in accordance with the manufacturer’s
instructions, shall conform to requirements in this clause and Clause 8.
5.2 Components
5.2.1 Liquid
For non-encapsulated cements, visually inspect the liquid. It shall be free from deposits or filaments on the
inside of its container. There shall be no visible signs of gelation, i.e. no formation of insoluble or solid matter.
5.2.2 Powder
For non-encapsulated cements, visually inspect the powder. It shall be free from extraneous material. If the
powder is coloured, the pigment shall be uniformly dispersed throughout the powder.
5.3 Unset cement
The cement shall be mixed in accordance with Clause 6, and then visually inspected. It shall be homogeneous
and of a smooth consistency.
6 Preparation of test specimens
6.1 Ambient conditions
Specimens shall be prepared at (23 ± 1) °C and a relative humidity of (50 ± 10) %.
6.2 Method of mixing
The cement shall be prepared in accordance with the manufacturer’s instructions. Sufficient cement shall
be mixed to ensure that the preparation of each specimen is completed from one mix. A fresh mix shall be
prepared for each specimen.
NOTE For encapsulated cements, more than one capsule simultaneously mixed can be required for certain
specimens.
7 Sampling
7.1 Hand-mixed cements
A sample drawn from one batch shall provide sufficient material to complete all the prescribed tests and any
necessary repeats.
NOTE Approximately 50 g of powder can be necessary to complete the tests.
7.2 Encapsulated cements
The test sample shall comprise a retail package of enough capsules from one batch to complete all the tests
and any necessary repeats.
ISO 9917-1:2025(en)
8 Requirements
8.1 General
Calibrate all critical apparatus in accordance with the general requirements for the competence of testing
and calibration laboratories; see ISO/IEC 17025.
8.2 Net setting time (except pit and fissure sealing cements)
Net setting time shall be determined in accordance with Annex A and in accordance with the relevant
requirements specified in Table 1.
8.3 Film thickness (luting cements only)
Film thickness shall be determined in accordance with Annex C and in accordance with the relevant
requirements specified in Table 1.
8.4 Compressive strength
Compressive strength shall be determined in accordance with Annex D and in accordance with the relevant
requirements specified in Table 1.
8.5 Acid erosion
Acid erosion shall be determined in accordance with Annex E and in accordance with the relevant
requirements specified in Table 1.
8.6 Optical properties (polyalkenoate restorative cements only)
Opacity and colour shall be determined in accordance with Annex F and shall meet the following
requirements:
a) The opacity of the set restorative cements shall be within the limits specified in Table 1, unless the
restorative cement is designated as opaque by the manufacturer (see Table 2, item 13).
b) The colour of the set cement shall match the manufacturer’s shade guide. If the manufacturer does not
provide a shade guide, the manufacturer shall nominate a commercially available shade guide that shall
be used in assessing conformity with this requirement (see Table 2, item 12).
8.7 Acid-soluble arsenic and lead contents
8.7.1 Acid-soluble arsenic content
Acid-soluble arsenic content shall be determined in accordance with Annex G and in accordance with the
relevant requirements specified in Table 1.
8.7.2 Acid-soluble lead content
Acid-soluble lead content shall be determined in accordance with Annex G and in accordance with the
relevant requirements specified in Table 1.
8.8 Radiopacity (if claimed)
When the manufacturer describes the material as being radio-opaque (see Table 2, item 14), the radiopacity
shall be determined in accordance with Clause H.5, list item a) and shall be at least equivalent to that for the
same thickness of aluminium. When the manufacturer claims a greater radiopacity (see Table 2, item 15),

