1、Dentistry Laboratory cuttersPart 3: Carbide cutters for milling machinesBS EN ISO 77873:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation of EN ISO 77873:2017. It supersedes BS EN 277873:1994 which is
2、withdrawn.The UK participation in its preparation was entrusted to Technical Committee CH/106/4, Dental Instruments and Equipment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provision
3、s of a contract. Users are responsible for its correct application.ISBN 978 0 580 90416 5ICS 11.060.20Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 20
4、17.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 77873:2017EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 77873May 2017ICS 11.060.20 Supersedes EN 277873:1993EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR
5、NORMUNGCENCENELEC Management Centre: Avenue Marnix 17, B1000 Brussels 2017 CEN Ref. No. EN ISO 77873:2017: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national MembersDentistry Laboratory cutters Part 3: Carbide cutters for milling machines (ISO 77873:2017)Mde
6、cine buccodentaire Fraises de laboratoire Partie 3: Fraises de laboratoire en carbure pour machines fraiser (ISO 77873:2017)Zahnheilkunde Laborfrser Teil 3: Metallfrser fr Frsmaschinen (ISO 77873:2017)This European Standard was approved by CEN on 1 March 2017.CEN members are bound to comply with the
7、 CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Uptodate lists and bibliographical references concerning such national standards may be obtained on application to the CENCENELEC Management Ce
8、ntre 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 the CEN-CENELEC Management Centre has the same status as th
9、e official versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherl
10、ands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN ISO 77873:2017 (E)European forewordThis document (EN ISO 77873:2017) has been prepared by Technical Committee ISO/TC 106 “Dentistry” in collaboration with Tech
11、nical Committee CEN/TC 55 “Dentistry” the secretariat of which 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 November 2017, and conflicting national standards shall be withdrawn a
12、t the latest by November 2017.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights.This document supersedes EN 277873:1993 .According to the
13、 CENCENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hun
14、gary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 7787-3:2017 has been approved by CEN as EN ISO 7787-3:2017 with
15、out any modification.iiBS EN ISO 77873:2017ISO 77873:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms, definitions and symbols 13.1 Terms and definitions . 13.2 Symbols . 24 Requirements 24.1 Material . 24.2 Dimensions, shank and head shape 24.3 Cylindrical, side cutting on
16、ly . 24.4 Cylindrical, hemispherical . 34.5 Conical, truncated, side cutting only 34.6 Runout 45 Sampling 46 Measurement and test methods . 46.1 Dimensions . 46.2 Runout 46.3 Pass/fail evaluation . 47 Designation code number . 48 Marking 5Bibliography 6 ISO 2017 All rights reserved iiiContents PageB
17、S EN ISO 77873:2017ISO 77873:2017(E)ForewordISO (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 in
18、terested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and nongovernmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnic
19、al Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO docu
20、ments should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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 responsib
21、le for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for
22、the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in
23、 the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee SC 4, Dental instruments.This second edition cancels and replaces the first edition (ISO 7787-3:1991), which has been tech
24、nically revised with the following changes:a) normative references have been updated;b) definitions were added;c) clauses have been renumbered;d) bibliography was added.A list of all parts in the ISO 7787 series can be found on the ISO website.iv ISO 2017 All rights reservedBS EN ISO 77873:2017ISO 7
25、7873:2017(E)IntroductionThis document is one of a series of International Standards relating to dental rotary instruments.The various dimensional and other requirements specified for carbide laboratory cutters are those considered important to ensure the interchangeability of these instruments. ISO
26、2017 All rights reserved vBS EN ISO 77873:2017This page deliberately left blankDentistry Laboratory cutters Part 3: Carbide cutters for milling machines1 ScopeThis document specifies dimensional and other requirements for the three most commonly used carbide cutters for milling machines which are pr
27、edominantly used in the dental laboratory.Other characteristics of laboratory cutters (for example, spiralled blades or crosscut) are not covered by this document.Cutters intended for use with CAD/CAM systems are excluded from the scope of this document.2 Normative referencesThe following documents
28、are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1797: 2017, Dentis
29、try Shanks for rotary and oscillating instrumentsISO 1942, Dentistry VocabularyISO 2157, Dentistry Nominal diameters and designation code numbers for rotary instrumentsISO 8325, Dentistry Test methods for rotary instruments3 Terms, definitions and symbols3.1 Terms and definitionsFor the purposes of
30、this document, the terms and definitions given in ISO 1942 and the following apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.
