Dentistry - Digitizing devices for CAD/CAM systems for indirect dental restorations - Test methods for assessing accuracy (ISO 12836:2015)

ISO 12836:2015 specifies test methods for the assessment of the accuracy of digitizing devices for computer-aided design/computer-aided manufacturing (CAD/CAM) systems for indirect dental restorations. The methods described in ISO 12836:2015 require a digitizing device in which the object is mounted relative to the optical or mechanical-contact system and therefore do not apply to hand-held scanning devices.
These test methods are not applicable to digitization by radiographic (X-ray) methods or by magnetic resonance imaging (MRI) methods.

Zahnheilkunde - Digitalisierungsgeräte für CAD/CAM-Systeme für indirekte dentale Restaurationen - Prüfverfahren zur Beurteilung der Genauigkeit (ISO 12836:2015)

Médecine bucco-dentaire - Dispositifs de numérisation des systèmes de CFAO pour restaurations dentaires - Méthodes d'essai pour l'évaluation de l'exactitude (ISO 12836:2015)

L'ISO 12836:2015 spécifie les méthodes d'essai permettant d'évaluer l'exactitude des dispositifs de numérisation des systèmes de Conception Assistée par Ordinateur/Fabrication Assistée par Ordinateur (CFAO) pour la restauration dentaire indirecte. Les méthodes décrites dans l'ISO 12836:2015 requièrent un dispositif de numérisation dans lequel l'objet est installé par rapport au système optique ou à contact mécanique, et ne s'appliquent donc pas aux dispositifs de balayage manuels.
Ces méthodes d'essai ne s'appliquent pas à la numérisation par radiographie (rayons X) ou par imagerie par résonance magnétique (IRM).

Zobozdravstvo - Pripomočki za za uporabo sistemov CAD/CAM za posredne zobne preureditve - Preskusne metode za ugotavljanje točnosti (ISO 12836:2015)

Ta mednarodni standard določa preskusne metode za ugotavljanje točnosti digitalnih pripomočkov za računalniško podprte sisteme načrtovanja/proizvodnje (CAD/CAM) za posredne zobne preureditve. Metode, opisane v tem mednarodnem standardu, potrebujejo digitalni pripomoček, v katerem je predmet nameščen ustrezno glede na optični sistem ali sistem z mehanskim stikom, in se zato ne uporabljajo za ročne pripomočke za skeniranje.
Te preskusne metode se ne uporabljajo za digitalizacijo z radiografskimi (rentgenskimi) metodami ali metodami slikanja z magnetno resonanco (MRI).

General Information

Status
Published
Publication Date
14-Jul-2015
Technical Committee
Drafting Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
15-Jul-2015
Completion Date
15-Jul-2015

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SLOVENSKI STANDARD
SIST EN ISO 12836:2015
01-oktober-2015
1DGRPHãþD
SIST EN ISO 12836:2012
=RER]GUDYVWYR3ULSRPRþNL]D]DXSRUDERVLVWHPRY&$'&$0]DSRVUHGQH]REQH
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Dentistry - Digitizing devices for CAD/CAM systems for indirect dental restorations - Test

methods for assessing accuracy (ISO 12836:2015)
Zahnheilkunde - Digitalisierungsgeräte für CAD/CAM-Systeme für indirekte dentale
Restaurationen - Prüfverfahren zur Beurteilung der Genauigkeit (ISO 12836:2015)
Médecine bucco-dentaire - Dispositifs de numérisation des systèmes de CFAO pour

restaurations dentaires - Méthodes d'essai pour l'évaluation de l'exactitude (ISO

12836:2015)
Ta slovenski standard je istoveten z: EN ISO 12836:2015
ICS:
11.060.01 Zobozdravstvo na splošno Dentistry in general
35.240.80 Uporabniške rešitve IT v IT applications in health care
zdravstveni tehniki technology
SIST EN ISO 12836:2015 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 12836:2015
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SIST EN ISO 12836:2015
EUROPEAN STANDARD
EN ISO 12836
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2015
ICS 11.060.01 Supersedes EN ISO 12836:2012
English Version
Dentistry - Digitizing devices for CAD/CAM systems for indirect
dental restorations - Test methods for assessing accuracy (ISO
12836:2015)

Médecine bucco-dentaire - Dispositifs de numérisation des Zahnheilkunde - Digitalisierungsgeräte für CAD/CAM-

systèmes de CFAO pour restaurations dentaires - Systeme für indirekte dentale Restaurationen -

Méthodes d'essai pour l'évaluation de l'exactitude (ISO Prüfverfahren zur Beurteilung der Genauigkeit (ISO

12836:2015) 12836:2015)
This European Standard was approved by CEN on 7 May 2015.

