SIST EN ISO 8325:2023/A1:2026
(Amendment)Dentistry - Test methods for rotary instruments - Amendment 1 (ISO 8325:2023/Amd 1:2026)
- Status
- Published
- Public Enquiry End Date
- 29-Jun-2025
- Publication Date
- 10-Jun-2026
- Technical Committee
- VAZ - Healthcare
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 28-May-2026
- Due Date
- 02-Aug-2026
- Completion Date
- 11-Jun-2026
SIST EN ISO 8325:2023/A1:2026 is the Slovenian adoption of the CEN amendment EN ISO 8325:2023/A1:2026, which modifies the dental standard for test methods for rotary instruments. It updates the procedures for shank measurement, run-out, and neck-strength calculation, so manufacturers and test laboratories can use the same method language and loading rules.
What does SIST EN ISO 8325:2023/A1:2026 specify?
SIST EN ISO 8325:2023/A1:2026 specifies amendments to EN ISO 8325:2023 for dentistry test methods for rotary instruments. The amendment keeps the base standard’s purpose but revises the terminology clause, two test-method clauses, and the bibliography.
| Part of the amendment | What it covers |
|---|---|
| Clause 3 | Terms and definitions used in the document |
| 5.5 | Dimensions of shanks |
| 5.11.3.1 | Load and repeat measurement for run-out |
| 5.11.4 | Test-force calculation for neck strength and its limit |
| Bibliography | Adds ISO 7711-1 |
The document is organised as front matter, a European foreword, the amendment body, and a bibliography entry.
What are the key requirements of SIST EN ISO 8325:2023/A1:2026?
SIST EN ISO 8325:2023/A1:2026 changes the testing instructions in ways that affect how instruments are measured and loaded in practice. The most important points are below.
Clause 3 links the terminology to ISO 1797, ISO 1942 and ISO 21850-1. In practice, users should interpret the test method with the same terms and definitions as those standards, so results are comparable across labs and product specifications.
Clause 5.5 revises how to determine shank dimensions. The shank diameter is measured according to ISO 1797, and the shank length is measured from the end of the shank to the start of the neck or, if there is no neck, to the start of the working part. This matters because fit and gauge checks depend on where the shank is considered to begin and end.
Clause 5.5 also treats markings on the shank as part of the shank and fitting length when the diameter condition is met. The start of any enlargement, including a marking or the working head, has to be outside the fitting length. This helps avoid ambiguity when a marking changes the local diameter.
5.11.3.1 changes the load applied during the run-out-related test to 2 N for 5 s, and if the test piece does not break, run-out is measured again. In practice, this means the same specimen is checked after a defined conditioning load.
5.11.4 replaces the neck-strength force calculation. The test force is calculated from a formula using the minimum neck diameter behind the working part, and the k-factor comes from the relevant instrument standard. This ties the load to instrument geometry and material type instead of using one fixed force for every design.
5.11.4.2 limits the calculated test force to 60 N. This is important for very short instruments with large diameters, where the formula can produce forces that are mathematically correct but too high for practical testing.
The note under 5.11.4 points to Annex A of the base standard for the derivation of the formula and gives an example of a k-factor for diamond instruments. That helps users understand why the formula is structured the way it is.
What terms does SIST EN ISO 8325:2023/A1:2026 define?
SIST EN ISO 8325:2023/A1:2026 relies on terminology from ISO 1797, ISO 1942 and ISO 21850-1, and it uses the following key terms in its revised methods.
- Shank - the part whose diameter and length are checked in the revised clause 5.5.
- Fitting length - the portion of the shank relevant to fit, including certain markings when the diameter condition is met.
- Working part - the active part of the rotary instrument; it is used as the length reference when no neck is present.
- Run-out - the measured value that is checked again after the 2 N loading step.
- Minimum neck diameter - the narrowest diameter behind the working part, used in the neck-strength force calculation.
- k-factor - the shape-and-material constant used in the force formula and taken from the relevant instrument standard.
- Test force F - the force applied in the neck-strength test calculation.
Who uses SIST EN ISO 8325:2023/A1:2026?
SIST EN ISO 8325:2023/A1:2026 is used by manufacturers of dental rotary instruments, testing laboratories, and quality managers who need a common method for verifying geometry and strength. It is also relevant to conformity assessment and product specification work, especially when a company must document how shank dimensions, run-out and neck strength are checked.
The amendment is most relevant in the dental instruments sector, including design, routine quality control, type testing, and comparison of results between suppliers and laboratories.
What changed in SIST EN ISO 8325:2023/A1:2026 from the previous edition?
