1、BRITISH STANDARD BS3886:1965 Specification for Dental impression compoundBS3886:1965 This BritishStandard, having been approved by the Dental Industry Standards Committee and endorsed by the Chairman ofthe Chemical Divisional Council, was published undertheauthority of the GeneralCouncil on 29April1
2、965 BSI12-1999 The following BSI references relate to the work on this standard: Committee references DNC/4 DNC/4/2 Draft for comment D63/9917 ISBN 0 580 04380 0 Co-operating organizations The Dental Industry Standards Committee, under whose supervision this BritishStandard was prepared, consists of
3、 representatives from the following Government departments and scientific and industrial organizations: Association of Dental Hospitals of Great Britain and Northern Ireland* British Dental Association* British Dental Manufacturers Association* Dental Education Advisory Council* D.S.I.R. National En
4、gineering Laboratory Ministry of Defence, Navy Department* Ministry of Health* Royal College of Surgeons of England Royal Society of Medicine Scottish Home and Health Department The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together
5、 with the following, were directly represented on the committee entrusted with the preparation of this standard: D.S.I.R. Laboratory of the Government Chemist Institute of Dental Surgery London Dental Study Club Ministry of Defence, Air Force Department Amendments issued since publication Amd. No. D
6、ate CommentsBS3886:1965 BSI 12-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 General 1 3 Plastic deformation (flow) 1 4 Impression taking properties 1 5 Sampling 1 6 Information to be supplied by the manufacturer 1 7 Marking of containers 1 Appendix A Det
7、ermination of plastic deformation (flow) 2 Appendix B Evaluation of impression taking properties 3 Figure 1 Mould for forming specimens for flow test 3 Figure 2 Flow testing instrument 4 Figure 3 Test block 5 Table 1 Requirements for plastic deformation (flow) 1BS3886:1965 ii BSI 12-1999 Foreword Th
8、is standard makes reference to the following BritishStandard: BS593, Laboratory thermometers. This BritishStandard forms one of a series for dental instruments and materials prepared under the authority of the BSI Dental Industry Standards Committee. The specification has been partly based on the re
9、quirements of the American Dental Association Specification No.3 for Dental impression compound and of the Australian Standard Specification No. T6 for Dental modelling compound, to which acknowledgment is made. A British Standard does not purport to include all the necessary provisions of a contrac
10、t. 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, pagesi andii, pages1 to6, an inside back cover and
11、 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.BS3886:1965 BSI 12-1999 1 1 Scope This BritishStandard specifies requirements for dental impression compound (excluding
12、 elastic type of compound) suitable for taking impressions in the oral cavity. 2 General The material shall be suitable for taking impressions in the oral cavity and shall comply with the following requirements: a) The material shall be uniform and free from ingredients injurious to the mouth. b) Th
13、e material shall remain homogeneous within the range of working temperatures. c) The material shall give a smooth glossy surface after flaming. d) When the material is trimmed with a knife at room temperature, firm smooth margins shall be obtained. 3 Plastic deformation (flow) The plastic deformatio
14、n (flow) characteristics of the compound, determined in accordance with Appendix A, shall comply with the requirements of Table 1. Table 1 Requirements for plastic deformation (flow) 4 Impression taking properties The impression compound shall satisfy the requirements for impression taking propertie
15、s in accordance with Appendix B. 5 Sampling A representative sample shall be taken from each batch of the material. 6 Information to be supplied by the manufacturer The following information shall be supplied with each container: a) Method of softening. b) Working temperature. c) A curve or data sho
16、wing the shrinkage of the compound on cooling from40 C to20 C. 7 Marking of containers Each container shall be clearly marked with the following: a) The name or trade mark of the manufacturer or supplier. b) Description of contents. c) Batch number. d) Date of manufacture (year and month) as a separ
17、ate item or as part of the batch number. e) Weight of contents in package. f) The number of this BritishStandard, i.e.BS3886. NOTEThe mark BS3886 on or in relation to the product is a claim by the manufacturer that it complies with the requirements of the standard. The BritishStandards Institution i
18、s the owner of a registered certification trade mark. This is shown below, enclosed in the words “Approved to BritishStandard”. This mark can be used only by manufacturers licensed under the certification mark scheme operated by the BSI. The presence of this mark on or in relation to a product is an
19、 assurance that the goods have been produced to comply with the requirements of the BritishStandard under a system of supervision, control and testing operated during manufacture and including periodical inspection at the manufacturers works in accordance with the certification mark scheme of the BS
20、I. Further particulars of the terms of licence may be obtained from the Director, BritishStandards Institution,2Park Street, London, W.1. Temperature Plastic deformation (flow) C 37 45 20.0per cent maximum 85.0per cent minimumBS3886:1965 2 BSI 12-1999 Appendix A Determination of plastic deformation
21、(flow) A.1 Apparatus a) Mould for casting of test specimens. The mould shall consist of a stainless steel plate resting on a smooth glass slab. The metal plate shall be6.0mm thick, having flat parallel surfaces and containing four holes10.0mm in diameter as illustrated in Figure 1. The axes of the h