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-date 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

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12836:2015 E

worldwide for CEN national Members.
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SIST EN ISO 12836:2015
EN ISO 12836:2015 (E)
Contents Page

European foreword .............................................................................................................................................3

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SIST EN ISO 12836:2015
EN ISO 12836:2015 (E)
European foreword

This document (EN ISO 12836:2015) 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 status of a national standard, either by publication of an identical

text or by endorsement, at the latest by January 2016, and conflicting national standards shall be withdrawn at

the latest by January 2016.

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 ISO 12836:2012.

According to the CEN-CENELEC 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,

Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

Endorsement notice

The text of ISO 12836:2015 has been approved by CEN as EN ISO 12836:2015 without any modification.

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SIST EN ISO 12836:2015
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SIST EN ISO 12836:2015
INTERNATIONAL ISO
STANDARD 12836
Second edition
2015-07-01
Dentistry — Digitizing devices for
CAD/CAM systems for indirect dental
restorations — Test methods for
assessing accuracy
Médecine bucco-dentaire — Dispositifs de numérisation des systèmes
de CFAO pour restaurations dentaires — Méthodes d’essai pour
l’évaluation de l’exactitude
Reference number
ISO 12836:2015(E)
ISO 2015
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SIST EN ISO 12836:2015
ISO 12836:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
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SIST EN ISO 12836:2015
ISO 12836:2015(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Requirements .......................................................................................................................................................................................................... 4

4.1 General ........................................................................................................................................................................................................... 4

4.2 Accuracy ........................................................................................................................................................................................................ 4

5 Test methods ............................................................................................................................................................................................................. 5

5.1 General ........................................................................................................................................................................................................... 5

5.2 Test conditions ........................................................................................................................................................................................ 5

5.3 Accuracy ........................................................................................................................................................................................................ 5

5.3.1 Repeatability ....................................................................................................................................................................... 5

5.3.2 Reproducibility .................................................................................................................................................................. 5

5.3.3 Trueness .................................................................................................................................................................................. 5

6 Test report ................................................................................................................................................................................................................... 5

Annex A (normative) Inlay-cavity die .................................................................................................................................................................. 7

Annex B (normative) Crown-and-bridge preparation die ..........................................................................................................11

Annex C (normative) Sphere ......................................................................................................................................................................................16

Bibliography .............................................................................................................................................................................................................................19

© ISO 2015 – All rights reserved iii
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SIST EN ISO 12836:2015
ISO 12836:2015(E)
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. Each 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, 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 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 documents 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 responsible 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 the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 106, Dentistry, Subcommittee SC 9, Dental

CAD/CAM systems.

This second edition cancels and replaces the first edition (ISO 12836:2012), of which it constitutes a

minor revision.
iv © ISO 2015 – All rights reserved
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SIST EN ISO 12836:2015
ISO 12836:2015(E)
Introduction

The application of dental computer-aided design and manufacturing (CAD/CAM) systems is increasing

throughout the world.

This International Standard specifies three test methods for assessing the accuracy of dental digitizing

devices used for CAD/CAM systems.

This International Standard is based on the premise that only the matched point cloud and the resulting

tessellation thereof conforming to the StereoLithography Interface Specification (also known as

Standard Tesselation Language or STL) be regarded as the product of scanning the physical object.

This International Standard includes the measurement of the image that is digitized from dental scanners

(lab-based optical scanners and lab-based mechanical contact scanners). Digitized images are not only

used for the fabrication of restorative products but also applied to teaching and research in dentistry, in

such areas as occlusion, tooth and gingival contour change measurements, and so forth.

