EN ISO 10394:2024

Dentistry - Designation system for supernumerary teeth (ISO 10394:2023)

This document establishes a system for the designation of supernumerary teeth in humans using two alphanumeric characters.

Zahnheilkunde - Bezeichnungssystem für überzählige Zähne (ISO 10394:2023)

Médecine bucco-dentaire - Code de désignation des dents surnuméraires (ISO 10394:2023)

Le présent document établit un code de désignation des dents surnuméraires humaines utilisant deux caractères alphanumériques.

Zobozdravstvo - Sistem označb za nadštevilne zobe (ISO 10394:2023)

Ta dokument vzpostavlja sistem za označevanje nadštevilnih zob pri človeku z uporabo dveh alfanumeričnih znakov.

General Information

• Status: Published
• Publication Date: 19-Mar-2024
• ICS: 11.060.01 - Dentistry in general
• Technical Committee: CEN/TC 55 - Dentistry
• Drafting Committee: CEN/TC 55 - Dentistry
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 20-Mar-2024
• Due Date: 11-Nov-2025
• Completion Date: 20-Mar-2024
• Ref Project: SIST EN ISO 10394:2024 - Dentistry - Designation system for supernumerary teeth (ISO 10394:2023)

Overview

EN ISO 10394:2024 (identical to ISO 10394:2023) specifies a standardized, two-character designation system for supernumerary teeth in humans. The standard defines an alphanumeric code that locates extra (supernumerary) teeth relative to the normal dentition using a compact, computer-friendly format designed for clinical records, dental software and data exchange. It was adopted by CEN as EN ISO 10394:2024 to ensure consistent use across European national standards bodies.

Key topics and requirements

• Two-character format: Every supernumerary tooth is designated by two characters (one letter + one digit, or two letters for midline cases) to align with existing two-character systems.
• Quadrant identifier (first character):
  • A = quadrant 10 (upper right)
  • B = quadrant 20 (upper left)
  • C = quadrant 30 (lower left)
  • D = quadrant 40 (lower right)
• Tooth-location digit (second character): Digits 1–8 indicate position within a quadrant (e.g., 1 = central incisor area, 2 = lateral incisor area, …, 8 = third molar area). Table 1 in the standard maps these codes to normal tooth positions.
• Midline designations: Two-letter codes identify midline supernumeraries:
  • AB = midline of the maxilla (upper jaw)
  • DC = midline of the mandible (lower jaw)
• Location rules:
  • Designation relates the supernumerary tooth to the normal tooth at that site or immediately mesial to it.
  • If a supernumerary tooth overlaps more than one normal location, use the mesial-most extent for designation.
  • The system does not specify bucco‑lingual position and does not classify teeth as deciduous or permanent.
  • Multiple supernumerary teeth in the same location use the same code.
• Compatibility constraint: The system intentionally retains the two-character format and avoids redefining codes already used by ISO 3950 to preserve interoperability.

Applications and users

This dentistry standard supports consistent identification, reporting and data exchange for supernumerary teeth across clinical and technical environments:

• Dentists, orthodontists and oral surgeons for charting and treatment planning
• Dental radiologists for standardized radiographic reporting
• Electronic health record (EHR) and dental practice management software developers for coding and messaging
• Dental researchers and epidemiologists collecting prevalence and outcome data
• Standards bodies and terminologists aligning dental vocabularies Practical benefits include improved interoperability, clearer communication in referrals/records, and easier integration with existing tooth designation systems.

Related standards

• ISO 3950 - Designation system for teeth and areas of the oral cavity (related, but not extended for supernumeraries)
• ISO 1942 - Dentistry - Vocabulary (normative reference used in EN ISO 10394:2024)

Keywords: EN ISO 10394:2024, ISO 10394:2023, supernumerary teeth, designation system, dentistry standard, dental coding, tooth designation, dental interoperability.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2024
Zobozdravstvo - Sistem označb za nadštevilne zobe (ISO 10394:2023)
Dentistry - Designation system for supernumerary teeth (ISO 10394:2023)
Zahnheilkunde - Bezeichnungssystem für überzählige Zähne (ISO 10394:2023)
Médecine bucco-dentaire - Système de désignation des dents surnuméraires (ISO
10394:2023)
Ta slovenski standard je istoveten z: EN ISO 10394:2024
ICS:
11.060.01 Zobozdravstvo na splošno Dentistry in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 10394
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2024
EUROPÄISCHE NORM
ICS 11.060.01
English Version
Dentistry - Designation system for supernumerary teeth
(ISO 10394:2023)
Médecine bucco-dentaire - Code de désignation des Zahnheilkunde - Bezeichnungssystem für überzählige
dents surnuméraires (ISO 10394:2023) Zähne (ISO 10394:2023)
This European Standard was approved by CEN on 16 March 2024.

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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10394:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 10394:2023 has been prepared by Technical Committee ISO/TC 106 "Terminology” of
the International Organization for Standardization (ISO) and has been taken over as EN ISO 10394:2024
by 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 September 2024, and conflicting national standards
shall be withdrawn at the latest by September 2024.
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.
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 10394:2023 has been approved by CEN as EN ISO 10394:2024 without any modification.

INTERNATIONAL ISO
STANDARD 10394
First edition
2023-02
Dentistry — Designation system for
supernumerary teeth
Médecine bucco-dentaire — Système de désignation des dents
surnuméraires
Reference number
ISO 10394:2023(E)
ISO 10394:2023(E)
© ISO 2023
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 10394:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles . 1
5 Designation of supernumerary teeth . 1
5.1 Supernumerary teeth located within one of the four quadrants of the mouth . 1
5.1.1 First character . 1
5.1.2 Second character . 2
5.2 Supernumerary teeth located in the midline area . 2
Bibliography . 4
iii
ISO 10394:2023(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 Electr
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