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. 2019 Dec 12;5:42. doi: 10.1186/s40729-019-0195-1

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Insertion torque and unscrewing device. Determination of insertion torque of individually hand-tightened smartpegs in test group by recording the removal torque required when unscrewing the device (BTG36N Analog Torque Meter, Tohnichi Manufacturing Co. Ltd., Tokyo, Japan)