ISO 9917-1:2025(en)
the measured value shall not be less than the value claimed when determined in accordance with Clause H.5,
list item b).
8.9 Net setting time (pit and fissure sealing cements only)
Net setting time shall be determined in accordance with Annex I and in accordance with the relevant
requirements specified in Table 1.
Table 1 — Requirements for acid-base cements
Film Com- Acid Acid-sol- Acid-sol-
Net setting
thick- pressive ero- uble As uble Pb
Opacity
time
ness strength sion content content
C
Application Chemical type
0,70
µm minutes MPa mm mg/kg mg/kg
max. min. max. min. max. min. max. max. max.
Zinc phosphate 25 2,5 8 50 0,30 ― ― 2 100
Luting Zinc polycarboxylate 25 2,5 8 50 0,40 ― ― 2 100
a
Glass polyalkenoate 25 1,5 8 50 0,17 ― ― ― 100
Zinc phosphate ― 2,0 6 50 0,30 ― ― 2 100
Base/lining Zinc polycarboxylate ― 2,0 6 50 0,40 ― ― 2 100
a
Glass polyalkenoate ― 1,5 6 50 0,17 ― ― ― 100
a
Restoration Glass polyalkenoate ― 1,5 6 100 0,17 0,35 0,90 ― 100
Pit and fissure ― 1,5 6 50 0,17 ― ― ―
a
Glass polyalkenoate 5
sealing
a
Synonymous with “glass-ionomer”.
9 Packaging, marking, labelling and information to be supplied by manufacturer
9.1 General
Information shall be clearly marked on the outermost packaging or containers (for multi-dose packs), as
indicated in Table 2 and conform to ISO 20417.
Visually inspect to verify the requirements in Table 2.
NOTE 1 Additional information to that specified in Table 2 can be supplied at the discretion of the manufacturer or
as required by regulation.
NOTE 2 Table 2 contains optional items and serves as a guide to the manufacturer as to the type of information
which can be useful to clinicians.
9.2 Packaging
a) The cements shall be supplied in containers or capsules that afford adequate protection and have no
adverse effect on the quality of the contents.
b) For the purposes of this document, a container or capsule shall be considered to be the immediate
packaging of the cements.
c) The outermost packaging contains the material, the instructions for use and any proportioning or
mixing devices that are supplied for the material.
d) An outer pack may also be used to present the containers or capsules as a single unit.

ISO 9917-1:2025(en)
Table 2 — Requirements for marking and instructions for use
Outer
pack of
Outer- Manufacturer’s
capsule(s) Capsule
Items of marking and instructions for use most pack- instructions for
/ multiple (single dose)
aging use
dose con-
tainer
The trade name, type and application of the ce-
1 M M NA M
ment
Either the manufacturer’s name or trademark, or
2 M M OPT M
both.
3 The manufacturer’s name and contact details M OPT NA M
The manufacturer’s internet address (URL), if one
exists, is optional. However, where instructions
for use are provided on a medium other than
paper, the manufacturer should ensure the user
4 OPT OPT NA OPT
has information on how to: view the instructions
for use; access the correct version of the instruc-
tions for use; and obtain a paper version of the
instructions for use.
5 The recommended conditions of storage M OPT NA M
6 The manufacturer’s batch or lot number M M OPT NA
The expiry date, expressed in accordance with ISO
8601-1, for the material if stored under the manu-
facturer’s recommended conditions
7 M M OPT NA
Graphical symbols in accordance with ISO 15223-
1, if applicable, to avoid confusion of sizes or kits
8 The chemical type of the cement (see 4.1) M OPT OPT M
9 The clinical application (see 4.2) OPT OPT NA M
If the product is an encapsulated type, the number
10 M M NA NA
c
of capsules in the outer pack
The minimum net mass, in g, of the powder or
11 the minimum net volume, in ml, of the liquid as OPT M OPT OPT
appropriate
M
The shade of the powder according to
12 OPT M OPT (shade guide or
the manufacturer’s nominated shade guide
designation of it)
a
13 Whether the cement is designated as opaque M M OPT M
14 Whether the cement is designated as radio-opaque OPT OPT OPT M
If a specific claim on the extent of radiopacity
15 is made, the equivalent thickness of aluminium OPT OPT NA M
claimed for 1 mm thickness of the cement (see 8.8)
Key
M mandatory
OPT optional
NA not applicable
a
Opaque designation can be included in the shade.
b
For hand-mixed cements only.
c
For encapsulated cements only.

ISO 9917-1:2025(en)
TTabablele 2 2 ((ccoonnttiinnueuedd))
Outer
pack of
Outer- Manufacturer’s
capsule(s) Capsule
Items of marking and instructions for use most pack- instructions for
/ multiple (single dose)
aging use
dose con-
tainer
The recommended powder-to-liquid ratio, ex-
pressed as a mass-to-mass ratio for the recom-
mended temperature range, and an indication of
how the user may achieve this ratio
16 OPT OPT NA M
[for test purposes, the powder-to-liquid ratio on
a mass-to-mass basis to a precision of 0,01 g at
(23 ± 2) °C and a relative humidity of (50 ± 10) %
b
shall be included]
The rate of incorporation of the powder into the
17 OPT OPT NA M
b
liquid
18 The mixing time (see 3.1) OPT OPT NA M
The type of the mixing slab and spatula and their
19 OPT OPT NA M
b
condition
The method of bringing about physical contact
20 OPT OPT NA M
c
between the powder and liquid
The type of mechanical mixing device and the
21 OPT OPT NA M
c
mixing time to be employed
22 The working time (see 3.2) OPT OPT NA M
23 The net setting time (see 3.3) OPT OPT NA M
If appropriate, a statement recommending that a
24 liner should be placed between the cement and the NA NA NA OPT
dentine
The minimum deliverable volume, in ml, of mixed
25 OPT OPT NA M
c
cement in one capsule
If appropriate, the minimum time at which finish-
26 OPT OPT NA OPT
ing of a restorative may be commenced
If appropriate, the recommended method of finish-
27 OPT OPT NA OPT
ing of a restorative
If appropriate, a statement indicating that the
surface of the restorative shall be coated with a
28 OPT OPT NA OPT
protective coating and guidance on the type of
coating to be used
When necessary, special indications or warnings
in respect of properties like toxicity, hazard, flam-
29 OPT OPT OPT M
mability or tissue irritancy, for both patient and
operator
30 Date of issue of the instructions NA NA NA M
Key
M mandatory
OPT optional
NA not applicable
a
Opaque designation can be included in the shade.
b
For hand-mixed cements only.
c
For encapsulated cements only.

