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1、BRITISH STANDARD BS EN ISO 9694:1999 Incorporating Amendment No. 1 to BS ISO 9694:1996 (renumbers the BS ISO as BS EN ISO 9694:1999) Dental phosphate-bonded casting investments The European Standard EN ISO 9694:1998 has the status of a British Standard ICS 11.060.10 Licensed Copy: sheffieldun sheffi
2、eldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9694:1999 This British Standard, having been prepared under the direction of the Health and Environment Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 Septe
3、mber 1997 BSI 03-2000 ISBN 0 580 28018 7 National foreword This British Standard is the English language version of EN ISO 9694:1996 which reproduces verbatim ISO 9694:1996 and implements it as the UK national standard. It supersedes BS 5189-2:1975 which is withdrawn. The UK participation in its pre
4、paration was entrusted to Technical Committee CH/51, Prosthodontic and orthodontic materials, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the
5、UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publicatio
6、ns referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provision
7、s of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title pag
8、e, page 2, the ISO title page, pages ii to iv, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publicati
9、on Amd. No.DateComments 10436April 1999 Implementation of European Standard Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9694:1999 BSI 03-2000i Contents Page National forewordInside front cover Foreword2 Forewordiii Text of ISO
10、96941 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9694 November
11、1998 ICS 11.060.10 Descriptors: See ISO document English version Dental phosphate-bonded casting investments (ISO 9694:1996) Revtements pour coules dentaires liant-phosphate (ISO 9694:1996) Phosphatgebundene Einbettmassen in der Zahnheilkunde (ISO 9694:1996) This European Standard was approved by CE
12、N on 20 November 1998. 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 standar
13、ds 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 th
14、e Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United
15、Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 969
16、4:1998 E Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 9694:1998 BSI 03-2000 2 Foreword The text of the International Standard from ISO/TC 106, Dentistry, of the International Organization for Standardization (ISO) has been taken ov
17、er as a European Standard by Technical Committee CEN/TC 55, Dentistry, the Secretariat 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 May 1999, and conflicting national standards
18、shall be withdrawn at the latest by May 1999. According to CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, I
19、taly, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontrolled
20、Copy, (c) BSI BS EN ISO 9694:1999 ii BSI 03-2000 Contents Page Forewordiii Introduction1 1Scope1 2Normative reference1 3Definitions1 4Classification1 5Requirements1 5.1Quality1 5.2Fluidity1 5.3Initial setting time1 5.4Compressive strength1 5.5Linear thermal expansion1 6Sampling, conditioning and mix
21、ing2 6.1Sampling2 6.2Conditioning2 6.3Mixing2 6.3.1Apparatus2 6.3.2Procedure2 7Test methods2 7.1Fluidity2 7.1.1Apparatus2 7.1.2Procedure2 7.1.3Evaluation2 7.2Initial setting time3 7.2.1Apparatus3 7.2.2Procedure3 7.2.3Evaluation3 7.3Compressive strength3 7.3.1Apparatus3 7.3.2Procedure3 7.3.3Evaluatio
22、n4 7.4Linear thermal expansion4 7.4.1Apparatus4 7.4.2Procedure4 7.4.3Evaluation4 8Manufacturers instructions4 9Packaging5 9.1Powder5 9.2Special liquid5 10Marking5 10.1Containers5 10.2Individual packets5 10.3Container of special liquid5 Annex ZA (normative) Normative references to international publi
23、cations with their relevant European publicationsInside back cover Figure 1 Typical Vicat needle apparatus6 Descriptors: Dentistry, dental materials, dental casting investments, classification, specifications, physical properties, tests packaging, marking, instructions. Licensed Copy: sheffieldun sh
24、effieldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9694:1999 BSI 03-2000iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards
25、 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 p
26、art in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Sta
27、ndard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 9694 was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee SC 2, Prosthodontic materials. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontr
28、olled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9694:1999 BSI 03-20001 Introduction This is the first edition of a standard for dental phosphate-bonded casting investments. During its preparation consid
29、eration was given to including a requirement for setting expansion. No suitable test was available but work continues on the development of a requirement and a test for inclusion at the earliest possible date. 1 Scope This International Standard classifies dental phosphate-bonded casting investments
30、 into two types according to the intended use. It specifies requirements for the essential physical properties of the investment and the test methods to be used to determine these properties. It also includes a requirement for adequate instructions to accompany each package. 2 Normative reference Th
31、e following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are
