ISO INTERNATIONAL STANDARD 20795-2 Secondedition 2013-03-01 Dentistry Base polymers Part 2: Orthodontic base polymers Médecine bucco-dentaire - Polymeres de base - Partie 2: Polymeres pour base orthodontique Reference number IS0 20795-2:2013(E) LSO IS02013 IHS under itted without license from IHS Not for Resale IS0 20795-2:2013(E) COPYRIGHTPROTECTEDDOCUMENT ISO2013 All rights reserved. Unless otherwise specified, 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 Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 20795-2:2013(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms and definitions 4 Classification ..2 5 Requirements .2 5.1 Unpolymerized material .2 5.2 Polymerized material ..3 6 Sampling. .5 7 Preparation of specimen plates and test specimens. .5 7.1 Laboratory environment .5 7.2 Procedures .5 7.3 Special equipment. .5 8 Test methods. .5 8.1 Inspection for compliance determination 5 8.2 Colour. 6 8.3 Polishability, freedom from porosity, ultimate flexural strength, and flexural modulus. .6 8.4 Fracture toughness with a modified bending test 10 8.5 Residualmethylmethacrylatemonomer 14 8.6 Plasticiser(s), where applicable 19 8.7 Water sorption and solubility .23 9 Requirements for labelling, marking, packaging, and instructions supplied by manufacturer .26 9.1 Packaging .26 9.2 Marking of outer packages and containers 26 9.3 Manufacturer's instructions. .27 Annex A (normative) HPLC method for determination of MMA content ..28 Bibliography .31 iii se with IS thout license from IHS Not for Resale