1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 27020:2010Dentistry Brackets and tubesfor use in orthodontics (ISO27020:2010)Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy,
2、 (c) BSIBS EN ISO 27020:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO27020:2010.The UK participation in its preparation was entrusted to TechnicalCommittee CH/106/1, Dental restorative and orthodontic materials.A list of organizations represented on t
3、his committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 59600 1ICS 11.060.10Compliance with a British Standard cannot confer immunity from
4、legal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2011.Amendments issued since publicationDate Text affectedLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy, (c) BSIEUROPEAN
5、STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 27020 December 2010 ICS 11.060.10 English Version Dentistry - Brackets and tubes for use in orthodontics (ISO 27020:2010) Mdecine bucco-dentaire - Consoles et tubes utiliss en orthodontie (ISO 27020:2010) Zahnheilkunde - Brackets und Rhrchen fr die Kie
6、ferorthopdie (ISO 27020:2010) This European Standard was approved by CEN on 14 December 2010. 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-dat
7、e lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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
8、under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Fran
9、ce, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR
10、 NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 27020:2010: ELicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy, (c) BSI
11、BS EN ISO 27020:2010EN ISO 27020:2010 (E) 3 Foreword This document (EN ISO 27020:2010) has been prepared by Technical Committee ISO/TC 106 “Dentistry“ in collaboration with Technical Committee CEN/TC 55 “Dentistry” the secretariat of which is held by DIN. This European Standard shall be given the st
12、atus of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2011, and conflicting national standards shall be withdrawn at the latest by June 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject
13、 of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulga
14、ria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice
15、The text of ISO 27020:2010 has been approved by CEN as a EN ISO 27020:2010 without any modification. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy, (c) BSIBS EN ISO 27020:2010ISO 27020:2010(E) ISO 2010 All rights reserved iiiForeword ISO (the Internationa
16、l 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 interested in a subject for which a technical committee has been es
17、tablished has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardi
18、zation. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for vot
19、ing. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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 responsible for identifying any or all suc
20、h patent rights. ISO 27020 was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee SC 1, Filling and restorative materials. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy, (c) BSIBS EN ISO 27020:2010ISO 27020:2010(E) iv ISO 2010 All rights
21、reservedIntroduction This International Standard has been developed as a result of the difficulty often encountered by clinicians to make meaningful comparisons between brackets and tubes using the information currently available from manufacturers and suppliers. Licensed Copy: Wang Bin, ISO/EXCHANG
22、E CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy, (c) BSIBS EN ISO 27020:2010INTERNATIONAL STANDARD ISO 27020:2010(E) ISO 2010 All rights reserved 1Dentistry Brackets and tubes for use in orthodontics 1 Scope This International Standard is applicable to brackets and tubes for use in fixed orth
23、odontic appliances. This International Standard gives details of methods to compare the functional dimensions of orthodontic brackets and tubes, the test methods by which they can be determined, as well as packaging and labelling information. This International Standard does not specify specific qua
24、litative and quantitative requirements for freedom from biological hazards; which are covered in ISO 10993-1 and ISO 7405. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undat
25、ed references, the latest edition of the referenced document (including any amendments) applies. ISO 1942, Dentistry Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 1942 and the following apply. 3.1 angle of torque occlusal-gingival angle
26、formed between the intersection of the line perpendicular to the tangent to the tooth side surface of the base and the line bisecting the slot in the occlusal-gingival direction, when viewed along the mesial-distal long-axis of the slot NOTE If the angle is oriented toward the occlusal (gingival), i
27、t is designated as positive (negative). See Figure 1. 3.2 angulation angle between the line perpendicular to the mesial-distal long-axis of the slot and the central occlusal-gingival axis of the bracket/tube, when viewed from the buccal/labial NOTE The angulation is positive (negative) when the ging
28、ival part of the central occlusal-gingival axis is inclined toward the distal (mesial) relative to the line perpendicular to the mesial-distal long-axis of the slot. See Figure 2. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy, (c) BSIBS EN ISO 27020:2010I
29、SO 27020:2010(E) 2 ISO 2010 All rights reserved3.3 archwire wire that is formed approximately to the shape of the dental arch 3.4 auxiliary slot additional opening in the bracket or tube for insertion of auxiliary elements 3.5 auxiliary slot dimensions diameter/cross-sectional dimensions of the larg
30、est wire that passes through an auxiliary slot 3.6 band structural annular component affixed to the outer circumference of the crown of a tooth and to which a bracket or tube can be attached 3.7 base part of the bracket or the tube that is attached to the enamel or band 3.8 descriptor code to identi