31、org/obp3.1.1laboratory cuttercutting instrument designed for use with dental materials in the dental laboratory (3.1.2)3.1.2dental laboratoryfacility where dental technician procedures complementing dental clinical treatment are carried outSOURCE: ISO 1942:2009, 2.773.1.3milling machinedevice used i
32、n the dental laboratory (3.1.2) for milling of dental prosthetic partsINTERNATIONAL STANDARD ISO 77873:2017(E) ISO 2017 All rights reserved 1BS EN ISO 77873:2017ISO 77873:2017(E)3.2 Symbolsd1diameter of the working part, head diameterd2diameter at the end of the working partl1length of the working p
33、art, head lengthl2total length of laboratory cutter4 Requirements4.1 MaterialThe shank of the laboratory cutter shall be made of steel or other suitable material.The working part shall be made of tungsten carbide.The selection of the type of material and the treatment given to it shall be left to th
34、e discretion of the manufacturer.4.2 Dimensions, shank and head shapeAll dimensions are in millimetres.The dimensions shall be as specified in Table 1, Table 2 and Table 3 and as shown in Figure 1, Figure 2 and Figure 3.The shank of the laboratory cutter shall be Type 2 or Type 4 in accordance with
35、ISO 1797.In this document, the laboratory cutters are differentiated according to the shape of the head of the laboratory cutters.Test in accordance with 6.1.4.3 Cylindrical, side cutting onlyA cylindrical cutter for side cutting only shall be as specified in Figure 1 and Table 1.Figure 1 Cylindrica
36、l, side cutting only2 ISO 2017 All rights reservedBS EN ISO 77873:2017ISO 77873:2017(E)Table 1 Cylindrical, side cutting only Dimensions and number of bladesDimensions in millimetresNominal size d1 0,08 l1 0,5 l2a 0,5d2max.Number of blades min.010 1,0 8 30 1,08 12015 1,5 10 30 1,58 16023 2,3 15 34 2
37、,35 22aThe limitations of ISO 1797:2017, Table 1 do not apply because these cutters are used in milling machines in the dental laboratory.Test in accordance with 6.1.4.4 Cylindrical, hemisphericalA cylindrical cutter, hemispherical, shall be as specified in Figure 2 and Table 2.Figure 2 Cylindrical,
38、 hemisphericalTable 2 Cylindrical, hemispherical Dimensions and number of bladesDimensions in millimetresNominal size d1 0,08 l1 0,5 l2a 0,5d2max.Number of blades min.010 1,0 8 30 1,08 12015 1,5 10 30 1,58 16023 2,3 15 34 2,35 22aThe limitations of ISO 1797:2017, Table 1 do not apply because these c
39、utters are used in milling machines in the dental laboratory.Test in accordance with 6.1.4.5 Conical, truncated, side cutting onlyA conical cutter, truncated, for side cutting only shall be as specified in Figure 3 and Table 3.Figure 3 Conical, truncated, side cutting only ISO 2017 All rights reserv
40、ed 3BS EN ISO 77873:2017ISO 77873:2017(E)Table 3 Conical, truncated, side cutting only Dimensions and number of bladesDimensions in millimetresAngles in degreeNominal size d1 0,08 l1 0,5 l2a 0,5 0,5Number of blades min.023 2,3 13 32 4 12025 2,5 13 32 6 12031 3,1 13 32 8 14035 3,5 13 32 10 16040 4,0
41、13 32 12 18aThe limitations of ISO 1797:2017, Table 1, do not apply because these cutters are used in milling machines in the dental laboratory.Test in accordance with 6.1.4.6 RunoutThe total indicated runout determined as described in ISO 8325 shall not exceed 0,08 mm.Test in accordance with 6.2.5
42、SamplingTake 10 instruments at random from the validation batch and test them according to the methods described in Clause 6.This test is intended as type test and not as a routine test, e.g. for production batch control.6 Measurement and test methods6.1 DimensionsMeasurement of dimensions shall be
43、made in accordance with ISO 8325 with suitable measuring devices.The manufacturer shall validate that the accuracy of the measuring device is suitable.6.2 RunoutRecord the readings for each cutting edge and sort the highest and the lowest for further analysis.6.3 Pass/fail evaluationIf eight or fewe
44、r laboratory cutters pass, the product fails.If nine laboratory cutters pass, test 10 additional laboratory cutters. When 10 additional laboratory cutters are tested, all 10 additional laboratory cutters shall pass for the product to comply.7 Designation code numberThe designation code numbers for l
45、aboratory cutters shall be in accordance with ISO 2157.4 ISO 2017 All rights reservedBS EN ISO 77873:2017ISO 77873:2017(E)8 MarkingLaboratory cutters shall be marked with the following information:a) trade name and/or trade mark of the manufacturer;b) nominal size designation. ISO 2017 All rights re
46、served 5BS EN ISO 77873:2017ISO 77873:2017(E)Bibliography1 ISO 63603, Dentistry Number coding system for rotary instruments Part 3: Specific characteristics of burs and cutters6 ISO 2017 All rights reservedBS EN ISO 77873:2017This page deliberately left blankBSI is the national body responsible for
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