It was felt that, besides the sphere, more physical objects are required, for example, a surface with an

inlay-shaped cavity with a sharp edge to simulate the edge of an inlay preparation. When no means (for

example, software algorithm) are available to calculate a standard deviation of discrepancies between

the points of the point cloud or STL surface and the physical object’s surface as a measure for accuracy,

some software is required to match the CAD STL format file of the physical object with the point cloud

or STL surface and visualize discrepancies, resulting in a qualitative assessment.

The following three specimens (two dental and one technical), which are specified in Annex A, Annex B,

and Annex C, can be used for assessing digitizing devices:
a) specimen shaped to simulate a cavity for an inlay;

b) multi-unit specimen, consisting of two core dies for coverage by a full crown with a centre-to-centre

distance of 30 mm, being designed to simulate digitizing a four-unit bridge;

c) a sphere, the measurement of which is limited to the hemisphere lying above the horizontal plane.

ISO 5725-1 uses two terms, “trueness” and “precision”, to describe the accuracy of a measurement

method. “Trueness” refers to the closeness of agreement between the arithmetic mean of a large number

of test results and the true or accepted value. “Precision” refers to the closeness of agreement between

test results. The general term “accuracy” is used to refer to both trueness and precision.

© ISO 2015 – All rights reserved v
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SIST EN ISO 12836:2015
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SIST EN ISO 12836:2015
INTERNATIONAL STANDARD ISO 12836:2015(E)
Dentistry — Digitizing devices for CAD/CAM systems
for indirect dental restorations — Test methods for
assessing accuracy
1 Scope

This International Standard specifies test methods for the assessment of the accuracy of digitizing

devices for computer-aided design/computer-aided manufacturing (CAD/CAM) systems for indirect

dental restorations. The methods described in this International Standard require a digitizing device in

which the object is mounted relative to the optical or mechanical-contact system and therefore do not

apply to hand-held scanning devices.

These test methods are not applicable to digitization by radiographic (X-ray) methods or by magnetic

resonance imaging (MRI) methods.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 554, Standard atmospheres for conditioning and/or testing — Specifications
ISO 1942, Dentistry — Vocabulary
ISO 3290-2, Rolling bearings — Balls — Part 2: Ceramic balls

ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results — Part 1: General

principles and definitions

ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts and associated

terms (VIM)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 1942, ISO 5725-1, ISO Guide 99,

and the following apply.
3.1
accuracy

〈measurement〉 closeness of agreement between a result of a measurement and a true value of the measurand

Note 1 to entry: Accuracy is a qualitative concept. See 3.8 and 3.17 for quantification of its two constituent

components: precision and trueness.
[SOURCE: ISO 5725-1:1994, 3.6, modified]
3.2
calibration

set of operations that establish, under specified conditions, the relationship between values of quantities

indicated by a measuring instrument or measuring system or values represented by a material measure

or a reference material and the corresponding values realized by standards
© ISO 2015 – All rights reserved 1
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SIST EN ISO 12836:2015
ISO 12836:2015(E)
3.3
digitizing device
dental surface data acquisition device

device for computer-aided design and manufacturing of custom-made indirect dental restorations

used to record the topographical characteristics of teeth and surrounding tissues, implant connecting

components, dental impressions, dental moulds, or stone models by analogue or digital methods

Note 1 to entry: These systems consist of a scanning device, hardware and software.

Note 2 to entry: A surface digitization procedure starts with the generation of actually measured surface points

(or their conversion, for example, in STL format), which are the measured digitization data. In most digitizing

systems, the measured points are mathematically processed by operations such as:
— matching;
— filtering;
— weighing;
— selective removal;
— smoothing, etc.

This results in the processed digitization data (or surface data). These data depend very much on, for example, the

digitization protocol (for example, the number of passes), the extraction method of a surface from the raw data

points, and the matching of point clouds.
3.4
error
〈measurement〉 result of a measurement minus a true value of the measurand

Note 1 to entry: When it is necessary to distinguish “error” from “relative error”, the former is sometimes called

“absolute trueness”.
Note 2 to entry: In many instances, the trueness is called “total error”.
3.5
indirect dental restoration

any kind of restoration manufactured extraorally which replaces intra-oral hard and/or soft tissues

EXAMPLE Crowns, bridges, inlays, implant superstructures, prostheses, provisional restorations.

