Working toward the international standardizationof dental magnetic attachments- Commission report of the ISO Corresponding Committee in 2017 Y. Takada
Chairman of the ISO corresponding committee
Division of Dental Biomaterials, Tohoku University Graduate School of Dentistry

Introduction
The international standardization of dental magnetic attachments started by submitting NP (NewBusiness Item Proposal) at the ISO/ TC 106 (Berlin meeting) in 2007 and proceeded officially fromthe ISO/ TC 106 (Gothenburg meeting) in 2008.1) Four years later, the international standard ISO
13017 for dental magnetic attachment was established in July 2012. 2)
Since ISO 13017 standard included some insufficient parts such as retentive force and so on becauseof its short-term formulation, the necessity of an amendment for ISO 13017 was suggested byJapanese members at the ISO/ TC 106 (Paris meeting) held in September 2012.
The suggestion was passed by NP voting in the following year and a draft of the amendment for ISO
13017 had been formulated.3) After three years discussion, international standardization of retentive
force measurement method was established as ISO 13017: 2012/ Amd. 1 (Amendment of ISO13017) in November 2015. 4)
It took finally over nine years to complete the ISO standards that can unfailingly demonstrate themerits of Japanese dental magnetic attachments that are compact, lightweight and have a large
retentive force. Although the completion of the standards gave a halt of holding the SC 2/ WG 22
meeting at the ISO/ TC 106 (Tromsø meeting) in 2016, the WG 22 meeting in Hong Kong took
place as the periodic revision of ISO 13017 in 2017.
This article outlines the state of the Hong Kong meeting in 2017 and the concept of ISO 13017
integrated with its amendment.

Activities
The completion of the standard gave a halt of holding the SC 2/ WG 22 meeting at the ISO/ TC 106(Tromsø meeting) in 2016. Meanwhile, the ISO Corresponding Committee has formulated a revised
version of the standard which is composed of the integration of ISO 13017 and ISO 13017: 2012/
Amd.1. The revised version was sent to SC 2 secretariat at early April, and the revised version wassubjected to NP voting at end of June in 2017.
As a result, it was passed as a new business (Approval number: 14), the number of P member
countries who agreed with the deliberation from the DIS stage (Draft of International Standard: stage40.00) was 5. However, SC 2 secretariat recommended to deliberate from WD (Stage 20.00) because
the number of P member countries who agreed with deliberations from WD (Stage 20.00 to 20.20)
became 9. (Table 1)Table 1

Result of the NP voting at the end of June 2017

As the comments of each country submitted at the time of NP voting, the answers were prepared andthe modified WD was submitted to the SC2 secretariat in early August. The secretariat officiallypresented that it will formulate standards from WD (stage 20.00) over a three-year period. (Fig. 1)
Since the standard has to reach to publishment (stage 60.60) in three years, we decided to aim for thepassing of DIS entry (stage 40.00) at this Hong Kong meeting.

Fig.1

Results instructed by SC2 Secretariat

Working goal in 2017
The aim is decided to pass of DIS entry (stage 40.00) at this Hong Kong meeting.

ISO/TC 106 Hong Kong meeting
Six members of the ISO Corresponding Committee, Dr. S. Masumi (convener),Dr. T. Ishigami (expert), Dr. Y. Takada (expert assistant), Dr. M. Takahashi (obsever), Dr. E.
Makihara (obsever), Dr. H. Sasaki (obsever) and Dr. Kent T. Ochiai (convener assistant) of an
Aameican member, attended the ISO/TC 106 Hong Kong meeting held at Hong Kong University in
20-26 August, 2017.(Fig. 2)

Fig.2

Hong Kong University and Its position indicated on the map

The SC2/ WG22 meeting scheduled on August 23 was canceled on the unprecedented typhoon(Level 8) which was attacking Hong Kong and Macau from the previous day. (Fig. 3)

Fig. 3Typhoon view from the hotel window

As the emergency plan for rescheduled WG meeting was informed in midnight on August 24, ourmembers got the opportunity to propose deliberations from DIS entry at the SC 2/ WG 22 meetingon next day morning. (Fig. 4)

Fig.4

Emergency plan for rescheduled WG meetings at 3:12 am on 24 Aug.

Although the meeting from 10 a.m. was as chaotic as the weather, the nice wind seemed to blow tothe Japanese side. We were able to obtain approval with almost Japanese proposal except for somemodifications. The deliberation from DIS stage was also passed by WG 22 and SC 2 plenary. (Fig.5)

Fig. 5

SC2/ WG 22 meeting and SC2 plenary

Currently, the revised draft was accepted by SC2 Secretariat on 24th October in 2017, and it isscheduled to be subject to DIS voting early next year.
Pleasure in Hong Kong such as dinner party of ISO/TC 106 and excellent night view are shown inFig. 6.

Fig.6

Pleasure in Hong Kong

Overview of ISO 13017 integrated with ISO 13017: 2012/ Amd.1
The overview of ISO 13017 integrated with ISO 13017: 2012/ Amd.1 is shown in Table 2. ISO
13017 consists of clauses 1 to 8, and it is reinforced by the addition and revise of the clause 5 (5.1Retentive force) and the clause 6 (6.3 Retentive force, 6.4 Corrosion resistance) according to theamendment (Amd. 1). (See underlines in Table 2)

The pretreatment of specimens was specified in the clause 5. Concretely, “Cleaning protocol” of thespecimens for measuring retentive force was added to the sub-clause 5.1.
The clause 6 specified the test methods for evaluating that the magnetic attachment shall satisfy therequirements stated in the clause 4. Mainly specifies methods for measuring magnetic flux leakage,retentive force, and corrosion resistance.
The amendment (Amd. 1) enhanced the measuring method of retentive force in detail, making it
possible to perform accurate and reproducible measurements. In particular, the measurement
assisting device was specified to move vertically to the mating face, regulating the dynamic friction
force within 0.01 N (1 g).
Furthermore, the retentive force curve obtained by the attractive force measurement is specified inorder to clarify how to obtain the retentive force, and the difference between the measurement value
and the baseline was defined as the true maintenance force.
Corrosion resistance in the clause 6.1 introduced the determination limit and the detection limit usedin chemical analysis method in order to clarify the quantitative analysis of impurity element ions inthe static immersion test.
Table 2

Overview of ISO 13017 integrated with ISO 13017: 2012/ Amd.1

Finally
The international standardization of dental magnetic attachments, which started in 2005, took 12years to establish international standards, including preparations. As we succeeded in establishing acouple of international standards ISO 13017 and ISO 13017: 2012 / Amd.1 (Amendment edition)
within the scheduled term, we were able to realize an exemplary formulation. We would like to ask
for your continued support and cooperation in the future.
To readers,Thank you very much.
From all members of the ISO corresponding committee in JSMAD

Reference1）Y. Takada. Commission report of the ISO Corresponding Committee, JJ Mag Dent 2011; 20(1):81-85.
2）ISO 13017: 2012(E), Dentistry－Magnetic Attachments.
3）Y. Takada. Commission report of the ISO Corresponding Committee, JJ Mag Dent 2013; 22(1):65-68.
4）ISO 13017：2012(E)/Amd.1, Dentistry－Magnetic Attachments.