ISO 9917-1:2025(en)
9.3 Declaration of components
The manufacturer shall provide, either in the instructions for use or by means of a safety data sheet, the
composition and information on components present in the material ≥ 1 % by mass (irrespective of hazard
potential) and any ingredient that is classified as a carcinogen, mutagen or reproductive toxicant (CMR)
present in the material ≥ 0,1 % by mass.
The list shall include a chemical name or its common abbreviation, if available (e.g. bis-GMA, HEMA,
TEGDMA). The Chemical Abstracts Service registry number (CAS number) may be used.
Either the mass percentage range for each listed component or a listing in the order of mass from the highest
to the lowest concentration shall be provided.
NOTE CMR is defined in authoritative lists. See examples in References [4], [5], [6] and [7].
The manufacturer may include additional information at their discretion.

ISO 9917-1:2025(en)
Annex A
(normative)
Determination of net setting time (except for pit and fissure sealing
cements)
A.1 Apparatus
A.1.1 Cabinet, capable of being maintained at (37 ± 1) °C and a relative humidity of at least 90 %.
A.1.2 Indentor, of mass (400 ± 5) g, with a needle that has a flat end of diameter (1,0 ± 0,1) mm which is
plane and perpendicular to the long axis of the needle.
A.1.3 Metal mould, similar to that shown in Figure A.1. Internal corners may be square or round.
A.1.4 Metal block, of minimum dimensions 8 mm × 75 mm × 100 mm positioned within the cabinet and
maintained at (37 ± 1) °C.
A.1.5 Aluminium foil.
A.1.6 Timer, accurate to 1 s.
A.1.7 Magnifier, capable of ×2 magnification.
Dimensions in millimetres
Tolerance on dimensions:
Thickness: ±0,15
Length: ±1,0
Figure A.1 — Mould for preparation of specimens for determination of net setting time
A.2 Procedure
A.2.1 Preliminary measurement of approximate net setting time
1) Condition the metal block (A.1.4) and indentor (A.1.2) to (37 ± 1) °C.
2) Place the mould (A.1.3), conditioned to (23 ± 1) °C, on the aluminium foil (A.1.5).

ISO 9917-1:2025(en)
3) Mix the cement as required by the manufacturer’s instructions. When mixing is complete, start the
timer (A.1.6).
4) Fill the mould to a level surface with the mixed cement.
5) Sixty seconds after mixing is complete, place the assembly, comprising the mould, foil and cement, on
the block (A.1.4) in the cabinet (A.1.1), ensuring good contact between the mould, foil and block.
6) Ninety seconds after mixing is complete, carefully lower the indentor (A.1.2) vertically on to the surface
of the cement in the cabinet and allow it to remain there for 5 s.
7) Raise the indentor and inspect the indentation with the magnifier (A.1.7). Observe whether the
indentation is a complete circle. If the indentation is not a complete circle, the approximate net setting
time has been determined. If the indentation is a complete circle, close the cabinet and proceed. Clean
the needle, if necessary.
8) Repeat the indentations in the cabinet at 30 s intervals until the needle no longer makes a complete
circular indentation in the cement when viewed using ×2 magnification. Clean the needle, if necessary,
between indentations.
9) Record the approximate net setting time as the time elapsed between completion of mixing and the time
when the needle fails to make a complete circular indentation in the cement.
A.2.2 Determination of net setting time
1) Repeat steps A.2.1, 1) to 5) with a fresh sample and start the timer.
2) Thirty seconds before the approximate net setting time determined in A.2.1, 9), carefully lower the
indentor (A.1.2) vertically on to the surface of the cement in the cabinet and allow it to remain there for 5 s.
3) Raise the indentor and inspect the indentation with the magnifier (A.1.7). Observe whether the
indentation is a complete circle. If the indentation is not a complete circle, the net setting time has been
determined. If the indentation is a complete circle, close the cabinet and proceed. Clean the needle, if
necessary.
4) Repeat the indentations in the cabinet at 10 s intervals until the needle no longer makes a complete
circular indentation in the cement when viewed using ×2 magnification. Clean the needle, if necessary,
between indentations.
5) Record the net setting time as the time elapsed between completion of mixing and the time when the
needle fails to make a complete circular indentation in the cement.
6) Repeat the steps A.2.2, 1) to 5) with fresh cement samples two more times.
7) Record the average of these three tests of the net setting time to the nearest 10 s.
A.3 Treatment of results
Record the results of the three tests. Each result shall fall within the range specified in Table 1 for the
cements to meet the requirements of 8.2.