Note 1 to entry: Epitheses that involve the oral cavity are included; devices for short-term use, for example,

surgical guides, are excluded.
3.6
measurand
particular quantity subject to measurement
3.7
measurement procedure

set of operations which are specifically used in the performance of particular measurements according

to a given technique

Note 1 to entry: In a quality system, a measurement procedure is recorded as a working instructions document

and should be described in sufficient detail to enable an operator to carry out a measurement without

additional information.
3.8
precision

closeness of agreement between independent results of measurement obtained under stipulated conditions

Note 1 to entry: Precision is a qualitative concept. The operational definition that applies in this International

Standard is the standard deviation described in 5.3.2.
2 © ISO 2015 – All rights reserved
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SIST EN ISO 12836:2015
ISO 12836:2015(E)
[SOURCE: ISO 5725-1:1994, 3.12, modified]
3.9
random error

result of a measurement minus the mean that would result from an infinite number of measurements of

the same measurand carried out under repeatable conditions
Note 1 to entry: Random error is equal to trueness minus systematic error.

Note 2 to entry: In practice, random error may be estimated from 20 or more repeated measurements of a

measurand under specified conditions.
3.10
relative error
trueness divided by a true value of the measurand
3.11
repeatability

〈results of measurements〉 closeness of the agreement between the results of successive measurements

of the same measurand carried out under the same conditions of measurement

Note 1 to entry: Repeatability is a qualitative concept. Its quantitative counterpart is standard deviation of

repeatability or coefficient of variation of repeatability of the measurement results.

Note 2 to entry: Repeatability may depend on the value of the measurand.
3.12
repeatability conditions

conditions where independent results of measurements are obtained with the same measurement

procedure in the same laboratory by the same operator using the same equipment within short intervals

of time without new calibration
[SOURCE: ISO 5725-1:1994, 3.14, modified]
3.13
reproducibility
results of measurements

closeness of the agreement between the results of measurements of the same measurand carried out

under changed conditions of measurement

Note 1 to entry: The changed conditions may include principle of measurement, method of measurement, observer,

measuring instrument, reference standard, location, conditions of use, and time.

Note 2 to entry: The set of specified conditions is termed “reproducibility conditions”.

Note 3 to entry: Reproducibility is a qualitative concept. Its quantitative counterpart is standard deviation of

reproducibility or coefficient of variation of reproducibility of the measurement results.

Note 4 to entry: Reproducibility may depend on the value of the measurand.
3.14
reproducibility conditions

conditions where results of measurements are obtained on the same measurand under different

conditions in different laboratories
Note 1 to entry: The differences in conditions are intended to be specified.
[SOURCE: ISO 5725-1:1994, 3.18, modified]
© ISO 2015 – All rights reserved 3
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SIST EN ISO 12836:2015
ISO 12836:2015(E)
3.15
systematic error

mean that would result from an infinite number of measurements of the same measurand carried out

under repeatable conditions minus a true value of the measurand

Note 1 to entry: Systematic error is equal to error of measurement minus random error.

Note 2 to entry: Systematic error may be constant or proportional to the value of the measurand.

Note 3 to entry: In practice, systematic error is estimated from 20 or more repeated measurements of a measurand

under specified conditions.
3.16
true value
of a quantity
value consistent with the definition of a given particular quantity

Note 1 to entry: This is a value that would be obtained by a perfect measurement. True values are, by nature,

indeterminate.

Note 2 to entry: The indefinite article “a”, rather than the definite article “the”, is used in conjunction with “true

value” because there may be many values consistent with the definition of a given particular quantity.

Note 3 to entry: A reference data set obtained by the procedures of A.4.2 or B.4.2 is used as a true value in A.6.2 or

B.6.2. Dimensions described in C.4 are used as a true value in C.6.2.

Note 4 to entry: The magnitude of an angle or a dimension of a test object described in A.4.1 or B.4.1 obtained

by an independent method of measurement may be taken as a true value, provided that the object has been

manufactured in a process qualified and calibrated to the precision specified in A.4.1 or B.4.1.

3.17
trueness

closeness of agreement between the mean obtained from repeated measurements and a true value or a

conventional true value

Note 1 to entry: Trueness is a qualitative concept. The operational definition that applies for this International

Standard is given in 5.3.3.
[SOURCE: ISO 5725-1:1994, 3.7, modified]
4 Requirements
4.1 General

The manufacturer of the digitizing device shall provide product-specific information including

instructions for use.

