1、BRITISH STANDARD BS6828-8.1: 1987 EN27787-1: 1989 ISO7787-1: 1984 Incorporating Amendment No.1 Dental rotary instruments Part8: Cutters Section8.1 Specification for steel laboratory cutters This European Standard EN27787-1:1989 has the status of a British Standard UDC 615.472:616.314BS6828-8.1:1987
2、This British Standard, having been prepared under the directionof the Health Care Standards Committee, was published under the authorityofthe Board of BSI andcomes intoeffect on 29May1987 BSI 12-1999 The following BSI references relate to the work on this standard: Committee referenceHCC/52 Draft fo
3、r comment82/53667DC ISBN 0 580 15764 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Health Care Standards Committee (HCC/-) to Technical CommitteeHCC/52, upon which the following bodies were represented: British Dental Association Bri
4、tish Dental Trade Association British Endodontic Society British Society for Restorative Dentistry British Society for the Study of Orthodontics British Society for the Study of Prosthetic Dentistry Dental Education Advisory Council Department of Health and Social Security Federation of British Dent
5、al Industries Ministry of Defence Scottish Health Services Amendments issued since publication Amd. No. Date of issue Comments 6676 May1991 Indicated by a sideline in the marginBS6828-8.1:1987 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii Brief history 2
6、Text of EN27787 3 Publications referred to Inside back coverBS6828-8.1:1987 ii BSI 12-1999 National foreword This Section of BS6828 has been prepared under the direction of the Health Care Standards Committee. It is identical with ISO7787 “Dental rotary instruments” Part1:1984 “Steel laboratory cutt
7、ers”, prepared by Technical Committee106 “Dentistry” of the International Organization for Standardization (ISO). The titles of BS6828-1 to BS6828-9 are given in BS6828-1. In1989 the European Committee for Standardization (CEN) accepted ISO7787-1:1984 as European Standard EN27787-1:1989. Terminology
8、 and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma h
9、as been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” and “part of ISO7787” appear, referring to this standard, they should be read as “British Standard” and “Section of BS6
10、828” respectively. A British Standard does not purport to include all the necessary provisions 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. Cross-references Inter
11、national Standard Corresponding British Standard BS6828 Dental rotary instruments ISO1797:1985 a Part1:1987 Specification for shanks (Identical) ISO2157:1984 Part2:1987 Specification for nominal sizes and designations (Identical) ISO2859:1984 BS6001 Sampling procedures for inspection by attributes P
12、art1:1972 Specification for sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection (Technically equivalent) BS6828 Dental rotary instruments Part5: Number coding system ISO6360-1:1985 b Section5.1:1987 Specification for general characteristics (Identical) ISO6360-2:1986 b
13、 Section5.2:1987 Specification for shape and specific characteristics (Identical) ISO8325:1985 a Part9:1987 Methods of test (Identical) a Referred to in clause2 as at the stage of draft, but now published. b Referred to in the text as ISO6360 and as at the stage of draft, but now published. Summary
14、of pages This document comprises a front cover, an inside front cover, pagesi andii, the EN title page, pages2 to8, 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 th
15、e inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 27787 February1990 UDC 615.472:616.314 Key words: Dentistry, dental equipment, dental rotary-cutting instruments, burs (dental), steels, specifications, number of teeth, dimensions, shape English version Dentistry Dental rotar
16、y instruments Cutters Part1: steel laboratory cutters (ISO7787-1:1984) Art dentaire Instruments rotatifs dentaires Fraises techniques Partie1: Fraises techniques en acier (ISO7787-1:1984) Zahnheilkunde Zahnrztliche rotierende Instrumente Frser Teil1: Laborfrser aus Stahl (ISO7787-1:1984) This Europe
17、an Standard was accepted by CEN on20th December1989 and is identical to the ISO standard as referred to. CEN members are bound to comply with the requirements of the CEN/CENELEC Common Rules which stipulate the conditions for giving this European Standard the status of a national standard without an
18、y alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language mad
19、e by translation under the responsibility of a CEN member into its own language and notified to CEN Central Secretariat has the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland,
20、 Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN1990 Copyright reserved to all CEN me
21、mbers Ref. No. EN 27787-1:1989EEN27787:1990 BSI 12-1999 2 Brief history This European Standard has been taken over by CEN/TC55 “Dental Products” from the work of the International Organization for Standardization (ISO). The content of this European Standard is identical with the International Standa
22、rd7787-1 of ISO published in1984. The results of the Formal Vote being positive, the CEN Technical Board ratified this European Standard on1989-12-20. In accordance with the CEN/CENELEC Common Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Fi
23、nland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Brief history 2 0 Introduction 3 1 Scope and field of application 3 2 References 3 3 Symbols 3 4 Material 3 5 Dimensions and number of blade
24、s 3 6 Run-out 8 7 Sampling and acceptance level 8 Figure 1 4 Figure 2 4 Figure 3 5 Figure 4 5 Figure 5 6 Figure 6 6 Figure 7 7 Figure 8 7 Figure 9 8 Table 1 Dimensions and number of blades 4 Table 2 Dimensions and number of blades 4 Table 3 Dimensions and number of blades 5 Table 4 Dimensions and nu
25、mber of blades 5 Table 5 Dimensions and number of blades 6 Table 6 Dimensions and number of blades 6 Table 7 Dimensions and number of blades 7 Table 8 Dimensions and number of blades 7 Table 9 Dimensions and number of blades 8EN27787:1990 BSI 12-1999 3 0 Introduction This International Standard is o
26、ne of a series of standards relating to dental rotary instruments. It consists of two parts: Part1: Steel laboratory cutters; Part2: Carbide laboratory cutters. The various dimensional and other requirements specified for steel cutters are those considered important to ensure the interchangeability
27、of these instruments. Attention is drawn to ISO6360 which specifies a15 digit number for the identification of dental rotary instruments of all types. 1 Scope and field of application This part of ISO7787 specifies the dimensional and other requirements for the nine most commonly used steel cutters
28、1)which are predominantly used in the dental laboratory. Other characteristics of cutters, for example spiralled blades, cross-cut, are not covered by this International Standard. These will be dealt with in a future International Standard. 2 References ISO1797, Dental rotary instruments Shanks 2) .
