EN ISO 7493:2006

SLOVENSKI STANDARD
01-julij-2006
Zobozdravstvo - Zobozdravniški delovni stol (ISO 7493:2006)
Dentistry - Operator's stool (ISO 7493:2006)
Zahnheilkunde - Arbeitsstuhl (ISO 7493:2006)
Art dentaire - Siege d'opérateur (ISO 7493:2006)
Ta slovenski standard je istoveten z: EN ISO 7493:2006
ICS:
11.060.20
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 7493
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2006
ICS 11.060.20
English Version
Dentistry - Operator's stool (ISO 7493:2006)
Art dentaire - Siège d'opérateur (ISO 7493:2006) Zahnheilkunde - Arbeitsstuhl (ISO 7493:2006)
This European Standard was approved by CEN on 13 April 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
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Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7493:2006: E
worldwide for CEN national Members.

Foreword
This document (EN ISO 7493:2006) 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 November 2006, and conflicting national
standards shall be withdrawn at the latest by November 2006.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 7493:2006 has been approved by CEN as EN ISO 7493:2006 without any
modifications.
INTERNATIONAL ISO
STANDARD 7493
Third edition
2006-05-01
Dentistry — Operator's stool
Art dentaire — Siège d'opérateur

Reference number
ISO 7493:2006(E)
©
ISO 2006
ISO 7493:2006(E)
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ii © ISO 2006 – All rights reserved

ISO 7493:2006(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 7493 was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee SC 6, Dental
equipment.
This third edition cancels and replaces the second edition (ISO 7493:1997) and its Technical
Corrigendum 1:1999, which have been technically revised. The following changes were made:
a) The requirements for seat height and range of adjustment (see 4.2 in this edition) have been changed to
reflect ISO 7493:1997 Technical Corrigendum 1.
b) A requirement for sampling has been added (Clause 5).
c) The test procedure for the stability of the stool has been revised (see 6.5). Figure 1 has been revised to
reflect this change.
d) The test procedure for cleaning and disinfection has been revised (see 6.8).
e) References to ISO 6385 and ISO 11226 have been added to Annex A.
ISO 7493:2006(E)
Introduction
The objectives of this International Standard are to ensure that the design and functioning of the operator's
stool in the dental office will be such as to enable the dental operator to perform his or her work effectively and
safely, to minimize the muscular and skeletal stresses, particularly in shoulders and spine, that arise during
the performance of the work, and to allow freedom of movement without undue muscular activity.
iv © ISO 2006 – All rights reserved

INTERNATIONAL STANDARD ISO 7493:2006(E)

Dentistry — Operator's stool
1 Scope
This International Standard specifies requirements, recommendations and test methods for the operator’s
stool in the dental office as well as requirements for the manufacturer’s instructions for use and for marking
and packaging. It also covers recommendations to manufacturers on the design of operator's stools.
For purposes of this International Standard, the term “dental operator” includes dentists, dental assistants and
dental hygienists.
2 Normative references
The following referenced documents are indispensable for the 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.
1)
ISO 1942 , Dentistry — Vocabulary
ISO 8191-1, Furniture — Assessment of the ignitability of upholstered furniture — Part 1: Ignition source:
smouldering cigarette
ISO 9687, Dental equipment — Graphical symbols
ISO 21530, Dentistry — Materials used for dental equipment surfaces — Determination of resistance to
chemical disinfectants
3 Terms and definitions
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1942 and the following apply.
3.1.1
operator's stool
movable seat, adjustable in height, which satisfies the general requirements relevant to the performance of
dentistry by a seated operator
3.1.2
anterio-posterior plane
vertical plane which divides the operator’s stool into left and right halves
3.1.3
seat height
vertical distance between the floor and the point of intersection of the swivel axis with the plane of the loaded
surface or the unloaded surface of the seat

1) To be published. [Revision of ISO 1942 (all parts):1989.]
ISO 7493:2006(E)
3.1.4
seat width
horizontal dimension of the widest part of the seat between the upper edges of the sides of the seat,
measured perpendicularly to the anteroposterior plane of the seat
3.1.5
seat depth
horizontal dimension measured alongside the centre of the seat width in the anteroposterior plane of the seat
between the vertical projections of the front edge and the back edge of the seat
NOTE If the stool is provided with a backrest, the dimension is measured between the foremost projection of the
centreline of the backrest and the normal projection of the front edge of the seat.
3.1.6
backrest height
vertical distance between reference Point A and reference Point B, measured with the seat loaded and with an
unloaded backrest (in free-standing position)
For this measurement, it is necessary to adjust the backrest to its most forward position and, if it can be
pivoted upon a horizontal axis, to put it in the vertical position.
3.1.7
least favourable position of the operator's stool
position of the operator's stool at which the load-bearing part of the seat and two adjacent castors are placed
in their least favourable position with regard to the seat-tipping stability
3.2 Symbols
Figure 1 shows the following symbols:
h seat height for loaded surface;
h seat height for unloaded surface;
h backrest height;
c seat depth;
c seat depth, if a backrest is provided;
c seat width;
e horizontal d
...