ISO 9917-1:2025(en)
Annex B
(informative)
Chemical composition and applications of dental cements
B.1 Zinc phosphate cements
Zinc phosphate cements are based on the reaction between an oxide powder (the principal constituent of
which is zinc oxide) and an aqueous solution of phosphoric acid which can contain other metal ions. They
can be used to cement dental appliances to hard oral structures or to other appliances. They can also be
used as bases for restorative materials and as temporary restorative materials.
B.2 Zinc polycarboxylate cements
Zinc polycarboxylate cements are based on the reaction between zinc oxide and aqueous solutions of
polyacrylic acid or similar polycarboxylic compounds, or zinc oxide/polycarboxylic acid powders which
are mixed with water. They can be used to cement dental appliances to hard oral structures or to other
appliances. They can also be used as a base for restorative materials and as a temporary restorative material.
B.3 Glass polyalkenoate cements
Glass polyalkenoate (glass ionomer) cements are based on the reaction between an aluminosilicate glass
powder and an aqueous solution of a polyalkenoic acid, or between an aluminosilicate glass/polyalkenoic
acid powder blend and water, or an aqueous solution of tartaric acid. These cements are used for aesthetic
restorations of teeth or as bases or liners for other restorations. They can also be used to cement dental
appliances to hard oral structures or to other appliances. This type also includes glass polyalkenoate
cements in which an aluminosilicate glass and a metal have been fused or mixed together and which are
intended for the restoration of teeth.

ISO 9917-1:2025(en)
Annex C
(normative)
Determination of film thickness (luting cements only)
C.1 Apparatus
C.1.1 Two optically flat, square or circular glass plates, which has a contact surface area
of (200 ± 25) mm . Each plate shall be of uniform thickness of not less than 5 mm.
C.1.2 Loading device, of the type illustrated in Figure C.1, or an equivalent means, whereby a force
of (150 ± 2) N may be generated vertically to the specimen via the upper glass plate.
The anvil, which is attached to the bottom of the rod carrying the load, shall be horizontal and parallel to
the base. The device shall be such that the force is applied smoothly and in such a manner that no rotation
occurs. The platen shall be flat and parallel, and normal to the load axis. A worn platen shall be replaced.
C.1.3 Screw micrometer or equivalent measuring instrument, which has graduations of 2 µm or less.

ISO 9917-1:2025(en)
Key
1 specimen
2 glass discs
3 anvil
4 platen
Figure C.1 — Loading device for use in film thickness test
C.2 Procedure
Measure and record to an accuracy of 1 µm the combined thickness of the two optically flat glass plates
(C.1.1) stacked in contact. Designate this measurement reading A. Remove the upper plate and place
(0,10 ± 0,05) ml of the mixed cement in the centre of the lower plate. Place this centrally below the loading
device (C.1.2) on the lower platen. Replace the second glass plate centrally on the cement in the same
orientation as in the original measurement.
Ten seconds before the end of the manufacturer’s stated working time, gently apply a force of (150 ± 2) N
vertically and centrally to the specimen via the top plate. Ensure that the cement fills the space between the
glass plates. When at least 10 min have elapsed after the application of the force, remove the plates from the
loading device and measure the combined thickness of the two glass plates and the cement film. Designate
this measurement reading B.
Record the difference in thickness of the plates with and without the cement film (reading B − reading A) as
the thickness of the film. Repeat the test four times.

ISO 9917-1:2025(en)
C.3 Treatment of results
At least four of the five results shall be below 25 µm for the cement to pass the requirement specified in
8.3 and Table 1. If only two or fewer results are below 25 µm, the cement shall fail the requirement. If three
results are below 25 µm, a further five specimens shall be tested. To meet the requirement specified in 8.3
and
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