SIST EN ISO 8325:2023/A1:2026 is an amendment to EN ISO 8325:2023. The changes stated in the amendment are:
- Clause 3 is replaced to link the terminology to ISO 1797, ISO 1942 and ISO 21850-1.
- Clause 5.5 is replaced with revised rules for shank dimensions.
- 5.11.3.1 is replaced with a 2 N load applied for 5 s and a repeat run-out measurement if the specimen remains intact.
- 5.11.4 is replaced with a new neck-strength force calculation and a 60 N maximum.
- The Bibliography is extended with ISO 7711-1.
Which standards are used with SIST EN ISO 8325:2023/A1:2026?
The amendment names these related standards:
| Standard | Contribution |
|---|---|
| EN ISO 8325:2023 | Base standard modified by this amendment |
| ISO 1797 | Shank diameter method and terminology source |
| ISO 1942 | Terminology source for dental terms |
| ISO 21850-1 | Terminology source used in Clause 3 |
| ISO 7711-1 | Example source for the k-factor used for diamond instruments |
What does the SIST EN ISO 8325:2023/A1:2026 document contain?
SIST EN ISO 8325:2023/A1:2026 is a short amendment document that provides revised normative wording rather than a full test standard. Its content focuses on one formula for neck-strength testing, one loading step for the run-out-related test, and revised instructions for measuring shank geometry.
It also includes a bibliographic addition and a note that points users to Annex A of the base standard for the derivation of the force formula. For day-to-day use, the document tells a laboratory exactly where to measure, what load to apply, when to repeat a measurement, and how to cap the calculated test force.
Relations
- Effective Date
- 01-Jul-2026
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Frequently Asked Questions
SIST EN ISO 8325:2023/A1:2026 is a amendment published by the Slovenian Institute for Standardization (SIST). Its full title is "Dentistry - Test methods for rotary instruments - Amendment 1 (ISO 8325:2023/Amd 1:2026)". This standard covers: Dentistry - Test methods for rotary instruments - Amendment 1 (ISO 8325:2023/Amd 1:2026)
Dentistry - Test methods for rotary instruments - Amendment 1 (ISO 8325:2023/Amd 1:2026)
SIST EN ISO 8325:2023/A1:2026 is classified under the following ICS (International Classification for Standards) categories: 11.060.20 - Dental equipment; 11.060.25 - Dental instruments. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 8325:2023/A1:2026 has the following relationships with other standards: It is inter standard links to SIST EN ISO 8325:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN ISO 8325:2023/A1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2026
Zobozdravstvo - Preskusne metode za vrtilne instrumente - Dopolnilo A1 (ISO
8325:2023/Amd 1:2026)
Dentistry - Test methods for rotary instruments - Amendment 1 (ISO 8325:2023/Amd
1:2026)
Zahnheilkunde - Prüfverfahren für rotierende Instrumente - Änderung 1 (ISO
8325:2023/Amd 1:2026)
Médecine bucco-dentaire - Méthodes d'essai pour instruments rotatifs - Amendement 1
(ISO 8325:2023/Amd 1:2026)
Ta slovenski standard je istoveten z: EN ISO 8325:2023/A1:2026
ICS:
11.060.25 Zobotehnični instrumenti Dental instruments
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 8325:2023/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2026
EUROPÄISCHE NORM
ICS 11.060.20
English Version
Dentistry - Test methods for rotary instruments -
Amendment 1 (ISO 8325:2023/Amd 1:2026)
Médecine bucco-dentaire - Méthodes d'essai pour Zahnheilkunde - Prüfverfahren für rotierende
instruments rotatifs - Amendement 1 (ISO Instrumente - Änderung 1 (ISO 8325:2023/Amd
8325:2023/Amd 1:2026) 1:2026)
This amendment A1 modifies the European Standard EN ISO 8325:2023; it was approved by CEN on 25 April 2026.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant 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 amendment 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8325:2023/A1:2026 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 8325:2023/A1:2026) 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 Amendment to the European Standard EN ISO 8325:2023 shall be given the status of a national
standard, either by publication of an identical text or by endorsement, at the latest by November 2026,
and conflicting national standards shall be withdrawn at the latest by November 2026.
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.
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 8325:2023/Amd 1:2026 has been approved by CEN as EN ISO 8325:2023/A1:2026
without any modification.
International
Standard
ISO 8325
Third edition
Dentistry — Test methods for rotary
2023-03
instruments
AMENDMENT 1
AMENDMENT 1
2026-05
Médecine bucco-dentaire — Méthodes d'essai pour instruments
rotatifs
AMENDEMENT 1
Reference number
ISO 8325:2023/Amd.1:2026(en) © ISO 2026
ISO 8325:2023/Amd.1:2026(en)
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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or ISO’s member body in the country of the requester.
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