The digitization device shall be driven by software recommended by the supplier or manufacturer for

digitization and rendering of the scanned physical object surface.
4.2 Accuracy

The manufacturer of the digitizing device shall provide product-specific information on the accuracy

(trueness and precision) of the digitizing device (e.g. a description of the tested object) in the

instructions for use.

In order to determine the quality of a digitizing device in terms of accuracy, repeatability, and

reproducibility, known physical objects shall be analysed for structures that are important for the

purpose of generating indirect dental restorations. The manufacturer of the digitizing device shall

report on the tests carried out, for example, in the instructions for use.
4 © ISO 2015 – All rights reserved
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SIST EN ISO 12836:2015
ISO 12836:2015(E)

From the assessment performed with the test specimens specified in Annex A, Annex B, or Annex C, the

manufacturer shall derive comprehensive documentation.
The test procedure used shall be reported.

EXAMPLE “Tested in accordance with ISO 12836:2012, Annex A, Inlay-shaped specimen.”

5 Test methods
5.1 General
Use at least two of the test methods described in Annex A, Annex B, and Annex C.
5.2 Test conditions
Testing shall be done under the following test conditions:
a) the change of temperature during the test shall remain within ±1 °C;
b) the ambient room temperature shall be (23 ± 2) °C in accordance with ISO 554;

c) the quality of the data set in terms of any missing or corrupted data shall be evaluated by the

operator; in cases of missing or corrupted data, the test shall be repeated.
5.3 Accuracy
5.3.1 Repeatability

Repeat the measurement 30 times without removing the test specimen from the digitizing device. Use

the test specimen and procedures specified in Annex A, Annex B, or Annex C as recommended in the

manufacturer’s instructions for use. Calculate the mean and standard deviation of the 30 measurements.

Record this value(s).
5.3.2 Reproducibility

Repeat the measurement 30 times, removing the test specimen from the digitizing device and replacing

it into the digitizing device. Use the test specimen and procedures specified in Annex A, Annex B, or

Annex C as recommended in the manufacturer’s instructions for use. Calculate the mean and standard

deviation of the 30 measurements. Record this value(s).
5.3.3 Trueness

Calculate the difference between the mean of the 30 repeatability measurements and a true value

obtained independently according to the respective annex. (See A.6.2, B.6.2, or C.6.2).

6 Test report

Prepare a written test report. The test report shall contain at least the following information:

a) a reference to this International Standard, i.e. ISO 12836:2015;
b) a reference to the annexes of this International Standard used for testing;

c) identification of the test specimen (i.e. inlay-shaped specimen, crown-shaped specimen, bridge-

shaped specimen, sphere specimen);
d) specimen surface preparation;
© ISO 2015 – All rights reserved 5
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SIST EN ISO 12836:2015
ISO 12836:2015(E)

e) test conditions, including the number of scanning views manually matched, if it is necessary

according to the measurement procedure as specified in the manufacturer’s instructions;

f) trueness;

g) mean and standard deviation for repeatability and reproducibility of measurement;

h) software and the version of the software used for assessment;
i) full identification and qualifications of the person who performed the test;
j) full documentation of the conditions used during reproducibility testing.

In addition, the following information shall be included for tests made in accordance with Annex C:

— number of measured points;
— histogram distribution of points;
— mean radius, R ;
— minimum and maximum radius;
— radius deviation.
6 © ISO 2015 – All rights reserved
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SIST EN ISO 12836:2015
ISO 12836:2015(E)
Annex A
(normative)
Inlay-cavity die
A.1 General

This annex specifies the measurement of a die which simulates an inlay-cavity. This test procedure uses

a negative geometry.
A.2 Principle

An inlay-cavity die is first measured with a reference measurement system in order to produce a

reference data set (calibration of the measurement object).

Then, the digitizing device under investigation is used to capture the inlay-shaped physical object. The

resulting measurement data are compared to the reference data set.
A.3 Apparatus

A.3.1 Test specimen, in the form of an inlay-shaped physical object, as specified in Figure A.1. The

mater
...

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