32、 encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3696:1987, Water for analytical use Specification and test method. 3 Definitions For the purposes
33、of this International Standard, the following definitions apply. 3.1 dental phosphate-bonded casting investment powder mixture of a refractory filler system and a binding system specially designed for casting dental alloys NOTEThe refractory filler system usually consists of refractory oxides such a
34、s silica. The binding system usually consists mainly of an acidic phosphate, such as ammonium dihydrogen phosphate, together with a basic oxide, such as magnesium oxide. When the powder is mixed with an appropriate liquid, it forms a paste that hardens to form an investment mould suitable for castin
35、g dental alloys. The appropriate liquid is either water, special liquid or special liquid mixed with water. 3.2 special liquid liquid made available by the manufacturer or supplier for mixing with the investment powder NOTEThe special liquid usually consists mainly of a suspension of colloidal silic
36、a particles in water. 4 Classification Phosphate-bounded investments are classified into two types, according to their intended use with alloys having a solidus temperature above 1 080 C, as follows: Type 1: For inlays, crowns and other fixed restorations. Type 2: For partial dentures and other cast
37、, removable restorations. NOTEThese investments may be used with alloys of lower melting temperature if so recommended by the manufacturer. 5 Requirements 5.1 Quality The powder shall be of uniform quality and free from foreign matter and lumps when examined visually. If a special liquid (see 3.2) i
38、s required, it shall be free of abnormal sediment. If a mould liner is supplied, or if the use of a mould liner is recommended see 8 d), it shall not contain asbestos fibre. 5.2 Fluidity The diameter of the base of the set investment mass shall be at least 90 mm for Type 1 material and at least 70 m
39、m for Type 2 material, when tested in accordance with 7.1. 5.3 Initial setting time The initial setting time, tested in accordance with 7.2, shall not differ by more than 30 % from the time stated by the manufacturer. If the manufacturer gives a range of setting time, then the setting time shall not
40、 differ from the midpoint of this range by more than 30 % of this midpoint. 5.4 Compressive strength The compressive strength of investment types 1 and 2 shall be not less than 2,5 MPa and 3 MPa respectively, when tested in accordance with 7.3. 5.5 Linear thermal expansion The linear thermal expansi
41、on, when tested in accordance with 7.4 at 950 C, shall not differ by more than 15 % from the value stated by the manufacturer. If manufacturer gives a range of linear thermal expansion, then the linear thermal expansion shall not differ from the midpoint of this range by more than 15 % of this midpo
42、int. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 15 13:09:01 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 9694:1999 2 BSI 03-2000 6 Sampling, conditioning and mixing 6.1 Sampling Material selected for testing shall not be beyond the stated expiry date see 10.1 g). Sufficient retail p
43、ackages of the material of one batch shall be obtained to provide at least 5 kg of material. Any packages that are not sealed shall be discarded. If the powder is supplied in bulk, it shall be thoroughly blended and stored in a moisture-proof container. If a special liquid is recommended by the manu
44、facturer see 8 b), a supply shall be obtained. 6.2 Conditioning Testing in accordance with 7.1 and 7.2 shall be carried out at (23 1) C and (50 10) % relative humidity. All other testing of the investment shall be carried out at (23 2) C and (50 10) % relative humidity. All testing shall be carried
45、out in a room free from obvious drafts. All test equipment shall be clean and dry. Before testing begins, material and test equipment shall be conditioned for not less than 16 h at the testing atmosphere. NOTESome components of the mixing and testing equipment are cleaned between tests. These items
46、should be allowed to return to the specified test temperature before being reused. 6.3 Mixing 6.3.1 Apparatus 6.3.1.1 Clean apparatus for mechanical mixing in vacuum, as recommended by the manufacturer, and used exclusively for phosphate-bonded investments. 6.3.1.2 Timing device, such as a stopwatch
47、. 6.3.2 Procedure Measure, to an accuracy of 1 %, the required amount of powder and the required volume of liquid in the mixture ratio given by the manufacturers instructions in accordance with 8 i). If the manufacturer specifies a range of concentration or volume for the liquid, use the midpoint co
48、ncentration or volume. Pour the liquid into the mixing bowl and sift the investment powder into the liquid within 10 s, minimizing entrapment of air. Begin timing from the moment the investment powder and the liquid first make contact. Hand-spatulate for 15 s and then mechanically mix for the time s
49、pecified by the manufacturer see 8 c). Then transfer the mixed investment to the test moulds or forms within 15 s. 7 Test methods 7.1 Fluidity 7.1.1 Apparatus 7.1.1.1 Clean, dry cylindrical ring mould, having a length of (50 1) mm, an inside diameter of (35 1) mm and constructed from a corrosion-resistant, nonabsorbent material. 7.1.1.2 Flat, square glass plate, measuring at least 150 mm 150 mm. 7.1.1.3 Dental vibrator, operating on 50 Hz or 60 Hz power supply. 7.1.1.4 Scale, or rule, graduated in millimetres, to measure the maj
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