EN 28627:1990

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Zahnheilkunde - Härte des Bürstenbereichs bei Zahnbürsten (ISO 8627:1987)Art dentaire - Dureté de la surface garnie des brosses a dents (ISO 8627:1987)Dentistry - Stiffness of tufted area of tooth-brushes (ISO 8627:1987)11.060.20Dental equipmentICS:Ta slovenski standard je istoveten z:EN 28627:1990SIST EN 28627:2000en01-januar-2000SIST EN 28627:2000SLOVENSKI
STANDARD



SIST EN 28627:2000



SIST EN 28627:2000



SIST EN 28627:2000



INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEX,ljYHAPO,QHAfl OPTAHM3A~llfi l-l0 CTAHflAPTM3AL&Wl Dentistry - Stiffness of the tufted area sf tooth-brushes Art den taire - Dureth de Ia surface garnie des brosses 2 dents 8627 First edition 1987-10-01 Reference nun-her ISO 8627 : 1987 (E) SIST EN 28627:2000



Foreword ISO (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. Esch 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, govern- mental and non-governmental, in Iiaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 8627 was prepared by Technical Committee ISO/TC 106, Den tis try. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. 0 International Organkation for Standardkation, 1987 Printed in Switzerland SIST EN 28627:2000



INTERNATIQNAL STANDARD Dentistry - Stiffness of tufted area of tooth-brushes 0 Introduction The stiffness of tooth-brushes, determined in accordance with a compromise method based on the BSI method and the FrenchNotwegian methods, was originally classified into five categories. However as a result of collaborative testing between laboratories it was subsequently decided to reduce the number of categories to three. This International Standard specifies a method for determining the stiffness of the tufted area of tooth-brushes and a means of assigning the stiffness so measured into categories of stiffness, i.e. -- soft; - medium; - hard. Classification enables the consumer to choose a brush with the appropriate stiffness for his or her needs. lt is therefore desirable that all manufacturers use the same test methods and categories in Order that the user tan select according to the category and obtain the required stiffness irrespective of brand or country of origin of the brush. At present there tan be con- siderable differentes between identical stiffness gradings as claimed by different manufacturers. This has been recognized and has been accommodated in the elaboration of this Inter- national Standard by allowing for an overlap of stiffness categories for a limited period, the intention being to revise this International Standard in 5 years’ time and replace the existing categories by those shown in the note to clause 6. 1 Scope and field of application This International Standard specifies a test method and grading scheme for the stiffness of the tufted area sf conventional manual tooth-brushes, together with relevant information con- cerning definitions and information concerning testing machines. 2 Def initions For the purposes of this International Standard, the following definitions apply. 2.1 filament : A Single element of a tuft fixed into a brush. 2.2 tufted area, A : The total area of the tuft holes, i.e. the area of one tuft hole multiplied by the number of tuft holes. 2.3 stiffness grade, 6 : The stiffness as measured and calculated according to this International Standard. 2.4 stiffness category : The category, e.g. soft, medium or hard, as defined by the range into which the stiffness grade falls. 2.5 stiffness index : A number relating to the stiffness category. 2.6 filament length, X : The length measured at right angles to the stock from the tip sf the free end of the filament to the Point at which it enters the tuft hole. 2.7 defiection forte : The reaction forte caused by the deflection of the filaments from their normal Position by one- third of the weighted mean filament iength Isee 5.3.3). 2.8 brush stiffness : The reaction forte exerted per unit area of the brush during deflection. 3 Sampling The tooth-brushes used for testing shall be Standard model tooth-brushes. They shall not be altered or adjusted in any way that makes them different from the Standard model manufac- tured. A minimum of five brushes sf each category shall be tested. NOTE --. The sampling method and the means of procurement are not covered by this International Standard and should be subject to agree- ment between the interested Parties. 4 Testing conditions The tests shall be carried out under the following conditions : - dry : 23 + 2 *C and (50 + 5) % relative humidity; - wet : immerse the brushes in water at 23 + 4 “C for 90 s; remove from the water and commence the test 3 min & 15 s after removai. SIST EN 28627:2000



ISO 8627 : 1987 (E) 5 Test method 5.1 Principle Determination of the length of a filament of a tooth-brush followed by the determination of the tufted area of the brush and measurement of the deflection forte. Calculation of the degree of stiffness of the brush from the values obtained. 5.2 Apparatus NOTE - An example of a suitable apparatus is shown in the figure. The apparatus comprises the following elements. ‘) 5.2.1 Gripping unit to grip the brush at right angles to the filaments, which consists mainly of 5.2.1.1 Block in which the head of the brush is fixed. (See the footnote.) 5.2.1.2 Adjustable screw for adjusting and moving the block (521.1). 5.2.1.3 Comparator for measuring the movement of the block (5.2.1.1). NOTE - Micrometer calipers may be used instead of the adjustable screw (5.2.1.21 and comparator. 5.2.2 Apparatus for measuring and indicating the deflect
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