22、oles shall be perpendicular to the surfaces of the plate. The sides of the holes shall be finished smooth. The glass slab shall be about150mm long,75mm wide and20mm thick (6in 3in 0.75in). b) Flow testing instrument. The flow testing instrument shall be as illustrated in Figure 2 and shall consist o
23、f the following: A a weight; B a shaft having low thermal conductivity; C a brass platen. The total weight, in air, of these three components shall be2000g. The weight A shall be separated a minimum distance of76mm (3in) from the brass platen C by the shaft B which shall be of ebonite or of a simila
24、rly poor thermal conductor to reduce heat loss from the specimen. The diameter of the brass platen shall be not less than51mm (2in). The thickness shall not exceed6.35mm (0.25in). c) Water bath. The water bath shall be capable of maintaining the specified temperature(37 C and45 C) to within a tolera
25、nce of 0.1degC. A.2 Preparation of specimens A sample of about25g shall be broken into small pieces which shall be placed in a polythene bag and suitably wrapped and sealed with a rubber band to prevent ingress of water. The specimen shall be immersed in water at the working temperature plus or minu
26、s1degC as specified by the manufacturer for20minutes. The material shall be then kneaded for3minutes to uniform consistency with intermittent immersion in the water bath to maintain the working temperature. The softened material shall then be moulded into each hole of the mould consisting of the sta
27、inless steel plate and glass slab (seeAppendix A.1 a) both previously warmed to the working temperature specified by the manufacturer. When each hole of the mould is overfilled, a smooth, flat tin-foil-covered or aluminium-foil-covered glass plate, preheated to the working temperature specified by t
28、he manufacturer, shall be placed on the top of the mould. A load of9000g, or alternatively of20lb, shall be applied to the top of the foil-covered glass plate for10minutes. The weight and the glass plate shall then be removed and the excess material trimmed away flush with the mould surface; a metal
29、 scraper drawn across the mould face can be used for this purpose. The perforated metal plate shall be removed from the glass slab by gentle tapping. The specimens shall then be removed from the holes by chilling in water at about10 C, and shall then be conditioned at2025 C for about24hours before t
30、esting. A.3 Method of test The initial length of the conditioned specimen shall be determined at2025 C using a micrometer caliper. Four measurements shall be made around the circumference, and one measurement shall be made along the axis of the specimen. The measurements shall be averaged and the re
31、sult recorded to the nearest0.005mm. The specimen and the flow testing instrument as detailed in Appendix A.1 b) shall be placed in a water bath and held at the testing temperature for20minutes before testing. The temperature of the water bath shall be controlled to within 0.1degC of the required te
32、mperature. A suitable thermometer selected from BS593 1)and provided with a certificate of errors supplied by the National Physical Laboratory or equivalent body shall be used for determining the temperature. Agitation shall be provided in the water bath by means of a mechanical stirrer. A thin shee
33、t of waterproof cellulosic film shall be placed between the instrument and each end of the specimen. The bottom of the specimen shall be51mm (2in) below the surface of the water in the bath. A constant axial load of2000g shall then be applied to the specimen for10minutes, after which the specimen sh
34、all be removed and cooled in air to2025 C. The cellulosic film shall be stripped off and the final length determined in the same manner as the initial length. 1) BS593, “Laboratory thermometers”.BS3886:1965 BSI 12-1999 3 The flow as demonstrated by the change in length shall be reported as the perce
35、ntage of the initial length. The value for flow at any temperature shall be the average value for two specimens and shall be reported to the nearest0.1per cent. Appendix B Evaluation of impression taking properties B.1 Apparatus a) A test block of the form and dimensions shown in Figure 3. b) A flat
36、 plate to support the specimen while it is attaining the required temperature. c) A weight having a base approximately50mm in diameter and weighing1000g. d) A water bath, the temperature of which can be controlled at45.0 0.1 C. B.2 Preparation of specimens A disk not less than40mm in diameter and be
37、tween4mm and7mm in thickness shall be prepared in a suitable mould after the sample specimen of the material has been prepared in accordance with Appendix A. B.3 Procedure The flat plate, the test block, and the weight of1000g shall be immersed in a water bath at45.0 0.1 C. The water level of the wa
38、ter bath shall be305mm above the top surface of the test block. The specimen shall then be placed on the flat plate in the water bath. After immersion for20minutes the specimen shall be centred on the test block, a thin sheet of suitable material (e.g.water resistant transparent cellulose film) shal
39、l be placed over the specimen and the weight of1000g applied for10minutes. As soon as the load is removed the test block and the specimen shall be taken from the water bath and chilled in water at a temperature of about10 C. The chilled specimen shall then be removed from the block and examined. The
40、 impression shall be considered satisfactory if the ridges corresponding to the large grooves of the test block are sharp, and the ridges corresponding to the fine grooves are complete and visible to the unaided eye for at least30mm of their length. Figure 1 Mould for forming specimens for flow test
41、BS3886:1965 4 BSI 12-1999 Figure 2 Flow testing instrumentBS3886:1965 BSI 12-1999 5 Figure 3 Test block6 blankBS3886:1965 BSI 12-1999 BritishStandards The following are available on application: YEARBOOK Including subject index and numerical list of BritishStandards15s. SECTIONAL LISTS. Gratis Acous
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