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1、 Reference number ISO 4823:2000/Amd.1:2007(E) ISO 2007 INTERNATIONAL STANDARD ISO 4823 Third edition 2000-12-15 AMENDMENT 1 2007-07-01 Dentistry Elastomeric impression materials AMENDMENT 1 Art dentaire Produits pour empreintes, base dlastomres AMENDEMENT 1 ISO 4823:2000/Amd.1:2007(E) PDF disclaimer
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6、body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reserved -,-,- ISO 4823:2000/Amd.1:2007(E) ISO 2007 All rights reserved ii
7、i 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
8、 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 matte
9、rs 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 circula
10、ted 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 responsibl
11、e for identifying any or all such patent rights. Amendment 1 to ISO 4823:2000 was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee SC 2, Prosthodontic materials. -,-,- ISO 4823:2000/Amd.1:2007(E) ISO 2007 All rights reserved 1 Dentistry Elastomeric impression materials AMENDMENT 1
12、 This amendment to ISO 4823-2000 exempts the Type 0 (putty) elastomeric impression materials from compliance with the working time requirement specified in 6.3. Page 3, subclause 6.3 Subclause 6.3 is restructured as shown below to clarify matters pertinent to this exemption. 6.3 Working time (Types
13、1, 2 and 3 only) When tested in accordance with 9.3, the working time shall not be less than that stated in the manufacturers instructions 10.3 f) and shall be at least 30 s longer than the time required to obtain a homogeneous mixture of the components (see 6.2 and 9.1). NOTE Currently, Type 0 mate
14、rials are exempt from compliance with the working time requirement for the following reasons: because some of these materials, which are otherwise satisfactory for the purpose intended, have at least one component which, even before being combined in a mixture, exhibit an inherent elasticity behavio
15、ur that will not permit the mixed material to provide for objectively generated working time data when tested in accordance with 9.3 and because as of now, extensive inter-laboratory testing has not resulted in discovery of reliable ways in which the currently prescribed procedures can be modified t
16、o provide for objective working time testing of the materials exhibiting inherent elasticity behaviour; nor has such testing led to the development of an effective new approach for solving the problem. -,-,- ISO 4823:2000/Amd.1:2007(E) ICS 11.060.10 Price based on 1 page ISO 2007 All rights reserved