29、 ISO2157, Dental rotary instruments Nominal sizes and designation. ISO2859, Sampling procedures and tables for inspection by attributes. ISO6360, Dental rotary instruments Number coding system 3) . ISO8325, Dental rotary instruments Test methods 3) . 3 Symbols 4 Material The shaft and the working pa
30、rt shall be made of steel. The selection of the type of steel and the treatment given to it shall be left to the discretion of the manufacturer. 5 Dimensions and number of blades All dimensions are in millimetres. The dimensions, determined as described in ISO8325, shall be as specified in the table
31、s and as shown inFigure 1 toFigure 9. The shank shall be type2 of ISO1797. 1) Sometimes called laboratory burs. 2) At present at the stage of draft. (Revision of ISO1797:1976.) 3) At present at the stage of draft. d diameter of the working part, head diameter. l length of the working part, head leng
32、th.EN27787:1990 4 BSI 12-1999 5.1 Round head (spherical) Table 1 Dimensions and number of blades 5.2 Cylindrical, double domed Table 2 Dimensions and number of blades Figure 1 Nominal size d +0,15 0,25 l 0,25 Number of blades min. 040 050 060 070 080 4 5 6 7 8 3,7 4,7 5,8 6,8 7,8 8 10 12 14 16 Figur
33、e 2 Nominal size d +0,15 0,25 l 0,25 Number of blades min. 040 050 060 070 080 4 5 6 7 8 9 10 11 12 13 8 10 12 14 16EN27787:1990 BSI 12-1999 5 5.3 Egg (longitudinal ellipsoidal) Table 3 Dimensions and number of blades 5.4 Transverse oval Table 4 Dimensions and number of blades Figure 3 Nominal size
34、d +0,15 0,25 l 0,25 Number of blades min. 040 050 060 070 080 4 5 6 7 8 9 10 11 12 13 8 10 12 14 16 Figure 4 Nominal size d +0,15 0,25 l 0,25 Number of blades min. 040 050 060 070 080 4 5 6 7 8 2,5 3,0 3,5 4,0 4,5 8 10 12 14 16EN27787:1990 6 BSI 12-1999 5.5 Bud rounded (hemispherical/truncated conic
35、al, inverted hemispherical) Table 5 Dimensions and number of blades 5.6 Bud (ogivo/hemispherical inverted) Table 6 Dimensions and number of blades Figure 5 Nominal size d +0,15 0,25 l 0,25 Number of blades min. 040 050 060 070 080 4 5 6 7 8 8 9,5 11,0 12,5 14,0 8 10 12 14 16 Figure 6 Nominal size d
36、+0,15 0,25 l 0,25 Number of blades min. 040 050 060 070 080 4 5 6 7 8 7 8 9 10 11 8 10 12 14 16EN27787:1990 BSI 12-1999 7 5.7 Pear (hemispherical/inverted conical truncated) Table 7 Dimensions and number of blades 5.8 Bud slender (ogivo/hemispherical inverted, slender) Table 8 Dimensions and number
37、of blades Figure 7 Nominal size d +0,15 0,25 l 0,25 Number of blades min. 040 050 060 070 080 4 5 6 7 8 9 10 11 12 13 8 10 12 14 16 Figure 8 Nominal size d +0,15 0,25 l 0,25 Number of blades min. 040 050 060 070 080 4 5 6 7 8 10 11 12 13 14 8 10 12 13 14EN27787:1990 8 BSI 12-1999 5.9 Wheel Table 9 D
38、imensions and number of blades 6 Run-out The total indicated run-out determined as described in ISO8325 shall not exceed0,12mm. The measurement point is the largest diameter or, for cylindrical instruments, the middle of the working part. 7 Sampling and acceptance level The acceptable quality level
39、(AQL) according to ISO2859 shall be6,5. Figure 9 Nominal size d +0,15 0,25 l 0,25 Number of blades min. 100 125 140 160 10 12,5 14 16 3,5 3,7 4,0 4,0 18 22 26 30BS6828-8.1:1987 BSI 12-1999 Publications referred to See national foreword.BS6828-8.1: 1987 EN27787-1: 1989 ISO7787-1: 1984 BSI 389 Chiswic
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