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I NTE R NAT I O NA L
STANDARD 77854
First edition
1992-1 2-1 5
Dental handpieces -
Part 1:
H i g h-s peed ai r-t urbi ne hand pieces
Pièces à main dentaires -
Partie 1: Pièces à main à turbines à air comprimé pour grandes vitesses
Reference number
IS0 7785-1:1992(E)
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IS0 7785-1 :1992(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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, govern-
mental and non-governmental, in liaison with ISO, also take part in the
work. IS0 collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Drafi International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an Inter-
national Standard requires approval by at least 75% of the member
bodies casting a vote.
International Standard IS0 7785-1 was prepared by Technical Committee
ISO/TC 106, Dentistry, Sub-Committee SC 4, Dental instruments.
IS0 7785 consists of the following parts, under the general title Dental
handpieces:
- Part 1: High-speed air-turbine handpieces
- Part 2: Straight and geared angle handpieces
0 IS0 1992
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without
permission In writing from the publisher.
International Organization for Standardization
Case Postale 56 CH-I211 Genève 20 Switzerland
Prlnted in Switzerland
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INTERNATIONAL STANDARD IS0 7785-1 :I 992(E)
Dental handpieces -
Part 1:
H ig h-s peed a i r-t u r bi ne ha nd pieces
1 Scope 3 Requirements
This part of IS0 7785 specifies requirements and test
3.1 Materials
methods for high-speed air-turbine dental hand-
pieces.
All materials used in the construction of the hand-
pieces should be suitable for their intended use and
should be resistant to cleaning, disinfecting and
sterilizing procedures recommended by the manu-
facturer.
Compliance with these requirements cannot be ob-
jectively assessed.
Testing shall be carried out in accordance with 4.1.
2 Normative references
If in addition the requirements of 3.5 to 3.12 are
complied with, the requirement of 3.1 is considered
The following standards contain provisions which,
to be fulfilled.
through reference in this text, constitute provisions
of this part of IS0 7785. At the time of publication,
3.2 Construction
the editions indicated were valid. All standards are
subject to revision, and parties to agreements based
The construction of the handpiece should provide for
on this part of IS0 7785 are encouraged to investi-
safe and reliable operation and, if field-repairable,
gate the possibility of applying the most recent edi-
should be capable of being easily disassembled and
tions of the standards indicated below. Members of
reassembled for maintenance and repair, using
IEC and IS0 maintain registers of currently valid
readily available tools or those supplied by the
International Standards.
manu facturer.
IS0 1797:1985, Dental rotary instruments - Shanks.
Compliance with these requirements cannot be ob-
jectively assessed.
IS0 3696:1987, Water for analytical laboratory use -
Specification and test methods.
Testing shall be carried out in accordance with 4.1.
If in addition the requirements of 3.5 to 3.12 are
IS0 6507-2:1983, Metallic materials - Hardness test
complied with, the requirement of 3.2 is considered
- Vickers test - Part 2: HV 0,2 to less than UV 5.
to be fulfilled.
IS0 9168:1991, Dental handpieces - Hose connec-
3.3 General design
tors.
The handpiece should be comfortable for the oper-
IS0 9687:1992, Dental equipment - Graphical sym-
ator to use and easy to manipulate. The outside
bols.
surface should be easy to clean and particular at-
IEC 651:1979, Sound level meters. tention should be given to provide secure gripping
1
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IS0 7785-1:1992(E)
surfaces for operator manipulation. In order to re- 3.5.2 Spring-type chuck, friction grip
duce glare, highly polished surfaces should be
avoided. When the test mandrel (see figure 2) is inserted into,
or withdrawn from, the spring-type chuck, the force
Compliance with these requirements cannot be ob-
required shall be between 25 N and 45 N.
jectively assessed.
Testing shall be carried out in accordance with
Testing shall be carried out in accordance with 4.1.
4.3.1.
If in addition the requirements of 3.5 to 3.12 are
complied with, the requirement of 3.3 is considered
to be fulfilled.
3.5.3 Mechanical locking chuck
3.4 Head dimensions and nomenclature
When locked in the chuck, the force for extracting
the relevant test mandrel (see figure2) shall be at
If the manufacturer includes the head dimensions in
least 45 N.
the operator's manual (see note 1 in 5.1) they shall
be the dimensions shown in figure 1 and shall be
Testing shall be carried out in accordance with
expressed, using the nomenclature in figure 1, to an
4.3.1.
accuracy of 0,l mm on lengths and of f 1" on
angles.
When locked in the chuck, the relevant test mandrel
(figure2) shall transmit a torque of at least 4 N.cm 0
Testing shall be carried out using measurement de-
without slipping.
vices as specified in 4.2.
Testing shall be carried out in accordance with
3.5 Chuck
4.3.2.
The locking or unlocking force required to position
3.5.1 General
the rotary instrument in the chuck should be the
The chuck shall be capable of accepting rotary in- minimum force sufficient to prevent accidental un-
struments complying with IS0 1797. locking in use.
Vlslblllty
Wldth
I I
f angle
Figure 1 - Nomenclature of head dimensions
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IS0 7785-1 :I 992(E)
Di mensions in mi I I I metres
surface roughness values in micrometres
Rounded ends
0,25
(bath ends)
0.15 / -7
P
8 0.5 * 0,l 0,s f 0,l
19 f 0,l
I=
Figure 2 - Test mandrel
3.5.4 Push-button locking chucks and other 3.7 Water and spray air supply
e systems
3.7.1 General
When locked in the chuck, the force for extracting
the test mandrel (figure 2) shall be at least 25 N.
The handpiece shall provide cooling capability at the
Testing shall be carried out in accordance with operating point.
4.3.1.
Testing shall be carried out in accordance with 4.1
When locked in the chuck, the test mandrel shall and 4.4.
transmit a torque of at least 4 Nxm without slipping.
Testing shall be carried out in accordance with
3.7.2 Water cooling
4.3.2.
The handpiece shall provide water cooling capability
to the cutting portion of the rotary instrument. The
3.5.5 Eccentricity
handpiece shall be capable of attaining a water
flow-rate of at least 50 cm3/min at 200 kPa (2 bar).
The eccentricity of the test mandrel without applied
Testing shall be carried out in accordance with
load shall not exceed a total indicated run-out of
4.4.2.1.
0,03 mm.
Testing shall be carried out in accordance with
0 4.3.3. 3.7.3 Air cooling
Handpieces having air coolant capability shall direct
air to the cutting portion of the rotary instrument.
3.6 Performance
Simultaneous use with cooling water shall permit
the creation of a cooling mist. The handpiece shall
be capable of attaining an air flow-rate of at least
3.6.1 Speed
1,5 STD (Standard flow-rate) I/min.
The rotational speed of the test mandrel (figure 2)
Testing shall be carried out in accordance with
shall not be below the minimum free-running speed
4.4.2.2.
stated by the manufacturer in the operator’s manuaf
(see clause 5), wit
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