31、fy the nominal slot height in thousandths of an inch without unit designation, in accordance with accepted orthodontic practice (e.g. 18 or 22) 3.9 bracket tube structural unit attached to a band or base that is capable of retaining an archwire 3.10 in-out 3.10.1 bracket in-out lidistance between th
32、e floor of the slot and the tooth side surface of the base along the intersection of the plane perpendicular to mesial-distal long-axis of the slot in the centre of the bracket slot and the plane bisecting the slot in the occlusal-gingival direction, when viewed along the mesial-distal long-axis of
33、the slot See Figure 3 a). 3.10.2 tube in-out lidistance between the floor of the slot and the tooth side surface of the base, at the mesial end of the tube and in the midplane of the slot in the occlusal-gingival direction; for tubes with a mesial chamfer, the in-out is the distance at the mesial en
34、d of the tube between that part of the floor of the slot in contact with the largest dimension of an archwire (round wire for a round tube and a rectangular wire for a rectangular tube) able to pass the entire tube, and the tooth side surface of the base in the midplane of the slot in the occlusal-g
35、ingival direction, when viewed from the gingival See Figure 3 b). Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy, (c) BSIBS EN ISO 27020:2010ISO 27020:2010(E) ISO 2010 All rights reserved 33.11 rotational offset angle between a line parallel to the floor o
36、f the slot and the line connecting the points of intersection of the lines along the mesial and distal end-faces of the slot at the tooth side surface of the base, when viewed from the occlusal NOTE When the distal (mesial) part of the floor of the slot is furthest from the tooth it is known as a di
37、stal (mesial) offset. See Figure 4. 3.12 slot mesial-distal oriented opening in a bracket or tube primarily to contain an archwire 3.13 slot depth d minimum buccal-lingual dimension of a rectangle where the projection of its buccal/labial side is tangent to the shorter side of the intended slot, whe
38、n viewed along the mesial-distal axis of the slot See Figure 5. 3.14 slot height h maximum occlusal-gingival dimension of a rectangle that is fully engaged in the slot, when viewed along the mesial-distal long-axis of the slot See Figure 5. 3.15 slot length lssmallest mesial-distal dimension of the
39、slot between the mesial and distal ends of the slot 4 Requirements 4.1 Hazardous elements For the purposes of this International Standard, cadmium, beryllium, lead and nickel are designated to be hazardous elements and the manufacturer shall state the concentrations as a mass fraction expressed as a
40、 percentage. 4.2 Measurement of dimensions 4.2.1 The following dimensions shall be recorded to the nearest 0,01 mm. When determined in accordance with Clause 5, the following dimensions of the product shall comply with the ranges stated by the manufacturer: a) in-out lib) slot depth d c) slot height
41、 h d) slot length lse) dimensions of each auxiliary slot. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy, (c) BSIBS EN ISO 27020:2010ISO 27020:2010(E) 4 ISO 2010 All rights reserved4.2.2 The following angles shall be recorded to the nearest 1. When determi
42、ned according to Clause 5, the following angles of the product shall comply with the ranges stated by the manufacturer: a) angle of torque b) angulation c) the rotational offset 5 Test methods 5.1 Sampling Six specimens of a single product from one batch shall be procured for each test. Measurements
43、 shall be made on each dimension listed in 4.2 of each sample. 5.2 Dimensions 5.2.1 Apparatus Measurements shall be taken with callipers, micrometers, optical comparators, or other devices with an accuracy of 0,005 mm or 0,5. 5.2.2 Measurement procedures 5.2.2.1 Angle of torque (see Figure 1) 5.2.2.
44、1.1 When viewed from the labial/buccal, perform the following. a) Construct a line along the mesial-distal long-axis of the slot (X-axis). b) Construct plane 1 (see AA in Figure 1) perpendicular to the X-axis in the centre of the slot (depicted by the symbol ). 5.2.2.1.2 When viewed in plane 1, perf
45、orm the following in plane 1. a) Construct line 2 bisecting the slot in the occlusal-gingival direction. b) At the point of intersection of the tooth side surface of the base and line 2 (point 3 in Figure 1), construct line 4 tangent to the tooth side surface of the base. c) Construct line 5 perpend
46、icular to line 4 (depicted by the symbol ) passing through point 3. d) Measure the angle of torque, , between line 5 and line 2. A suggested method is to view along the mesial-distal long-axis of the slot (X-axis) of the bracket or tube and place a convex radius template in plane 1 of the bracket or
47、 tube, against the tooth side surface of the base, thus constructing the tooth side surface of the base. Then construct lines 2, 4 and 5 as defined above. Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy, (c) BSIBS EN ISO 27020:2010ISO 27020:2010(E) ISO 2010
48、 All rights reserved 5a) Angle of torque in-face b) Angle of torque in-base Key X mesial-distal long-axis of the slot 1 plane perpendicular to the X-axis in the centre of the slot 2 line bisecting the slot in the occlusal-gingival direction 3 point of intersection of line 2 to the tooth side surface
49、 of the base 4 line tangent to the tooth side surface of the base passing through point 3 5 line perpendicular to line 4 passing through point 3 angle of torque Figure 1 Angle of torque of the bracket or tube Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 21/04/2011 04:05, Uncontrolled Copy, (c) BSIBS EN ISO 27020:2010ISO 27020:2010(E) 6 ISO 2010 All rights reserved5.2.2.2 Angulation (see Figure 2) Viewing from the labial/buccal, perform the following. a) Construct a line along the mesial-distal long-axis of the
